Is Your Pontiac G6 Shifting Erratically?
If you’re dealing with harsh shifting, a check engine light that won’t go away, or your 2006-2010 Pontiac G6 is stuck in limp mode, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for every gear change and torque converter operation. When it fails, it can make your car feel unpredictable and unsafe to drive. This T42 Transmission Control Module, part number 24239926, is the definitive, plug-and-play solution to restore your vehicle’s performance and your peace of mind.
We had a 2008 Pontiac G6 come into the shop that the owner was about to give up on. It would slam into gear from a stop and sometimes refuse to shift past 2nd gear, making highway driving impossible. The dash was lit up with a check engine light and a transmission warning. A quick scan showed a P0700 (Transmission Control System Malfunction) and several solenoid circuit codes. Instead of chasing down individual solenoids, our experience pointed directly to the common failure point: the TCM. After installing one of our VIN-programmed T42 modules, the car shifted like it just rolled off the factory floor. All codes were cleared, and the customer was thrilled to have their reliable car back without an expensive dealership bill.
The Plug-and-Play Advantage: Pre-Programmed for Your G6
Forget about costly dealership visits for programming and calibration. We handle the complex part for you. Before we ship your module, we program it with your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software updates. This ensures that the module communicates flawlessly with your car’s engine computer and other systems right out of the box. This critical step eliminates compatibility issues and resolves common diagnostic trouble codes (DTCs) that generic, non-programmed modules can’t fix. It’s a true plug-and-play repair.
Symptoms of a Failing 2006-2010 G6 TCM
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ Vehicle gets stuck in one gear (limp mode).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults are present.
- ✔ The transmission fails to upshift or downshift properly.
- ✔ A noticeable decrease in fuel economy.
- ✔ Intermittent loss of communication with the scan tool.
Installation and Compatibility
Replacing the TCM on your Pontiac G6 is a straightforward job that can be done in your own garage in under 30 minutes. The module is typically located on the driver’s side, attached to the strut tower. Simply disconnect the negative battery terminal, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect everything, and you’re ready to go. This module is a direct replacement for a wide range of service numbers, including 24252114, 24234503, 24239926, and more, ensuring broad compatibility across the GM lineup. With our module, there is no core charge, so you can keep your old part without any hassle.
Frequently Asked Questions
What does VIN programming do for my G6?
VIN programming loads your car’s specific software onto the TCM. This ensures the module understands your vehicle’s engine, tire size, and gear ratios, allowing for precise shift points and optimal performance. It makes the installation plug-and-play, avoiding the need for expensive dealership tools.
Will this fix my specific transmission problem?
This module is the solution for failures of the transmission’s electronic controls. If you are experiencing symptoms like erratic shifting, limp mode, or TCM-related error codes (like P0700), this part is designed to resolve those issues. It does not fix internal mechanical failures like a broken clutch or band.
Is this an OEM part?
This is a high-quality replacement part built to meet or exceed original equipment manufacturer (OEM) standards for performance and durability. It is designed to be a direct-fit replacement for the original GM T42 module.
Do I need to perform a transmission relearn procedure?
Because our modules come pre-programmed with the latest GM software, a full relearn procedure is typically not required. After installation, the module will self-adapt to your driving style within a few drive cycles. We do recommend clearing any old codes with a standard scan tool after installation.
Where is the TCM located on my 2006-2010 Pontiac G6?
On the Pontiac G6, the Transmission Control Module is conveniently located in the engine bay, typically mounted to the driver’s side (LH) strut tower, making it easily accessible for replacement.