Is your 2006-2010 Chevrolet Cobalt suffering from harsh, erratic shifting or getting stuck in gear? A failing Transmission Control Module (TCM) is one of the most common culprits behind these frustrating and potentially damaging issues. Over my 20 years in automotive diagnostics, I’ve seen countless GM vehicles, including the Cobalt, exhibit these exact symptoms due to a faulty TCM. This T42 module, part number 24235754, is the definitive solution, arriving fully programmed to your vehicle’s specific VIN for a true plug-and-play repair.
The TCM is the brain of your automatic transmission, controlling everything from shift points to torque converter lockup. When it fails, communication breaks down, leading to poor performance, decreased fuel economy, and the dreaded check engine light. Our replacement 2006-2010 Cobalt TCM is built to strict OEM standards, ensuring it restores the precise electronic control your transmission needs. By programming it with the latest GM software updates before it ships, we eliminate the need for an expensive and time-consuming trip to the dealership, saving you time and money.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Cobalt that would intermittently get stuck in 3rd gear (limp mode) with a P0700 code. They had already replaced a shift solenoid with no luck. After connecting my scan tool, I noticed the data stream from the TCM was dropping out randomly. Heat from the engine compartment is a major stressor on these modules. We installed one of our VIN-programmed T42 modules, and the problem was solved instantly. The key was that the new module was ready to go right out of the box, making the repair fast and efficient—a perfect first-time fix.
Common Signs of a Failing Cobalt TCM
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ Vehicle is stuck in one gear, often referred to as “limp mode.”
- ✔ The check engine light is on with transmission-related Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid circuit faults.
- ✔ Inability to shift up or down, leading to poor acceleration and high RPMs.
- ✔ A noticeable drop in fuel efficiency.
- ✔ Intermittent loss of communication with the module, causing unpredictable behavior.
Your 30-Minute Path to a Smooth Ride
Installing your new 2006-2010 Cobalt TCM is a straightforward job for any DIY enthusiast or professional. In most Cobalts, the module is easily accessible.
- 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’ll typically find the TCM mounted on the LH (driver’s side) strut tower in the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a socket wrench to remove the mounting bolts holding the old module in place.
- Install the New Module: Mount the new, pre-programmed TCM in the same location and secure it with the bolts. Reconnect the electrical harnesses firmly.
- 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.
Confirmed Vehicle Compatibility List
This T42 TCM (interchangeable with part numbers 24234503, 24252114, 24235754, and more) is a direct-fit replacement for a wide range of GM vehicles. While this page focuses on the 2006-2010 Cobalt TCM, it also fits the following models. Please verify your specific model and location notes.
- Chevrolet Cobalt: 2006-2010 (LH strut tower)
- Chevrolet HHR: 2006-2011 (LH engine compartment)
- Chevrolet Impala: 2006-2011 (lower air cleaner housing)
- Pontiac G5 / G6: 2006-2010 (LH strut tower)
- Saturn Ion: 2006-2007 (behind LH strut tower)
- And many more GM cars, trucks, and SUVs. See the full fitment list for details.
Frequently Asked Questions
What does “VIN Programmed” actually mean?
It means we load your vehicle’s unique Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your car’s engine computer and other systems right out of the box, with no need for dealership tools.
Do I need any special tools for this installation?
No. Basic hand tools, like a socket set to remove the mounting bolts, are all that’s required. The entire process typically takes less than 30 minutes.
Is there a core charge for my old part?
Absolutely not. We don’t require you to send back your old, faulty module. You can keep it or dispose of it at your convenience, making the process hassle-free.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request from the TCM to the main engine computer. While this module often resolves the underlying cause of a P0700, it’s crucial to check for other specific codes (like P0750-P0758 for solenoids) to confirm the TCM is the root problem. In many cases, a failing TCM is the direct cause.
What happens if I continue driving with a bad TCM?
Continuing to drive with a failing TCM can cause more than just poor performance. It can lead to excessive wear on your transmission’s internal components, like clutches and bands, due to improper fluid pressure and shifting. This can turn a relatively simple electronic repair into a major mechanical one.