Service Manual2007 Captiva Diagnostic Trouble Code (DTC) P1551

Captiva

Diagnostic Trouble Code (DTC) P1551

DTC Descriptor

DTC P1551 : Throttle Valve Rest Position Not Reached During Learn

Diagnostic Fault Information

Perform the Diagnostic System Check prior to using this diagnostic procedure.

Circuit/System Description

Conditions for Running the DTC

The vehicle speed is 0 km/h (0 mph).
The engine speed is less than 40 RPM.
The engine coolant temperature (ECT) is between 5-85°C (41-185°F).
The intake air temperature (IAT) is between 5-60°C (41-140°F).
The ignition 1 voltage is more than 10 volts.
The accelerator pedal position (APP) is less than 15 percent.
DTC P1551 runs when the throttle actuator control motor is deactivated.

Conditions for Setting the DTC

The ECM detects the TP sensor angle is less than 1.8 percent or more than 13.1 percent for more than 4 seconds, when the throttle actuator control motor is deactivated.

Action Taken When the DTC Sets

DTC P1551 is a type A DTC.

Conditions for Clearing the DTC

DTC P1551 is a type A DTC.

Diagnostic Aids

Operating the throttle valve with the Throttle Position control function of the scan tool may cause additional DTCs to set. DO NOT attempt to diagnose DTCs set during this function.
The scan tool has the ability to operate the throttle actuator control system using Special Functions. This function operates the throttle through the entire range in order to determine if the throttle body and system operate correctly.
Inspect for a condition in which the throttle valve may have been held open.
Inspect for conditions in which ice may have formed in the throttle bore.
The throttle valve is spring loaded to a slightly open position. The throttle valve should be open approximately 3-5 percent. This is referred to as the rest position. The throttle valve should not be completely closed, nor should they be open any more than the specified amount. The throttle valve should move open and to the closed position without binding under the normal spring pressure. The throttle should NOT be free to move open or closed WITHOUT spring pressure.

Circuit/System Verification

Ignition ON, observe the DTC information with a scan tool. Verify that DTCs P0121, P0122, P0123, P0221, P0222, P0223, P2100, P2101, or P2119 are not set.

If any of the above DTCs are also set, refer to the appropriate DTC information for further diagnosis.

Observe the DTC information with a scan tool for 30 seconds.DTC P1551 should not set.
If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

Circuit/System Testing

Ignition OFF, Disconnect the air intake duct at the throttle body and inspect for the following :

Throttle valve that is NOT in the rest position
Throttle valve that is binding open or closed
Throttle valve that is free to move open or closed WITHOUT spring pressure

If a condition is found, replace the throttle body assembly.

Diagnostic Trouble Code (DTC) P1631

DTC Descriptor

DTC P1631 : Theft Deterrent Fuel Enable Signal Not Correct

Diagnostic Fault Information

Perform the Diagnostic System Check prior to using this diagnostic procedure.

Circuit/System Description

The theft deterrent module (TDM) sends the pre-release password to the engine control module (ECM) via the serial data circuit. The ECM then sends a challenge to the TDM. Both the ECM and TDM perform a calculation on this challenge. If the calculated response from the TDM equals the calculation performed by the ECM, the ECM will allow vehicle starting.

Conditions for Running the DTC

Ignition is in the ACC or ON position.

Conditions for Setting the DTC

The ECM receives an incorrect pre–release password from the TDM.

Action Taken When the DTC Sets

DTC P1631 is a type C DTCs.

Conditions for Clearing the DTC

DTC P1631 is a type C DTCs.

Circuit/System Testing

Important : Because of normal system communications between the TDM and ECM, any theft deterrent B-codes must be diagnosed prior to the diagnosis of P-codes.

Perform the Programming Theft Deterrent System Components procedure. The ECM should successfully complete the password learn and the vehicle should start.

If the ECM does not complete the learn or vehicle starting remains disabled, replace the ECM.

