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Tim's Auto Repair
Tim's Auto Repair, mechanic
Category: Chevy
Satisfied Customers: 16027
Experience:  Have owned a repair shop for 25 yrs.
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We have a 2007 Chevy HHR LS, the "reduce engine power" light

Customer Question

We have a 2007 Chevy HHR LS, the "reduce engine power" light keeps popping up and the car keeps shutting down. My mechanic has done the following to no avail: 1)updated latest calibration software updates to ECM, 2)replaced pedal due to error code pedal sensor, 3)replaced throttle body, balance tensioners, gaskets, water pump and timing chain a few months back due to previous check engine lights and loss of power/acceleration. Any suggestions? Thank you for any info
Submitted: 4 years ago.
Category: Chevy
Expert:  Tim's Auto Repair replied 4 years ago.
this may be a problem with the wireharness at the pcm[computer]


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.


This condition may be due to poor terminal crimps within the ECM connector, resulting in resistance at the affected circuits.


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.

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