Restore Peak Performance to Your Chevrolet HHR’s Transmission
Is your 2006-2011 Chevrolet HHR struggling with harsh shifting, delayed gear engagement, or getting stuck in limp mode? These are classic signs of a failing Transmission Control Module (TCM), the electronic brain of your automatic transmission. A faulty TCM can disrupt communication between the engine and transmission, leading to poor performance, decreased fuel economy, and dashboard warning lights. This direct-fit T42 TCM, service part number 24239926, is the definitive solution to restore the smooth, reliable operation you expect from your vehicle.
From the Diagnostic Bay
We had a 2009 HHR come into the shop with a persistent P0752 code (Shift Solenoid ‘A’ Stuck On) and very harsh 1-2 shifts. The owner had already replaced the solenoid pack twice at another shop, but the problem kept returning within a week. After hooking up our scanner and monitoring live data, we saw the TCM was commanding the solenoid erratically, despite the solenoid itself being new. The internal drivers in the original TCM were failing. We installed one of our VIN-programmed T42 modules, cleared the codes, and performed a road test. The shifts were immediately crisp and smooth, and the P0752 code never returned. It’s a textbook case where chasing the code instead of diagnosing the controller leads to wasted time and money.
Symptoms of a Failing HHR Transmission Control Module
A failing TCM can manifest in various ways, often mimicking mechanical transmission problems. If you’re experiencing any of the following issues, your TCM is the likely culprit:
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ The vehicle gets stuck in a single gear (limp mode), often 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related codes are present.
- ✔ Failure to upshift or downshift properly.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ The transmission seems to slip out of gear unexpectedly.
The Plug-and-Play Solution: VIN Programming Included
Replacing a TCM isn’t just about swapping hardware. Modern vehicles require the module to be programmed specifically to the car’s Vehicle Identification Number (VIN). This process ensures all systems communicate correctly for optimal performance and function. Our service eliminates the need for an expensive trip to the dealership. We pre-program this HHR Transmission Control Module with the latest GM software updates using your vehicle’s VIN. When it arrives, it’s ready for a straightforward, plug-and-play installation. This not only saves you hundreds in programming fees but also ensures the module works perfectly right out of the box, resolving common software-related DTCs and driveability issues.
Installation and Compatibility
Installation is simple for a competent DIY mechanic. On the 2006-2011 Chevy HHR, the TCM is typically located in the left-hand (driver’s side) engine compartment. Always disconnect the vehicle’s battery before starting the replacement. After installing the new module, reconnect the battery and use a standard OBD2 scan tool to clear any stored fault codes. This module is a direct replacement for multiple service numbers, including 24252114, 24234503, 24239926, and others listed in the compatibility chart. Enjoy the peace of mind that comes with our one-year warranty and a no-core-charge policy.
Frequently Asked Questions
What is VIN programming and why is it essential?
VIN programming loads your vehicle’s specific software and settings onto the new Transmission Control Module. This is crucial for the TCM to communicate correctly with the Engine Control Module (ECM) and other vehicle systems. Without it, your HHR may not start, shift properly, or may display error messages. We handle this for you, so it’s ready to install upon arrival.
Do I need a dealership to install this module?
No. Because we pre-program the module to your VIN, you do not need a dealership for installation or programming. This is a plug-and-play part that can be installed by a knowledgeable DIYer or any trusted mechanic, saving you significant time and money.
Will this fix my specific transmission error code?
This module is the definitive fix for issues originating from a faulty TCM, including common codes like P0700 (Transmission Control System Malfunction) and various solenoid circuit codes (P0750-P0770 series). If the root cause of the code is the module’s internal electronics, this replacement part will resolve it.
Is there a core charge for my old part?
No, we do not require a core charge. You can keep your old part without any hassle or extra fees, making the replacement process simpler and more affordable.
How do I ensure this is the correct part for my HHR?
This module is designed for 2006-2011 Chevrolet HHR models. You can confirm compatibility by matching your old part number to one of the interchangeable numbers listed on our product page, such as 24239926. Providing your VIN during checkout guarantees we program the correct software for your specific vehicle.