Diagnostic Trouble Code (DTC) P1649

DTC Descriptor

DTC P1649 : Theft Deterrent Security Code Not Programmed

Diagnostic Fault Information

Perform the Diagnostic System Check prior to using this diagnostic procedure.

Circuit/System Description

The engine control module (ECM) and the body control module (BCM) are integral part of the vehicle theft deterrent system. The theft deterrent system authenticates the security code programmed into each of these modules to prevent unauthorised vehicle operation. This authentication process includes the following steps:

When the ignition is turned ON or the door is unlocked by remote key the BCM and the key exchange security data to verify the correct key is used.
Once the correct key has been confirmed and the ignition is turned ON, the BCM and ECM exchange data to allow the vehicle to start.
The data exchange processes conducted use various encrypted data exchanges between each of the devices.

Important : If any of these authentication processes fail, the vehicle will not start and DTCs will set. For further information on the theft deterrent system.

An immobiliser signal DTC sets if the theft deterrent system authentication process fails.

Conditions for Running the DTC

Ignition is in the ACC or ON position.

Conditions for Setting the DTC

If the key is not programmed to the BCM then the key authentication will fail and the vehicle will be immobilised.
If the BCM is not linked to the ECM then ECM to BCM authentication will fail and the vehicle will be immobilised.
If the BCM, key or ECM have corrupt memory, then the authentication will fail and the vehicle will be immobilised.
If there is a fault with the GMLAN, no authentication will occur and the vehicle will be immobilised.

Action Taken When the DTC Sets

DTCs P1649 is a type C DTCs.

Conditions for Clearing the MIL/DTC

DTCs P1649 is a type C DTCs.

Diagnostic Aids

Since a fault condition in a wiring connector may trigger DTCs, always test the connectors related to this diagnostic procedure for shorted terminals or poor wiring connections before replacing any component.

The vehicle will allow engine cranking for up to 5 seconds. If the ignition key and BCM do not authenticate the ECM will cease engine cranking or if the engine has started it will stall. Subsequent engine cranking will not initiate unless the ignition is switched OFF for more than 5 seconds.

The "key" referenced in the DTC descriptor does not refer to the vehicle key. In this case "key" is referring to the challenge response.

Circuit/System Testing

Important : Because of normal system communications between the TDM and ECM any theft deterrent B-codes must be diagnosed prior to the diagnosis of P-codes. Perform the Programming Theft Deterrent System Components procedure. The ECM should successfully complete the password learn and the vehicle should start.

If the ECM does not complete the learn or vehicle starting remains disabled, replace the ECM.

Diagnostic Trouble Code (DTC) P1668, P2500, or P2501

DTC Descriptor

DTC P1668 : Generator L-Terminal Control Circuit

DTC P2500 : Generator L-Terminal Circuit Low Voltage

DTC P2501 : Generator L-Terminal Circuit High Voltage

Diagnostic Fault Information

Perform the Diagnostic System Check prior to using this diagnostic procedure.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Alternator L- Terminal Circuit	P0621	P0621	P0621	P0621

Circuit/System Description

The engine control module (ECM) uses the alternator turn ON signal circuit to control the load of the alternator on the engine. A high side driver in the ECM applies a voltage to the voltage regulator. This signals the voltage regulator to turn the field circuit ON and OFF. The ECM monitors the state of the alternator turn ON signal circuit. The ECM should detect low voltage on alternator turn on signal circuit when the ignition is ON and the engine is OFF or when the charging system malfunctions. With the engine running, the ECM should detect high voltage on the alternator turn on signal circuit. The ECM performs key ON and RUN tests to determine the status of the alternator turn on signal circuit.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

With the engine running, the ECM detects low/high compared to a predetermined voltage on the alternator turn on signal circuit for at least 15 seconds.

Action Taken When the DTC Sets

DTCs P1668, P2500 or P2501 are type C store only DTCs.

Conditions for Clearing the MIL/DTC

DTCs P1668, P2500 or P2501 are type C store only DTCs.

Circuit/System Testing

With ignition ON and the engine OFF, disconnect the alternator harness at the alternator and measure the voltage of the alternator turn on signal circuit should read near 0 volts.

