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.
Control Module: Service and Repair
2011 Chevrolet HHR L4-2.4LSECTION Service and Repair
Transmission Control Module Replacement
Removal Procedure
1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (Battery Negative Cable Disconnection and Connection).
2. Remove the cover from the engine control module (ECM) and transmission control module (TCM).
Note: Use care not to damage connector retaining levers.
3. Remove the electrical harness connector from the TCM.
Caution: Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables or when charging the vehicles battery.
4. Press the retaining tab (1) in order to release the TCM from the under hood junction block bracket.
5. Remove the TCM (2) from the under hood junction block bracket.
Installation Procedure
1. Place the TCM (2) into the under hood junction block bracket (3).
2. Install the TCM electrical harness connector to the TCM.
3. Install the cover on the ECM and TCM.
4. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (Battery Negative Cable Disconnection and Connection).
5. Program the TCM. Refer to Control Module References (Programming and Relearning) for programming and setup information.
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.