Restore Smooth Shifting to Your Chevrolet Cobalt
Is your 2006-2010 Chevrolet Cobalt suffering from jarring shifts, getting stuck in gear, or throwing transmission codes? These are classic signs of a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, the TCM is responsible for every gear change. When it fails, it can make your daily drive frustrating and unreliable. This replacement T42 TCM, part number 24243901, is the definitive solution, arriving pre-programmed to your vehicle’s VIN for a seamless, plug-and-play installation.
Case Study: A Tricky Diagnosis
I once had a 2008 Cobalt in my bay that was driving the owner crazy. It would shift perfectly for days, then suddenly slam into gear or refuse to shift past 2nd. The check engine light was on with a generic P0700 code, which just tells you there’s a transmission fault. After checking the fluid and solenoids, which all looked fine, I focused on the TCM. These T42 modules, especially when exposed to years of engine heat cycles, can develop internal circuit board issues causing these intermittent problems. Swapping in a VIN-programmed module solved it instantly. The owner was back on the road with a smooth-shifting car, avoiding a costly trip to the dealership.
Is Your Cobalt Exhibiting These Symptoms?
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ 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 the dashboard.
- ✔ Your scan tool shows Diagnostic Trouble Codes (DTCs) like P0700, P0750-P0758 (solenoid circuit faults), or U-codes for lost communication.
- ✔ A noticeable decrease in fuel economy due to inefficient shifting.
- ✔ The transmission seems to slip out of gear or fails to downshift when you slow down.
A Straightforward Guide to Installation
For the 2006-2010 Cobalt TCM, the replacement process is simple enough for a DIY enthusiast. The module is typically located on the driver’s side of the engine bay, mounted to the strut tower. You can have this job done in under 30 minutes with basic hand tools.
- Safety First: Disconnect the negative terminal from your car’s battery to prevent any electrical shorts and help reset the vehicle’s computer systems.
- Locate the TCM: Open the hood and find the TCM on the driver’s side strut tower. It’s a silver box with several large electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harnesses. Then, unbolt the module from its mounting bracket. There are typically two or three bolts holding it in place.
- Install the New Module: Bolt the new, VIN-programmed TCM into place. Reconnect the wiring harnesses, ensuring they click securely into position.
- Final Steps: Reconnect the battery terminal. Start the car and let it idle for a few minutes. While our programming handles the critical data, it’s good practice to use a basic scan tool to clear any stored fault codes from the ECU.
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct replacement for a wide range of General Motors vehicles. While this page focuses on the Cobalt, it is also compatible with the following models. Please verify your part number (24243901) or contact us with your VIN to ensure perfect fitment.
- Chevrolet: Cobalt (06-10), HHR (06-11), Impala (06-11), Malibu (06-10), Monte Carlo (06-07), and many more.
- Pontiac: G5 (07-10), G6 (06-10), Grand Prix (06-08), Pursuit (06).
- Saturn: Aura (07-09), Ion (06-07), Vue (07-10).
- And other GM models including Buick, GMC, Cadillac, Hummer, and Saab from 2006-2014.
Frequently Asked Questions
Do I need to take my car to the dealer after installing this?
No. This module comes fully programmed to your vehicle’s specific VIN. It is a true plug-and-play solution, saving you the time and expense of a dealership visit for programming.
What does “TCM” stand for?
TCM stands for Transmission Control Module. It’s a dedicated computer that controls all the functions of your automatic transmission, from when to shift gears to how firmly it engages.
Will this fix a P0700 code on my Cobalt?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause (like a faulty solenoid circuit driver inside the TCM), you should ensure other components like wiring and solenoids are in good condition. In many cases, a failing TCM is the culprit.
Is this part difficult to install on a 2006-2010 Cobalt?
Not at all. The 2006-2010 Cobalt TCM is one of the more accessible modules to replace. It’s located on the driver’s side strut tower in the engine bay and requires only basic hand tools and about 20-30 minutes of your time.
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 shipping it back to us.