If greater than 0 volts test the alternator turn on signal circuit for a short to voltage. If circuit test normal replace the ECM.

With ignition ON and the engine running, the voltage of the alternator turn on signal circuit should read over 3.5 volts.

If no voltage is measured, test the alternator turn on signal circuit for a short to ground an open/high resistance If circuit tests normal replace the ECM.

If all circuits test normal.

Diagnostic Trouble Code (DTC) P2008, P2009, or P2010

DTC Descriptor

DTC P2008 : Intake Manifold Runner Control (IMRC) Solenoid Control Circuit

DTC P2009 : Intake Manifold Runner Control (IMRC) Solenoid Control Circuit Low Voltage

DTC P2010 : Intake Manifold Runner Control (IMRC) Solenoid Control Circuit High Voltage

Diagnostic Fault Information

Perform the Diagnostic System Check prior to using this diagnostic procedure.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Ignition 1 Voltage	P2009¹	P2008	-	-
IMRC Control Circuit	P2009	P2008	P2010	-
¹Opens the fuse that supplies voltage to the IMRC solenoid.

Circuit/System Description

An ignition 1 voltage is supplied directly to the intake manifold runner (IMRC) solenoid. The engine control module (ECM) controls the IMRC solenoid by grounding the control circuit via an internal driver switch. The primary function of the driver is to supply ground for the IMRC solenoid. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the voltage on the control circuit.

Conditions for Running the DTC

The ignition is ON or the engine is operating.
The DTCs run continuously once the above condition is met.

Conditions for Setting the DTC

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for more than 2 seconds.

Action Taken When the DTC Sets

DTCs P2008, P2009, and P2010 are Type E DTCs.

Conditions for Clearing the DTC

DTCs P2008, P2009, and P2010 are Type E DTCs.

Circuit/System Verification

Ignition On, command the IMRC solenoid ON and OFF with a scan tool. You should hear and feel an audible click.
If the vehicle passes the Circuit/System Verification test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the IMRC solenoid.
Ignition ON, test for battery voltage between the ignition 1 voltage circuit of the IMRC solenoid and ground.

If less than B+, repair the ignition 1 voltage circuit of the IMRC solenoid for a short to ground or an open/high resistance. Replace the fuse, if necessary.

Ignition OFF, connect a test lamp between the control circuit and the ignition 1 voltage circuit of the IMRC solenoid.
Ignition ON, command the IMRC solenoid ON with a scan tool. The test lamp should pulse ON and OFF.

If the test lamp remains ON all the time, test for a short to ground on the control circuit. If circuit/connections test normal, replace the ECM.
If the test lamp remains OFF all the time, test for a short to voltage or an open/high resistance on the control circuit. If circuit/connections test normal, replace the ECM.

If all circuits/connections test normal, replace the IMRC solenoid.

Diagnostic Trouble Code (DTC) P2065

DTC Descriptor

DTC P2065 : Fuel Level Sensor 2 Circuit

Diagnostic Fault Information

Perform the Diagnostic System Check prior to using this diagnostic procedure.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Fuel Level Sensor Reference Voltage Circuit	P0462	-	-	P0461
Fuel Level Sensor Signal Circuit	P0462	P0463 1 P0464	P0463	P0461
Fuel Level Sensor Low Reference Circuit	-	P0463 1 P0464	P0463	P0461
Fuel gauge Inaccurate or Inoperative

Circuit/System Description

The fuel level sensor changes resistance in response to the fuel level. The engine control module (ECM) monitors the signal circuit of the fuel level sensor in order to determine the fuel level. When the fuel tank is full, the sensor resistance is low and the ECM senses a low signal voltage. When the fuel tank is empty, the sensor resistance is high and the ECM senses a high signal voltage. The ECM uses the signal circuit of the fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via GMLAN serial data circuit to the instrument cluster in order to control the fuel gauge. The fuel information is also used for misfire and evaporative emission (EVAP) diagnostics.

