Is Your Chevy HHR Experiencing Transmission Nightmares?
If you’re dealing with erratic shifting, a check engine light that won’t quit, or your 2006-2011 Chevrolet HHR is stuck in ‘limp mode,’ you’re likely facing a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for every gear change and ensuring smooth, efficient operation. When it fails, it can cause a cascade of frustrating and potentially damaging issues. This T42 Transmission Control Module, service part number 24234274, is the definitive solution to restore your vehicle’s performance and reliability.
From the Diagnostic Bay
We had a 2009 HHR come into the shop with classic symptoms of a bad shift solenoid – harsh 1-2 shifts and a related trouble code. The owner had already spent a few hundred dollars replacing the solenoid pack himself, but the problem persisted. After a quick diagnostic scan, we saw communication errors pointing not to the solenoids, but to the controller. The internal circuitry of his original TCM was failing, sending faulty signals. We installed a VIN-programmed T42 module, cleared the codes, and the car shifted perfectly. It’s a common scenario where diagnosing the root cause saves time, money, and a lot of headaches.
Common Symptoms of a Failing HHR Transmission Control Module
- ✔ Erratic Shifting: Your HHR may experience harsh, delayed, or slamming shifts between gears.
- ✔ Stuck in Gear: The vehicle may enter a fail-safe or ‘limp mode,’ often getting stuck in 2nd or 3rd gear to prevent further damage.
- ✔ Warning Lights: The Check Engine Light or a specific transmission warning light will illuminate on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): You’ll often see codes like P0700 (Transmission Control System Malfunction) or various solenoid circuit codes (P0750, P0753, etc.).
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lock-up issues caused by a faulty TCM can lead to a noticeable drop in MPG.
- ✔ No Communication: In severe cases, a scan tool may be unable to communicate with the TCM, indicating a complete failure.
The Direct-Fit, Programmed Solution
Forget expensive trips to the dealership for programming and diagnostics. This T42 TCM is a comprehensive, ready-to-install solution. The most critical feature is our complimentary VIN Programming Service. When you place your order, we use your vehicle’s unique Vehicle Identification Number (VIN) to load the latest GM-certified software directly onto the module. This ensures that it communicates flawlessly with your HHR’s engine computer and other systems right out of the box. It’s a true plug-and-play fix that eliminates the need for specialized tools or additional labor costs.
Built to meet and exceed original equipment manufacturer standards, this module is engineered for durability and long-lasting performance. It directly replaces a wide range of original part numbers, including 24252114, 24234503, 24230461, and many others, making it a versatile fix for not only the HHR but also a wide array of GM vehicles like the Cobalt, G6, Impala, and Saturn Vue.
Simple Installation to Get You Back on the Road
Replacing the TCM on a 2006-2011 HHR is a straightforward job that can be completed with basic hand tools in under an hour. The module is typically located in the LH (driver’s side) engine compartment. Always disconnect the vehicle’s battery before beginning the installation to ensure safety and help reset the vehicle’s electronic systems. Once the new module is installed and the battery is reconnected, use a standard OBD2 scan tool to clear any stored diagnostic trouble codes. With no core charge, you don’t have to worry about the hassle and expense of returning your old part.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. This module comes pre-programmed to your vehicle’s specific VIN. It is ready for installation right out of the box, saving you the time and expense of a dealership visit.
Where is the TCM located on my 2007 Chevy HHR?
On the 2006-2011 Chevrolet HHR, the Transmission Control Module is typically found in the engine compartment on the driver’s side (LH side), often near the strut tower or under the air cleaner box.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause of a P0700, it’s essential to diagnose any other specific codes that are present to confirm the TCM is the source of the issue.
Is this compatible with other GM vehicles?
Yes, this T42 TCM is compatible with a wide range of GM vehicles from approximately 2006-2014 that use 4-speed automatic transmissions like the 4L60E and 4L65E. This includes models like the Impala, Cobalt, G6, Silverado, Tahoe, and more. Please verify fitment for your specific vehicle.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your old part or dispose of it without any extra fees or hassle.