If your 2006-2010 Pontiac G6 is suffering from harsh shifting, getting stuck in gear, or has the check engine light on with transmission codes, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless GM vehicles, including the G6, come into the shop with these exact issues. The T42 TCM is the electronic brain of your automatic transmission, and when it fails, it creates frustrating and unpredictable driving behavior. This isn’t just an annoyance; it’s a reliability issue that can leave you stranded.
The solution is this OEM-quality T42 Transmission Control Module, a direct replacement for part number 24240400. The most significant benefit we offer is the pre-programming service. We flash the module to your vehicle’s specific VIN before it ships, which means it arrives ready for a true plug-and-play installation. You get to skip the expensive and time-consuming trip to a dealership for programming. This is the same process we use in our shop to guarantee a fast and effective repair, getting our customers back on the road safely.
From the Diagnostic Bay
I remember a 2009 Pontiac G6 that came in with a complaint of intermittent, violent shifts and occasionally getting stuck in 3rd gear (limp mode). The customer had already replaced a shift solenoid based on a code, but the problem persisted. A quick scan showed a P0700 (Transmission Control System Malfunction) and an intermittent solenoid circuit code. After 20 years of diagnostics, I know that when the symptoms don’t perfectly match the codes, it’s often the controller itself. We checked the wiring for integrity, and it was fine. The culprit was an internally failing TCM that was sending faulty commands. Swapping in a VIN-programmed module like this one resolved all the issues in under an hour, without any further diagnostics needed.
Is Your Pontiac G6 Showing These Signs?
- ✔️ Unpredictable, harsh, or delayed gear shifts.
- ✔️ The vehicle is stuck in “limp mode” and won’t shift out of a single gear.
- ✔️ Check Engine Light or Transmission Warning Light is illuminated.
- ✔️ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- ✔️ A sudden drop in fuel economy or a feeling of sluggish performance.
- ✔️ Complete loss of communication with the transmission module.
DIY-Friendly Installation: Get Your G6 Shifting Smoothly
For the Pontiac G6, this is a straightforward repair that most DIY enthusiasts can handle in their own driveway. The TCM is typically located at the driver’s side strut tower in the engine bay.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: Find the TCM on the driver’s side (LH) strut tower. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the wiring harnesses.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic scan tool to clear any stored fault codes from the ECU.
Verified Fitment for Your Vehicle
This module is a confirmed fit for the 2006-2010 Pontiac G6. It is also compatible with a wide range of other General Motors vehicles that use the T42 TCM. Please verify your part number or contact us with your VIN to ensure perfect compatibility. This module interchanges with several part numbers, including 24252114, 24234503, 24239926, and 24240400.
Frequently Asked Questions
Do I need to take this part to the dealer for programming?
No. This is the biggest advantage of our product. We program the module to your vehicle’s VIN before shipping, so it’s ready to install right out of the box. This saves you hundreds of dollars in dealership fees.
What tools are required for installation on a Pontiac G6?
You’ll only need basic hand tools. A socket set to remove the mounting bolts and a flathead screwdriver to help release the connector clips are typically all that’s necessary. The entire job should take less than 30 minutes.
Will this 2006-2010 G6 Transmission Module fix a P0700 code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause (the faulty TCM itself), you should ensure there are no underlying wiring or solenoid issues. In many cases, a new module is the correct fix.
Is there a core charge for my old part?
No, we do not require a core charge. You can keep your old part, which simplifies the process and saves you the hassle and cost of return shipping.
What kind of warranty is included?
This module comes with a one-year warranty, giving you peace of mind and confidence in your repair.