Conditions for Running the DTC

The ignition is ON, with the engine running.
The system voltage is between 9-16 volts.

Conditions for Setting the DTC

The sender output is less than 0.5 volts.
The above condition is present for greater than 30 seconds.

Action Taken When the DTC Sets

DTC P2065 is a type E DTC.

Conditions for Clearing the DTC

DTC P2065 is a type E DTC.

Circuit/System Verification

Ignition ON, observe the scan tool Fuel Tank Level Remaining parameter. The reading should be between 4 percent and 98 percent.

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the fuel level sensor.
Ignition ON, verify that the scan tool fuel tank level remaining parameter is less than 4 percent.

If greater than 4 percent, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.

If all circuits test normal, replace the fuel level sensor.

Diagnostic Trouble Code (DTC) P2066

DTC Descriptor

DTC P2066 : Fuel Level Sensor 2 Performance

Diagnostic Fault Information

Perform the Diagnostic System Check prior to using this diagnostic procedure.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Fuel Level Sensor Reference Voltage Circuit	P2067	-	-	P2066
Fuel Level Sensor Signal Circuit	P2067	P2068	P2068	P2066
Fuel Level Sensor Low Reference Circuit	-	P2068	P2068	P2066

Circuit/System Description

The fuel level sensor changes resistance in response to the fuel level. The engine control module (ECM) monitors the signal circuit of the fuel level sensor in order to determine the fuel level. When the fuel tank is full the sensor resistance is low and the ECM senses a low signal voltage. When the fuel tank is empty the sensor resistance is high and the ECM senses a high signal voltage. The ECM uses the signal circuit of the fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via GMLAN serial data circuit to the instrument cluster in order to control the fuel gauge. The fuel information is also used for misfire and evaporative emission (EVAP) diagnostics.

This diagnostic tests for a incorrect fuel level sensor signal. The ECM sets this DTC if the fuel level sensor signal appears to be incorrect based on a lack of signal variation expected during normal operation.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

The ECM detects a change in fuel level less than 10 litres (1.3 gallons) over a distance of 241.4 km (150 miles).

Action Taken When the DTC Sets

DTC P2066 is a type E DTC.

Conditions for Clearing the MIL/DTC

DTC P2066 is a type E DTC.

Circuit/System Verfication

Ignition ON, observe the scan tool fuel tank level remaining parameter. The reading should be between 4 percent and 98 percent.

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the fuel level sensor.
Ignition ON, verify that the scan tool fuel tank level remaining parameter is less than 4 percent.

If greater than 4 percent, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.

Ignition ON, install a 3A fusible link wire between the signal circuit and the low reference circuit. Verify the scan tool Fuel tank level remaining parameter is greater than 98 percent.

If less than 98 percent, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

If all circuits test normal, replace the fuel level sensor.

Diagnostic Trouble Code (DTC) P2067

DTC Descriptor

DTC P2067 :Fuel Level Sensor 2 Low Voltage

Diagnostic Fault Information

Perform the Diagnostic System Check prior to using this diagnostic procedure.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Fuel Level Sensor Reference Voltage Circuit	P2067	-	-	P2066
Fuel Level Sensor Signal Circuit	P2067	P2068	P2068	P2066
Fuel Level Sensor Low Reference Circuit	-	P2068	P2068	P2066

Circuit/System Description

The fuel level sensor changes resistance in response to the fuel level. The engine control module (ECM) monitors the signal circuit of the fuel level sensor in order to determine the fuel level. When the fuel tank is full the sensor resistance is low and the ECM senses a low signal voltage. When the fuel tank is empty the sensor resistance is high and the ECM senses a high signal voltage. The ECM uses the signal circuit of the fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via GMLAN serial data circuit to the instrument cluster in order to control the fuel gauge. The fuel information is also used for misfire and evaporative emission (EVAP) diagnostics.

Conditions for Running the DTC

The ignition is ON, with the engine running.
The system voltage is between 9-16 volts.

Conditions for Setting the DTC

The sender output is less than 0.5 volts.
The above condition is present for greater than 30 seconds.

