Volt

DTC P0011 or P0014

The camshaft position (CMP) actuator system enables the engine control module (ECM) to change the timing of the camshaft while the engine is operating. The ECM controls the camshaft position actuator magnet duty cycle by controlling the amount of ON time. The magnet controls the amount of engine oil flow to the CMP actuator by extending a pintle within the solenoid. The pintle acts against a spool valve in the CMP actuator mechanism which is attached to the front of the camshaft. As the spool valve is moved, oil is directed to the CMP actuator, which rotates the camshaft. The ECM can only command the camshaft position actuator to retard the valve timing from the camshaft park position, or advance the valve timing back to the park position. The ECM controls the camshaft position actuator magnet by supplying a 12 V pulse width modulated (PWM) signal. The ECM supplies a ground to the low reference circuit.

The ECM detects a difference of greater than 8° between the camshaft position angle position and the desired camshaft position for greater than 30 s.

DTCs P0011 and P0014 are Type B DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Note: 

•	The engine oil level and the oil pressure are critical to the correct operation of the camshaft position (CMP) actuator system. Verify that the engine has the correct oil level and the correct oil pressure before continuing with this diagnostic.

•

The engine oil condition has a major impact on the camshaft actuator system. Debris in the oil can interfere with the camshaft position actuator solenoid and the mechanical camshaft actuator operation. Inspect for dirty or degraded crankcase oil. The engine may require an oil change. Inquire with the customer when the last oil change was performed. You may also monitor the scan tool Engine Oil Life Remaining parameter. Advise the customer an oil change may be required.

1. Verify the engine oil pressure. Refer to Oil Pressure Diagnosis and Testing
2. Vehicle in Service Mode, observe the DTC information with a scan tool. Verify DTC P0010, P0013, P0016, P0017, P0335, P0336, P0340, P0341, P0365, or P0366 is not set.

⇒	If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle

3. Engine running at operating temperature, command the appropriate Inlet or Exhaust CMP Actuator to 20° with a scan tool. The Desired Inlet or Exhaust Camshaft Position parameter value should match the Inlet or Exhaust Camshaft Position angle parameter value.
4. Observe the Inlet or Exhaust Camshaft Position Variance value on the scan tool. The Inlet or Exhaust Camshaft Position Variance value will increment for several seconds until the Inlet or Exhaust Camshaft Position angle value matches the Desired Inlet or Exhaust Camshaft Position value. The Inlet or Exhaust Camshaft Position Variance value should then return to 0°.
5. Operate the vehicle within the conditions for running the DTC, to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

1. Vehicle OFF, disconnect the harness connector at the appropriate Q6 camshaft position actuator solenoid valve.
2. Vehicle OFF, all systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 2 Ω between the low reference circuit terminal 1 and ground.

⇒	If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

Note: A test lamp must be used for this test. The control circuit is pulled-up to a low current voltage. The current is too low to illuminate a test lamp. A voltage on the control circuit is normal.

3. Vehicle in Service Mode, verify that a test lamp does not illuminate between the control circuit terminal 2 and ground.

⇒	If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Connect the DMM negative lead to the control circuit terminal 2. Connect the DMM positive lead to B+. Set the DMM on the diode setting. Command the CMP Actuator Solenoid ON and OFF with a scan tool. The DMM should transition from OL when commanded OFF to less than 1 V when commanded ON.

⇒	If the circuit voltage does not correspond to the specified values, test the control circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the ECM.

5. Vehicle OFF, swap the appropriate Q6 camshaft position actuator solenoid valve with a Q6 camshaft position actuator solenoid valve that is operating correctly.

Note: This step tests the mechanical camshaft position actuator which is part of the inlet and exhaust sprocket assembly.

6. Engine idling, command the appropriate Camshaft Position Actuator from 0° to 20° and back to zero while observing the appropriate scan tool Inlet/Exhaust Camshaft Position Variance parameters. The Inlet/Exhaust Camshaft Position Variance should be less than 2° in each of the commanded states.

⇒	If greater than the specified value, replace the mechanical camshaft position actuator.

7. If all circuits and components test normal, replace the Q6 camshaft position actuator solenoid valve.

Static Test

1. Vehicle OFF, disconnect the harness connector at the appropriate Q6 camshaft position actuator solenoid valve.
2. Test for 5.0-9.0 Ω between the solenoid control terminal 2 and the low reference terminal 1 at the camshaft position actuator solenoid valve.

⇒	If not within the specified range, replace the Q6 camshaft position actuator solenoid valve.

3. Test for infinite resistance between each terminal of the solenoid and the solenoid housing.

⇒	If not the specified value, replace the Q6 camshaft position actuator solenoid valve.

Dynamic Test

1. Remove the appropriate Q6 camshaft position actuator solenoid valve.
2. Install a 10 A fused jumper wire between the control circuit terminal 2 and 12 V. Momentarily install a jumper wire between the low reference terminal 1 and ground. The pintle should extend.

Note: 

•	The camshaft position actuator solenoid pintle should be facing downward for this test.

•	Do not allow electrical current to flow through the camshaft position actuator solenoid for greater than 1-2 s.

⇒	If the function does not perform as specified, replace the Q6 camshaft position actuator solenoid valve.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.