Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008HHR L4-2.4LREPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSENGINE CONTROLS - MIL ON/REDUCED POWER MESSAGE/DTC P2135
2008 Chevrolet HHR L4-2.4L
Engine Controls - MIL ON/Reduced Power Message/DTC P2135
2008 Chevrolet HHR L4-2.4LSECTION Engine Controls - MIL ON/Reduced Power Message/DTC P2135
TECHNICAL
Bulletin No.: 08-06-04-022B
Date: March 02, 2009
Subject:
Intermittent Check Engine Light On, Engine Power Reduced Message Displayed in DIC, DTC P2135 Set (Inspect Engine Wiring Harness for Chafing and Recrimp ECM Terminals, if Necessary)
Models:
2006-2009 Chevrolet HHR
with 2.2L or 2.4L Engine (VINs B, D, P, V - RPOs LE8, L61, LE5, LE9)
Supercede:
This bulletin is being revised to add the 2009 model year. Please discard Corporate Bulletin Number 08-06-04-022A (Section 06 - Engine/Propulsion System).
Condition
Some customers may comment that the check engine light is on and an engine reduced power message is displayed in the DIC.
A scan tool may reveal DTC P2135 set as current or in history.
Cause
This condition may be due to poor terminal crimps within the ECM connector, resulting in resistance at the affected circuits.
Correction
Perform the following as necessary.
1. Inspect the engine wiring harness for potential shorts to ground in the following locations and repair and reposition the circuits/harness as necessary:
^ on the ECM/PCM case and/or on the edge of either ECM/PCM connector body
^ at the UBEC bracket
^ at the cylinder head plate (power steering pump blockout)
^ at the EVAP purge valve bracket
^ at the rear of the cylinder head/upper edge of transmission bell housing
2. If after inspection of the engine wiring harness reveals no chafing in the areas identified above, follow SI procedures to recrimp the terminals shown above. These terminals are located in the ECM connectors. Use release tool J 38125-213 and J 38125-641 crimp tool (H jaw). Install each terminal back into the correct connector cavity and re-evaluate the concern. For additional information refer to the Engine Data Sensors - APP and TAC schematics and the Engine Control Module Connector End Views.
Warranty Information
Disclaimer
Bulletin No.: 08-06-04-022B
Date: March 02, 2009
Subject:
Intermittent Check Engine Light On, Engine Power Reduced Message Displayed in DIC, DTC P2135 Set (Inspect Engine Wiring Harness for Chafing and Recrimp ECM Terminals, if Necessary)
Models:
2006-2009 Chevrolet HHR
with 2.2L or 2.4L Engine (VINs B, D, P, V - RPOs LE8, L61, LE5, LE9)
Supercede:
This bulletin is being revised to add the 2009 model year. Please discard Corporate Bulletin Number 08-06-04-022A (Section 06 - Engine/Propulsion System).
Condition
Some customers may comment that the check engine light is on and an engine reduced power message is displayed in the DIC.
A scan tool may reveal DTC P2135 set as current or in history.
Cause
This condition may be due to poor terminal crimps within the ECM connector, resulting in resistance at the affected circuits.
Correction
Perform the following as necessary.
1. Inspect the engine wiring harness for potential shorts to ground in the following locations and repair and reposition the circuits/harness as necessary:
^ on the ECM/PCM case and/or on the edge of either ECM/PCM connector body
^ at the UBEC bracket
^ at the cylinder head plate (power steering pump blockout)
^ at the EVAP purge valve bracket
^ at the rear of the cylinder head/upper edge of transmission bell housing
2. If after inspection of the engine wiring harness reveals no chafing in the areas identified above, follow SI procedures to recrimp the terminals shown above. These terminals are located in the ECM connectors. Use release tool J 38125-213 and J 38125-641 crimp tool (H jaw). Install each terminal back into the correct connector cavity and re-evaluate the concern. For additional information refer to the Engine Data Sensors - APP and TAC schematics and the Engine Control Module Connector End Views.
Warranty Information
Disclaimer
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.