Action Taken When the DTC Sets

DTC P2067 is a type E DTC.

Conditions for Clearing the MIL/DTC

DTC P2067 is a type E DTC.

Circuit/System Verification

Ignition ON, observe the scan tool fuel tank level remaining parameter. The reading should be between 4 percent and 98 percent.

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the fuel level sensor.
Ignition ON, verify that the scan tool fuel tank level remaining parameter is less than 4 percent.

If greater than 4 percent, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.

If all circuits test normal, replace the fuel level sensor.

Diagnostic Trouble Code (DTC) P2068

DTC Descriptor

DTC P2068 :Fuel Level Sensor 2 High Voltage

Diagnostic Fault Information

Perform the Diagnostic System Check prior to using this diagnostic procedure.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Fuel Level Sensor Reference Voltage Circuit	P2067	-	-	P2066
Fuel Level Sensor Signal Circuit	P2067	P2068	P2068	P2066
Fuel Level Sensor Low Reference Circuit	-	P2068	P2068	P2066

Circuit/System Description

The fuel level sensor changes resistance in response to the fuel level. The engine control module (ECM) monitors the signal circuit of the fuel level sensor in order to determine the fuel level. When the fuel tank is full the sensor resistance is low and the ECM senses a low signal voltage. When the fuel tank is empty the sensor resistance is high and the ECM senses a high signal voltage. The ECM uses the signal circuit of the fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via GMLAN serial data circuit to the instrument cluster in order to control the fuel gauge. The fuel information is also used for misfire and evaporative emission (EVAP) diagnostics.

Conditions for Running the DTC

The ignition is ON, with the engine running.
The system voltage is between 9-16 volts.

Conditions for Setting the DTC

The sensor output is greater than 3.5 volts.
The above condition is present for greater than 30 seconds.ds.

Action Taken When the DTC Sets

DTC P2068 is a type E DTC.

Conditions for Clearing the MIL/DTC

DTC P2068 is a type E DTC.

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the fuel level sensor.
Test for less than 1.0 ohm of resistance between the low reference circuit and a known ground.

If greater than 1.0 ohm, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

Ignition ON, install a 3A fusible link wire between the signal circuit and the low reference circuit. Verify the scan tool Fuel tank level remaining parameter is greater than 98 percent.

If less than 98 percent, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

If all circuits test normal, replace the fuel level sensor.

Diagnostic Trouble Code (DTC) P2076, P2077, or P2078

DTC Descriptor

DTC P2076 : Intake manifold Tuning (IMT) Valve Position Sensor performance

DTC P2077 : Intake manifold Tuning (IMT) Valve Position Sensor Circuit Low Voltage

DTC P2078 : Intake manifold Tuning (IMT) Valve Position Sensor Circuit High Voltage

Diagnostic Fault Information

Perform the Diagnostic System Check prior to using this diagnostic procedure.

Inspect the IMRC solenoid valve for witness marks that indicate that the valve was hitting the intake manifold. This condition may be temperature related.
Inspect the manifold runner for any sign of foreign material or excessive dirt build up.

Circuit/System Description

An intake manifold runner control (IMRC) valve is used to change the intake manifold plenum conguration. When the IMRC valve is open, the intake manifold is congured to one large plenum. When the IMRC valve is closed, the intake manifold is configured to 2 smaller plenums. The IMRC valve improves engine performance at low and high engine speeds. Ignition voltage is supplied directly to the IMRC solenoid. The engine control module (ECM) controls the solenoid by grounding the control circuit with a solid state device called a driver. The driver is equipped with a feedback circuit that is pulled up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage.

Conditions for Running the DTC

Condition 1

Engine is running.

Conditions for Setting the DTC

The ECM determines the IMT sensor is out side the expected operating voltages for more than 4 Seconds.

Action Taken When the DTC Sets

DTC P2076, P2077 and P2078 are type E DTCs.

Conditions for Clearing the DTC

DTC P2076, P2077 and P2078 are type E DTCs.

