Is Your Chevy HHR Shifting Erratically?
If your 2006-2011 Chevrolet HHR is banging into gear, refusing to shift, or has the check engine light on with transmission codes, a faulty Transmission Control Module (TCM) is the most likely culprit. As the electronic brain of your automatic transmission, its failure can make your reliable HHR feel unpredictable and unsafe to drive. Don’t let shifting problems sideline your vehicle—this is a straightforward fix you can handle yourself.
Expert Pro Tip: A customer’s 2008 HHR came into my shop last week with a P0752 code (Shift Solenoid A Stuck On) and a nasty bang when shifting from 1st to 2nd. They had already paid another shop to replace the solenoids inside the transmission pan, but the problem didn’t go away. This is a classic misdiagnosis I’ve seen dozens of times. The issue wasn’t the solenoid; it was the driver circuit inside the TCM, which had failed from years of heat and vibration in the engine bay. We installed a VIN-programmed module, and the HHR was shifting perfectly within 20 minutes.
The Direct Solution: A Pre-Programmed T42 TCM
This OEM-quality T42 Transmission Control Module is the definitive fix for these common issues. It arrives at your door pre-programmed to your HHR’s specific Vehicle Identification Number (VIN). This means it’s ready for a true plug-and-play installation, restoring intelligent communication between your engine and transmission without requiring any expensive programming or calibration at a dealership.
Common Symptoms of a Failing 2006-2011 HHR Transmission Module
If you’re experiencing any of the following, a failing TCM is the probable cause:
- ✔ Harsh, delayed, or erratic gear shifts.
- ✔ Vehicle is stuck in one gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- ✔ Complete failure to upshift or downshift.
- ✔ Poor fuel economy and a feeling of sluggish performance.
Plug-and-Play Installation: No Dealer Visit Required
Replacing the TCM on your HHR is a simple job that typically takes less than 30 minutes with basic hand tools. Our VIN programming makes it a direct swap.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic work.
- Locate the Module: On the 2006-2011 HHR, the TCM is located in the left-hand (driver’s side) engine compartment.
- Disconnect and Remove: Carefully press the release tabs to unplug the main electrical connectors. Then, remove the bolts holding the module to its mounting bracket.
- Install the New TCM: Secure the new, pre-programmed module onto the bracket and firmly reconnect the electrical harnesses until they click into place.
- Finalize the Job: Reconnect the negative battery terminal. The pre-programming ensures the module works immediately, but we recommend using a basic OBD2 scanner to clear any old fault codes from the system’s memory.
Part Specifications & Compatibility
- Part Number: 24235340
- Programming: Comes fully programmed to your VIN for guaranteed compatibility.
- Core Charge: None! You are not required to return your old part.
- Warranty: Backed by our one-year warranty for your peace of mind.
- Interchangeable With: 24252114, 24234503, 24230461, 24234274, 24235754, 24238856, 24239224, 24239926, and more.