Service Information

Captiva

DTC P2228 or P2229 - LNP or LNQ

Diagnostic Instructions

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

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P2228 00: Barometric Pressure (BARO) Sensor Circuit Low Voltage

DTC P2229 00: Barometric Pressure (BARO) Sensor Circuit High Voltage

The barometric pressure (BARO) sensor is integrated within the engine control module (ECM). The BARO sensor responds to changes in altitude and atmospheric conditions. The BARO sensor provides the ECM an indication of barometric pressure. The BARO sensor provides a voltage signal to the ECM relative to the atmospheric pressure changes. The ECM monitors the BARO sensor signal for a voltage outside of the normal range.

Conditions for Running the DTC

The ignition is ON or the engine is running.

Conditions for Setting the DTC

P2228 00

•	The ECM detects that the BARO sensor voltage is less than 2.1 V.

•	The condition exists for greater than 1.5 s.

P2229 00

•	The ECM detects that the BARO sensor voltage is greater than 4.7 V.

•	The condition exists for greater than 1.5 s.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References

Circuit/System Verification

Engine running, observe the DTC information with a scan tool. DTCs P2228 00 or P2229 00 should not set.
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.

Circuit/System Testing

Inspect the atmospheric vent on the K20 Engine Control Module case for one of the following conditions:

•	Moisture in the vent inlet

•	Debris in the vent inlet

⇒	If a condition exists, attempt to clean or dry the atmospheric inlet.

Engine running, observe the DTC information with a scan tool. DTCs P2228 00 or P2229 00 should not set.

⇒	If DTC P2228 00 or P2229 00 sets, replace the K20 Engine Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup and programming