Diagnostic Aids

Inspect the IMRC solenoid valve for witness marks that indicate that the valve was hitting the intake manifold. This condition may be temperature related.

Circuit/System Verification

Start the engine, rapidly move the accelerator pedal from the rest position, to wide open throttle position, back to the rest position. Repeat the procedure a few times. DTC P2111 should not set.
If the vehicle passes the Circuit/System Verification test then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.

Circuit/System Testing

Disconnect the harness connector at the IMT. Connect a test light between the power terminal and the return terminal.
Command the IMT solenoid ON and OFF with a scan tool. Observe the test lamp it should illuminate with each change of state of command circuit.

If test lamp does not illuminate then test the power and return circuits for short to ground or open/high resistance.

If all circuits test normal then replace the ECM.
Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Diagnostic Trouble Code (DTC) P2096 or P2098

DTC Descriptor

DTC P2096 : Post Catalyst Fuel Trim System Low Limit Bank 1

DTC P2098 : Post Catalyst Fuel Trim System Low Limit Bank 2

Diagnostic Fault Information

Perform the Diagnostic System Check prior to using this diagnostic procedure.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
HO2S Signal	P0131, P0137, P2096, P2098	P0134, P0140	P0132, P0138, P2097, P2099	P0133
Low Reference	-	P0134, P0140	P0132, P0138, P2097, P2099	P0133

Circuit/System Description

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air-to-fuel ratio. The control module supplies the HO2S with a reference, or bias voltage of about 450 mV. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0–1,000 mV. This voltage will fluctuate above and below the bias voltage. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases above bias voltage toward 1,000 mV indicates a rich fuel mixture. An HO2S voltage that decreases below bias voltage toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the control module to calculate the air-to-fuel ratio sooner.

The HO2S utilizes the following circuits :

A signal circuit
A low reference circuit
An ignition 1 voltage circuit
A heater control circuit

Conditions for Running the DTC

Before the ECM can report DTC P2096 or P2098 failed, DTCs P0030, P0031, P0032, P0041, P0050, P0051, P0052, P0101, P0131, P0132, P0135, P0137, P0138, P0140, P0141, P0151, P0152, P0155, P0157, P0158, P0160, P0161, P2231, P2234, P2237, P2240, P2243, P2247, P2251, P2254, P2270, P2271, P2273, P2626, and P2629 must run and pass.
The engine is operating for more than 2 seconds.
The post catalyst fuel trim control is enabled.
The front and rear HO2S are in Closed Loop.
DTCs P2096and P2098 run continuously once the above conditions are met for more than 40 seconds.

Conditions for Setting the DTC

The post catalyst fuel trim correction factor is biased lean by more than 3 percent of the HO2S lambda value for more than 4 seconds.

Action Taken When the DTC Sets

DTCs P2096 and P2098 are Type E DTCs.

Conditions for Clearing the DTC

DTCs P2096 and P2098 are Type E DTCs.

Circuit/System Verification

With the engine running, observe the HO2S voltage parameter. The reading should fluctuate above and below the range of 350-550 mV.
If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

Circuit/System Testing

Ignition OFF, disconnect the harness connector of the appropriate HO2S.
Ignition ON, verify that the HO2S parameter is between 350-500 mV.

If less than 350 mV, test the signal circuit of the HO2S sensor for a short to ground. If the circuit/connections test normal, replace the ECM.

Verify that none of the following conditions exist :

Lean fuel injectors
Water intrusion in the HO2S harness connector.
Low fuel system pressure
Fuel that is contaminated
Exhaust leaks near the HO2S.
Contaminated HO2S - Silicon.
Engine vacuum leaks.

If you find any of the above conditions, repair as necessary.

If all circuits/connections test normal, replace the applicable HO2S.

