Restore Your Cobalt’s Shifting Performance
If you’re dealing with the frustration of a Chevrolet Cobalt that won’t shift correctly, gets stuck in gear, or has a persistent check engine light, a faulty Transmission Control Module (TCM) is the most likely culprit. As a technician with over two decades of experience, I’ve seen these exact issues countless times. This isn’t just an annoyance; it’s a critical failure that affects your car’s drivability and safety. Our replacement T42 TCM, part number 24234274, is the definitive solution, engineered to restore the precise, smooth operation you expect from your vehicle.
This module is the brain of your automatic transmission, controlling everything from shift points to torque converter clutch engagement. When it fails, communication breaks down, leading to the erratic behavior you’re experiencing. We solve this problem by providing a high-quality replacement that comes pre-programmed to your Cobalt’s specific Vehicle Identification Number (VIN). This means no expensive trips to the dealership for programming—it’s a true plug-and-play fix that gets you back on the road with confidence.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Cobalt with the classic symptoms: stuck in 3rd gear (limp mode) and a check engine light. They had already replaced two shift solenoids based on the codes, but the problem persisted. After a quick scan, I saw the familiar P0700 (Transmission Control System Malfunction) code, which is a general flag, but the key was the intermittent communication loss with the TCM. In my shop, I’ve diagnosed hundreds of these T42 module failures. The internal circuit boards can develop micro-fractures from heat cycles and vibration, leading to these ghost-in-the-machine problems. Installing a new, VIN-programmed 2006-2010 Cobalt TCM resolved all the codes and shifting issues in under an hour, saving the customer from a costly and unnecessary transmission rebuild.
Is Your Cobalt Showing These Telltale Signs?
- ✔ Harsh, erratic, or delayed gear shifts that make driving unpredictable.
- ✔ The vehicle is stuck in “limp mode,” usually in 2nd or 3rd gear, with limited power.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on your dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0751, P0752, or other solenoid-related faults.
- ✔ A complete failure to upshift or downshift, leading to poor acceleration and terrible fuel economy.
- ✔ Intermittent electrical problems that seem to have no other source.
DIY-Friendly Installation: Your Cobalt Back on the Road in Under 30 Minutes
One of the best features of this module is how straightforward the installation is. You don’t need a lift or specialized tools. For your 2006-2010 Cobalt TCM, the module is conveniently located and easy to access.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the TCM: On the 2006-2010 Cobalt, you will find the TCM mounted on the driver’s side strut tower in the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly to avoid damaging them. 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. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes from the ECU. Start the car and enjoy smooth shifting!
Verified Fitment for Your Vehicle
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles. While this page is dedicated to the 2006-2010 Cobalt TCM, it is also compatible with the models listed below. It interchanges with part numbers 24234274, 24252114, 24234503, and others.
- Chevrolet Cobalt (2006-2010) – Transmission; (LH strut tower)
- Chevrolet HHR (2006-2011) – Transmission; (LH engine compartment)
- Chevrolet Impala (2006-2011) – Transmission; (lower air cleaner housing)
- Chevrolet Malibu (2006-2010) – Transmission; (LH frame rail)
- Pontiac G5 (2007-2010) – Transmission; (LH strut tower)
- Pontiac G6 (2006-2010) – Transmission; (LH strut tower)
- Saturn Aura (2007-2009) – Transmission; (LH frame rail front)
- Saturn Ion (2006-2007) – Transmission; (behind LH strut tower)
- …and many other GM cars, trucks, and SUVs. Please verify your part number or contact us for fitment confirmation.
Frequently Asked Questions
Do I need to take my car to the dealer for programming?
No. This module comes fully programmed to your vehicle’s VIN. It is ready for installation right out of the box, saving you time and the high cost of dealership programming.
What information do you need to program the module?
We require your vehicle’s 17-digit Vehicle Identification Number (VIN) to program the module with the correct software and calibrations for your specific Cobalt. Please provide it during checkout.
Is this a difficult part for a DIYer to install?
Not at all. For the Cobalt, the TCM is located on the driver’s side strut tower, making it one of the easier modules to replace. With basic hand tools, the job typically takes less than 30 minutes.
Will this fix a P0700 code?
Yes, in many cases. A P0700 code is a general fault indicating the TCM has detected a problem. If the TCM itself is the source of the failure, replacing it will resolve the P0700 code and any related specific codes (like for solenoids).
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or dispose of it without the hassle of returning it, making the process simpler for you.