Restore Flawless Shifting to Your Chevrolet HHR
If your 2006-2011 Chevrolet HHR is suffering from erratic shifting, getting stuck in gear, or displaying transmission-related warning lights, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for every gear change, torque converter operation, and pressure regulation. When it fails, it can make your vehicle unreliable and frustrating to drive. This genuine quality T42 TCM, part number 24239224, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
Expert Pro Tip
Before condemning your TCM, always perform a full electrical system check. Ensure your battery has a full charge (at least 12.6 volts) and that the main engine and chassis ground connections are clean, tight, and free of corrosion. Poor power or ground connections can starve the module of voltage, causing symptoms that perfectly mimic internal TCM failure.
Diagnosing a Faulty HHR Transmission Control Module
A failing HHR Transmission Control Module can manifest in several ways, often starting as intermittent issues before becoming a constant problem. The internal electronics can break down from years of heat cycles and vibration, leading to poor communication with transmission solenoids and sensors. This results in the classic symptoms that indicate it’s time for a replacement. Recognizing these signs early can save you from further transmission damage and costly repairs down the line.
Common Symptoms of TCM Failure
- ✔ Harsh or Erratic Shifting: Your HHR may slam into gear, hesitate between shifts, or shift at the wrong RPMs.
- ✔ Stuck in Limp Mode: The vehicle may refuse to shift out of a single gear (usually 2nd or 3rd) to prevent further damage.
- ✔ Check Engine Light: You’ll often see a Check Engine Light or a dedicated transmission warning light on the dash, accompanied by specific trouble codes.
- ✔ Diagnostic Trouble Codes (DTCs): A scan tool will reveal codes like P0700 (Transmission Control System Malfunction) or various solenoid-specific codes (e.g., P0751, P0756).
- ✔ Delayed Engagement: A noticeable delay when shifting from Park into Drive or Reverse.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lockup issues caused by a faulty TCM can lead to a significant drop in gas mileage.
The Critical Advantage of VIN Programming
Why is VIN programming essential? Every GM vehicle has unique software parameters for its transmission based on engine size, axle ratio, and tire size. Our service eliminates the guesswork and the expensive trip to the dealership. We flash this module with the latest GM-certified software specific to your HHR’s VIN before it ships. This ensures that the TCM communicates perfectly with your vehicle’s engine computer and other modules right out of the box. You get optimal shift patterns, correct torque converter lockup, and reliable performance without any additional programming fees or tools.
This module is a direct replacement for a wide range of GM vehicles using the T42 controller and is interchangeable with service numbers such as 24242391, 24234503, 24252114, and many more. It’s the ideal part for a precise, lasting repair on your HHR Transmission Control Module.
Frequently Asked Questions
Frequently Asked Questions
What is VIN programming and why do I need it?
VIN programming is the process of loading your vehicle’s specific software and calibration files onto the module. It ensures the TCM works perfectly with your HHR’s engine, tire size, and axle ratio for correct shifting. Our pre-programming service makes the part ready to install upon arrival, saving you a costly trip to the dealer.
Is this part difficult to install on my HHR?
No, installation is straightforward for a DIYer with basic tools. On the 2006-2011 HHR, the TCM is located in the left-hand (driver’s side) engine compartment. The process typically involves disconnecting the battery, unplugging the electrical connectors, unbolting the old module, and installing the new one. The entire job can usually be completed in under 30 minutes.
Do I need to send my old TCM back?
No core charge is required for this module. You can keep your old part, avoiding the hassle and expense of shipping a core back.
Will this module fix my specific transmission problem?
This module is designed to correct issues directly caused by a faulty TCM, such as electronic shifting errors, communication faults, and limp mode. If your vehicle’s problems are caused by internal mechanical failures (like worn clutches or a bad valve body), this part will not resolve them. A proper diagnosis is always recommended.
How can I confirm this is the right part for my vehicle?
This module is guaranteed to fit 2006-2011 Chevrolet HHR models. You can also verify by matching the part number 24239224 or one of the interchangeable service numbers listed in the description to your original part.