Diagnostic Trouble Code (DTC) P2097 or P2099

DTC Descriptor

DTC P2097 : Post Catalyst Fuel Trim System High Limit Bank 1

DTC P2099 : Post Catalyst Fuel Trim System High Limit Bank 2

Diagnostic Fault Information

Perform the Diagnostic System Check prior to using this diagnostic procedure.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
HO2S Signal	P0131, P0137, P2096, P2098	P0134, P0140	P0132, P0138, P2097, P2099	P0133
Low Reference	-	P0134, P0140	P0132, P0138, P2097, P2099	P0133

Circuit Description

The HO2S utilizes the following circuits :

A signal circuit
A low reference circuit
An ignition 1 voltage circuit
A heater control circuit

Conditions for Running the DTC

Before the ECM can report DTC P2096 or P2098 failed, DTCs P0030, P0031, P0032, P0041, P0050, P0051, P0052, P0101, P0131, P0132, P0135, P0137, P0138, P0140, P0141, P0151, P0152, P0155, P0157, P0158, P0160, P0161, P2231, P2234, P2237, P2240, P2243, P2247, P2251, P2254, P2270, P2271, P2273, P2626 and P2629 must run and pass.
The engine is operating for more than 2 seconds.
The post catalyst fuel trim control is enabled.
The front and rear HO2S are in Closed Loop.
DTCs P2097 and P2099 run continuously once the above conditions are met for more than 40 seconds.

Conditions for Setting the DTC

The post catalyst fuel trim correction factor is biased rich by more than –3 percent of the HO2S lambda value for more than 4 seconds.

Action Taken When the DTC Sets

DTCs P2097 and P2099 are Type E DTCs.

Conditions for Clearing the DTC

DTCs P2097 and P2099 are Type E DTCs.

Circuit/System Verification

With the engine running, observe the HO2S voltage parameter. The reading should fluctuate above and below the range of 350-550 mV.
If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

Circuit/System Testing

Ignition OFF, disconnect the harness connector of the appropriate HO2S.
Ignition ON, verify that the HO2S parameter is between 350-500 mV.

If less than 350 mV, test the signal circuit of the HO2S sensor for a short to ground. If the circuit/connections test normal, replace the ECM.

Verify that none of the following conditions exist :

Rich fuel injectors
Water intrusion in the HO2S harness connector
High fuel system pressure
Fuel that is contaminated
Fuel saturation of the evaporative emissions (EVAP) canister
Restricted exhaust
Contaminated HO2S - Silicon

If you find any of the above conditions, repair as necessary.

If all circuits/connections test normal, replace the applicable HO2S.

Diagnostic Trouble Code (DTC) P2105

DTC Descriptor

DTC P2105 : Throttle Actuator Control (TAC) System - Forced Engine Shutdown

Diagnostic Fault Information

Perform the Diagnostic System Check prior to using this diagnostic procedure.

Circuit/System Description

Conditions for Running the DTC

The ECM power down process in the last drive cycle completely finished.
DTC P2105 runs continuously once the above condition is met.

Conditions for Setting the DTC

The ECM detects an incorrect voltage level at the ignition 1 voltage supply circuits.

Action Taken When the DTC Sets

DTC P2105 is a Type A DTC.

Conditions for Clearing the DTC

DTC P2105 is a Type A DTC.

Diagnostic Aids

If DTC P2105 sets, the engine will stall and not restart until the ignition is cycled OFF and then ON.
Additional DTCs set when P2105 sets.
The ignition key will not be able to be removed from the ignition switch until another ignition cycle occurs.

Circuit/System Verification

Start the engine, rapidly move the accelerator pedal from the rest position, to wide open throttle position, back to the rest position. Repeat the procedure a few times. DTC P2105 should not set.
If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.

Circuit/System Testing

Ignition OFF, remove the engine control module (ECM) or the HFV6 ECM fuse. Verify the fuse is OK.

Important : This DTC will only set if the fuse is open and the circuits are not grounded. The ignition 1 voltage circuits must be tested thoroughly for an intermittent short to ground.

If the fuse is open, test both ignition 1 voltage circuits between the fuse and the ECM for an intermittent short to ground.

Install the fuse.
Disconnect the harness connector of the ECM. Ignition ON, load test for battery voltage at both of the ignition 1 circuits at the ECM.

