Restore Flawless Shifting to Your Chevy HHR
Is your 2006-2011 Chevrolet HHR suffering from frustrating and unpredictable shifting? A faulty Transmission Control Module (TCM) can turn your reliable daily driver into a source of constant stress. Symptoms like harsh gear changes, getting stuck in ‘limp mode,’ or a persistent check engine light are clear signs that the brain of your transmission is failing. This replacement T42 Transmission Control Module is the definitive solution, pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair that gets you back on the road with confidence.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a failing TCM is the likely culprit. This module is engineered to resolve these exact issues:
- Harsh or Erratic Shifting: Abrupt, jerky gear changes or delayed engagement from park to drive.
- Stuck in Gear / Limp Mode: The vehicle refuses to shift past 2nd or 3rd gear as a safety measure.
- Check Engine & Transmission Lights: Often accompanied by diagnostic trouble codes (DTCs) like P0700, P0750, or other solenoid-related faults.
- Poor Performance: A noticeable drop in fuel economy, sluggish acceleration, or a complete failure to upshift or downshift.
Installing this pre-programmed 2006-2011 HHR Transmission Control Module directly addresses the electronic failures within the original unit, restoring crisp, intelligent shifting and clearing fault codes for good.
Features & Benefits
- ✔️ 100% Plug-and-Play: This module arrives pre-programmed to your vehicle’s VIN. There is absolutely no need for an expensive trip to the dealership for additional programming—just install it and drive.
- ✔️ Restored Performance: By precisely controlling shift points, line pressure, and torque converter lockup, this TCM restores the smooth, efficient operation your HHR had from the factory.
- ✔️ The Definitive Fix: Engineered to OEM specifications to correct common failure points, providing a durable and reliable long-term solution to your transmission problems.
- ✔️ Broad GM Compatibility: While perfect for your HHR, this T42 TCM is also the correct component for a wide range of GM vehicles, including the Cobalt, Impala, G6, and many more, making it a proven and trusted part.
- ✔️ Warranty Protection: This unit is backed by our one-year replacement warranty.
Expert Insight: The Critical Role of VIN Programming
Many people are tempted to buy a used TCM from a salvage yard, hoping for a cheap fix. This is almost always a mistake. A Transmission Control Module is not a one-size-fits-all part; it’s coded specifically to the original vehicle’s engine, tire size, and gear ratios. Installing an unprogrammed or incorrectly programmed module will, at best, not work and, at worst, can cause damage to your transmission. Our VIN programming service uses the latest GM software to ensure this 2006-2011 HHR Transmission Control Module communicates flawlessly with your vehicle’s entire network, just like the original part did.
Don’t let a faulty TCM dictate how your vehicle drives. By replacing the old unit with this professionally programmed 2006-2011 HHR Transmission Control Module, you are not just buying a part; you are investing in peace of mind and restoring the dependable performance of your vehicle. Installation is straightforward for any competent DIY mechanic and can be completed in under an hour.
Frequently Asked Questions
What does a Transmission Control Module do?
The TCM acts as the computer for your automatic transmission. It receives data from various sensors on the engine and vehicle, and uses this information to control exactly when to shift gears, manage fluid pressure, and operate the torque converter for optimal performance and fuel efficiency.
Is this a difficult part to install myself?
For most HHR models, the installation is very straightforward. The TCM is typically located in the engine compartment on the driver’s side. The process involves disconnecting the battery, unplugging the electrical connectors, unbolting the old module, and installing the new one. Since our module is pre-programmed, no special tools are needed for setup.
Will this fix my P0700 error 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 important to have the vehicle scanned for other, more specific codes (like solenoid faults) that the P0700 is pointing to. In many cases, a faulty TCM is the primary issue.
What happens if I don’t provide my VIN during checkout?
Providing your Vehicle Identification Number (VIN) is essential. We cannot ship the part without it, as the programming process is tailored specifically to your vehicle’s factory settings. This ensures the module works perfectly right out of the box.
Do I need to send my old part back?
No. We do not require a core return for this part. You can keep or dispose of your old module, saving you the time and hassle of shipping it back.