Restore Smooth Shifting to Your Chevy Cobalt
If your 2006-2010 Chevrolet Cobalt is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, the problem is often not the transmission itself, but its electronic brain: the Transmission Control Module (TCM). Over my 20+ years in automotive diagnostics, I’ve seen countless drivers worry about a costly transmission rebuild when the real culprit was a failing T42 TCM. This VIN-programmed replacement, part number 24234503, is the direct-fit, reliable solution to get your Cobalt driving like new again without a trip to the dealership for programming.
This module is the command center for your automatic transmission. It precisely controls shift points, torque converter lockup, and line pressure based on data from your engine and speed sensors. When it fails, communication breaks down, leading to the frustrating and sometimes dangerous symptoms you’re experiencing. Our module arrives pre-programmed to your vehicle’s specific VIN, ensuring it works seamlessly with your car’s systems right out of the box. This is a critical step that eliminates the need for expensive dealer-only tools and labor, saving you time and money.
A Technician’s Notebook: The Cobalt That Wouldn’t Shift
A customer brought in a 2008 Cobalt complaining it felt like it was “stuck in mud” and the check engine light was on. The car wouldn’t shift past 2nd gear—a classic limp mode symptom. A quick scan pulled a P0700 (Transmission Control System Malfunction) and a P0752 (Shift Solenoid ‘A’ Stuck On). The owner was convinced his transmission was shot. Before quoting a massive repair, I checked the basics. The fluid was clean, and the wiring to the TCM was intact. Knowing these T42 modules are a common failure point, we swapped in a VIN-programmed unit. After a 15-minute install and clearing the codes, the car shifted perfectly on the test drive. The issue was never mechanical; it was a faulty module sending bad commands. This simple part replacement saved the customer over a thousand dollars and a lot of unnecessary stress.
Is Your Cobalt’s Transmission Acting Up?
A failing TCM can mimic serious mechanical issues. Look for these common warning signs before assuming the worst:
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ Vehicle is stuck in a single gear (limp mode), often 2nd or 3rd.
- ✔ Illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750-P0758, or other solenoid-related faults.
- ✔ Inability to upshift or downshift properly.
- ✔ A sudden drop in fuel economy.
- ✔ The transmission seems to slip out of gear.
Replacing your faulty module with this quality part is the definitive fix for these electronic issues, restoring the performance and reliability of your 2006-2010 Cobalt TCM.
A Straightforward Guide to Installation
Designed for the DIYer and professional alike, this installation can be completed in your driveway with basic hand tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the system.
- Locate the Module: On the Chevrolet Cobalt, the TCM is typically found on the driver’s side, mounted to the LH strut tower.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new, VIN-programmed module in place and tighten the bolts. Reconnect the electrical harnesses, ensuring they click securely into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. If you have a basic OBD2 scanner, it’s good practice to clear any stored codes. Take the vehicle for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility List
This T42 TCM is a direct replacement for part number 24234503 and other service numbers. While this page focuses on the 2006-2010 Cobalt TCM, this module fits a wide range of GM vehicles. Please verify your model and location below:
- CHEVROLET COBALT (2006-2010): Transmission; (LH strut tower)
- CHEVROLET HHR (2006-2011): Transmission; (LH engine compartment)
- PONTIAC G5 (2007-2010): Transmission; (LH strut tower)
- PONTIAC G6 (2006-2010): Transmission; (LH strut tower)
- SATURN ION (2006-2007): Transmission; (behind LH strut tower)
- And many other GM models including trucks, vans, and SUVs. Please see the full fitment list provided in the product details.
Frequently Asked Questions
What exactly is VIN programming?
VIN programming means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) onto the module before shipping. This ensures the TCM has the correct software and calibration for your Cobalt’s specific transmission and options, making it a true plug-and-play part.
Do I need to take my car to a dealer after installation?
No. Because this module is pre-programmed to your VIN, you do not need any additional programming from a dealership or mechanic. This saves you a significant amount of time and money.
Is this a new or used part?
This is a high-quality, OEM-standard replacement part, inspected and programmed to ensure reliability and performance. It is backed by our one-year warranty for your peace of mind.
Will this fix a P0700 code?
A P0700 is a generic code indicating the TCM has detected a fault. Often, replacing a faulty TCM will resolve the P0700 and any related specific codes (like for solenoids). However, you should always ensure the wiring and transmission components are in good condition.
What if I order the wrong part?
We’re here to help! Please double-check the fitment list or contact us with your VIN before ordering. Our team of experts can verify compatibility to ensure you get the right part the first time.