If less than B+, repair the ignition 1 circuit for an open/high resistance.

If all circuits/connections test OK, replace the ECM.

Diagnostic Trouble Code (DTC) P2107

DTC Descriptor

DTC P2107 : Throttle Actuator Control (TAC) Module Internal Circuit

Diagnostic Fault Information

Perform the Diagnostic System Check prior to using this diagnostic procedure.

Circuit/System Description

The engine control module (ECM) controls the throttle valve by applying a varying voltage to the throttle actuator control motor. The ECM monitors the actual throttle valve position using throttle position (TP) sensor 1 and 2. The ECM amplifies the TP sensor 1 signal in order to obtain a more accurate signal. The ECM monitors the TP sensor 1 amplification output whenever the ignition is ON and a closed throttle test is performed.

Conditions for Running the DTC

The vehicle speed is 0 km/h (0 mph).
The engine speed is less than 40 RPM.
The engine coolant temperature (ECT) is 5-85°C (41-185°F).
The intake air temperature (IAT) is 5-60°C (41-140°F).
The ignition 1 voltage is more than 10 volts.
The accelerator pedal position (APP) is less than 15 percent.
The ECM is performing the closed throttle test with the ignition ON and the engine OFF.
DTC P2107 runs once the above conditions are met during the throttle actuator control system initialization.

Conditions for Setting the DTC

The ECM detects the internal TP sensor 1 amplification output does not correlate with the TP sensor 1 signal voltage for more than 4 seconds.

Action Taken When the DTC Sets

DTC P2107 is a Type C DTC.

Conditions for Clearing the DTC

DTC P2107 is a Type C DTC.

Circuit/System Verfication

Ignition ON, observe the DTC information with a scan tool for 30 seconds. DTC P2107 should not set.

If DTC P2107 sets, replace the ECM.

If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.

Diagnostic Trouble Code (DTC) P2111

DTC Descriptor

DTC P2111 :Throttle Actuator Control (TAC) Throttle valve Stuck Open

Diagnostic Fault Information

Perform the Diagnostic System Check prior to using this diagnostic procedure.

Circuit/System Description

The engine control module (ECM) controls the throttle valve by applying a varying voltage to the control circuits of the throttle actuator control (TAC) motor. The ECM monitors the duty cycle that is required to actuate the throttle valve. The ECM monitors the throttle position (TP) sensors 1 and 2 to determine the actual throttle valve position. The ECM performs diagnostics that monitor the voltage levels of both APP sensors, both TP sensors, and the throttle actuator control motor circuit. It also monitors the spring return rate of both return springs that are housed internal to the throttle body assembly. These diagnostics are performed at different times based on whether the engine is running, not running, or whether the ECM is currently in a throttle body relearn procedure. Every ignition cycle, the ECM performs a quick throttle return spring test to make sure the throttle plate can return to the 7 percent rest position from the 0 percent position. This is to ensure that the throttle plate can be brought to the rest position in case of an actuator motor circuit failure

Conditions for Running the DTC

The ignition is switched ON.
The speed is less than 40 km/h.
The air intake temperature is greater than 40°C.

Conditions for Setting the DTC

The actual engine speed is greater than the desired engine speed by at least 200 rpm for longer than 10 seconds or the ECM detects 3 fuel cut off’s due to engine over speed while the engine is idling

Action Taken When the DTC Sets

DTC P2111 is a type A DTC.

Conditions for Clearing the DTC

DTC P2111 is a type A DTC.

Circuit/System Verication

Start the engine, rapidly move the accelerator pedal from the rest position, to wide open throttle position, back to the rest position. Repeat the procedure a few times. DTC P2111 should not set.
If the vehicle passes the Circuit/System Verification test then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.

Circuit/System Testing

Disconnect the harness connector of the ECM. Ignition ON, load test for battery voltage on the ignition circuits at the ECM.

If less than B+, repair the ignition circuit for an open/high resistance.

If all circuits/connections test OK, replace the ECM.