Fix Your HHR’s Shifting Problems for Good
If you’re dealing with a 2006-2011 Chevrolet HHR that’s shifting harshly, getting stuck in gear, or throwing transmission codes, you’ve come to the right place. As a technician with over two decades of diagnostic experience, I’ve seen firsthand how a failing Transmission Control Module (TCM) can turn a reliable vehicle into a source of daily frustration. This T42 TCM, part number 24235732, is the definitive solution, arriving pre-programmed to your HHR’s specific VIN. This means you can skip the expensive trip to the dealership for programming—it’s a true plug-and-play fix that restores the crisp, predictable shifting you expect.
A Technician’s Notebook: The HHR Stuck in Limp Mode
A customer brought in their 2009 HHR, complaining that it felt dangerously sluggish and the check engine light was on. It was stuck in what we call ‘limp mode’—it wouldn’t shift out of 2nd gear. A quick scan pulled a P0700 (Transmission Control System Malfunction) and a P0752 (Shift Solenoid ‘A’ Stuck On). While the solenoid code pointed to a potential internal issue, my experience with these platforms suggested otherwise. We checked the wiring and found no issues. Instead of jumping to a costly transmission teardown, we swapped in a VIN-programmed HHR Transmission Control Module. After a 15-minute install and clearing the codes, the car shifted perfectly through all gears. The faulty TCM was sending erroneous signals, mimicking a solenoid failure. This part saved the customer over a thousand dollars in unnecessary labor and diagnostics.
Is Your HHR Exhibiting These Transmission Faults?
A failing TCM is the electronic brain of your transmission, and when it malfunctions, the symptoms are hard to ignore. A faulty HHR Transmission Control Module is often the root cause of these common issues:
- ✔ Harsh, banging shifts or delayed gear engagement from a stop.
- ✔ The vehicle is stuck in a single gear (limp mode) to protect the transmission.
- ✔ Check Engine Light is illuminated with codes like P0700, P0750, P0755, or other solenoid-related DTCs.
- ✔ Inconsistent or no shifting, causing poor acceleration and terrible fuel mileage.
- ✔ Complete loss of communication with the module, preventing the vehicle from starting or shifting out of park.
DIY-Friendly Installation Guide
Replacing the HHR Transmission Control Module is a straightforward job that most DIYers can complete in their driveway in under 30 minutes. No specialized tools are required.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the onboard systems.
- Locate the Module: On the 2006-2011 HHR, the TCM is typically found in the left-hand (driver’s side) engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. If you have a basic scan tool, use it to clear any stored fault codes. Take the vehicle for a test drive to confirm smooth shifting.
Guaranteed Fitment For Your General Motors Vehicle
This module is a direct-fit replacement for your 2006-2011 Chevrolet HHR. While it is programmed specifically for your vehicle, it also serves as a compatible replacement for a wide range of other GM cars, trucks, and SUVs that use the T42 controller. It is interchangeable with part numbers 24252114, 24234503, 24235732, and more. Please verify your part number or contact us with your VIN to ensure 100% compatibility.
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. We pre-program this module to your vehicle’s VIN before shipping. It arrives ready for installation, with no additional programming or flashing required. This saves you time and hundreds of dollars in dealership fees.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it without the hassle of returning it.
What is the warranty on this TCM?
This module is backed by our one-year, hassle-free warranty, covering any defects in materials or workmanship for your peace of mind.
Will this fix my P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. In a vast majority of cases where the TCM itself is the source of the electrical fault, replacing it with this programmed unit will resolve the code and the underlying issue.
What if I have other transmission problems?
This module corrects electronic and software-related failures. It will not fix internal mechanical problems like a broken gear or a burnt clutch pack. If you’re unsure about your diagnosis, we recommend consulting a professional mechanic.