Fix Your Cobalt’s Shifting Problems for Good
If you’re dealing with a 2006-2010 Chevrolet Cobalt that’s shifting erratically, getting stuck in gear, or throwing transmission codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless GM vehicles sidelined by a faulty Transmission Control Module (TCM). This isn’t just an annoyance; it’s a critical failure that can affect your car’s performance, fuel economy, and safety. This T42 TCM, service part number 24240400, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
A Technician’s Notebook: The Limp Mode Cobalt
A customer brought in a 2009 Cobalt, complaining it felt sluggish and wouldn’t shift past 2nd gear—a classic case of ‘limp mode.’ The check engine light was on, and my scan tool pulled a P0700 (Transmission Control System Malfunction) and a P0752 (Shift Solenoid ‘A’ Stuck On). While the solenoid code pointed to a specific part, my experience with these T42 modules told me to check the controller first. The internal circuitry in these TCMs can fail, sending false signals and mimicking solenoid issues. Instead of a costly and complex internal transmission repair, we started with the brain. We installed one of our VIN-programmed T42 modules, cleared the codes, and the car was shifting perfectly within 30 minutes. The problem wasn’t the solenoid; it was the module telling it what to do. This simple swap saved the customer hundreds of dollars and a lot of unnecessary work.
Is Your Cobalt Exhibiting These Transmission Woes?
A failing TCM doesn’t always mean a complete transmission failure. Often, the signs are subtle at first but will worsen over time. If you’re experiencing any of the following, your TCM is the likely culprit:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in a single gear (limp mode) and won’t upshift or downshift.
- ✔ An illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0751, P0752, or other solenoid-related faults.
- ✔ A sudden drop in fuel efficiency.
- ✔ The transmission feels like it’s slipping between gears.
- ✔ Complete loss of communication with the transmission module.
Your Straightforward 30-Minute Installation Guide
You don’t need to be a professional mechanic to replace the 2006-2010 Cobalt TCM. With basic hand tools, you can get your car back to normal in under half an hour. The module is conveniently located on the driver’s side strut tower.
- Step 1: Safety First – Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Step 2: Locate the TCM – On your Cobalt, open the hood and find the TCM mounted to the driver’s side (LH) strut tower. It’s a silver box with electrical connectors.
- Step 3: Disconnect and Remove – Carefully unplug the wiring harnesses from the old module. Then, unbolt the module from its mounting bracket.
- Step 4: Install the New Module – Bolt your new, pre-programmed TCM into place and securely reconnect the wiring harnesses. Ensure they click into place.
- Step 5: Final Steps – Reconnect the battery terminal. While our VIN programming handles the critical setup, it’s best practice to use a basic OBD-II scan tool to clear any stored fault codes from the ECU. Start the vehicle and take it for a test drive to confirm smooth shifting.
Verified Fitment For These GM Vehicles
This T42 TCM is a direct replacement for a wide range of General Motors vehicles. While this listing is focused on the 2006-2010 Cobalt TCM, it is also compatible with the following models. Please verify your part number (24240400) or contact us with your VIN.
- 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)
- CHEVROLET MONTE CARLO (2006-07) – Transmission; (lower air cleaner housing)
- PONTIAC G5 (2007-2010) – Transmission; (LH strut tower)
- PONTIAC G6 (2006-2010) – Transmission; (LH strut tower)
- PONTIAC GRAND PRIX (2006-2008) – Transmission; (lower air cleaner housing)
- 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 from 2006-2014.
Frequently Asked Questions
What is VIN programming and why do I need it?
VIN programming loads your vehicle’s specific identification number and software onto the module. This ensures it communicates perfectly with your engine computer and other systems, just like the original part. It eliminates the need for an expensive trip to the dealership for programming.
Will this fix my check engine light for code P0700?
In the vast majority of cases, yes. A P0700 code is a general fault indicating the TCM has detected a problem. Replacing a faulty TCM with our correctly programmed unit will resolve the underlying issue, allowing you to clear the code for good.
Where is the TCM located on my 2008 Chevy Cobalt?
For the 2006-2010 Chevrolet Cobalt, the Transmission Control Module is located in the engine bay, mounted directly on the driver’s side (LH) strut tower.
Do I need any special tools for installation?
No special tools are required. Basic hand tools like a socket set to unbolt the module and disconnect the battery are all you need. An OBD-II scanner is recommended to clear codes after installation but is not strictly necessary for the part to function.
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 at your convenience without the hassle of sending it back.