Restore Peak Performance to Your Pontiac Grand Prix
If your 2006, 2007, or 2008 Pontiac Grand Prix is suffering from erratic shifting, getting stuck in gear, or displaying transmission-related error codes, a failing Transmission Control Module (TCM) is the most likely culprit. This vital electronic component is the brain of your automatic transmission, responsible for every gear change and torque converter operation. When it fails, it can mimic serious mechanical issues, leading to frustrating and costly misdiagnoses. This replacement T42 TCM, part number 24235340, is the definitive solution to restore the smooth, reliable performance your vehicle had when it was new.
From the Diagnostic Bay
We recently had a 2007 Grand Prix come into the shop with classic symptoms of a failing transmission—harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode). The owner was convinced he needed a complete transmission rebuild, a multi-thousand dollar job. Before tearing anything down, we pulled the codes and saw a P0753 (Shift Solenoid ‘A’ Electrical). While this can point to a solenoid, experience with these platforms told us to check the TCM first. We swapped in one of our VIN-programmed modules, cleared the codes, and took it for a test drive. The shifting was immediately crisp and smooth. The issue was never the internal mechanics; it was the electronic controller. This simple replacement saved the customer thousands of dollars and significant vehicle downtime.
The Ultimate Solution: A Pre-Programmed Grand Prix Transmission Module
Dealerships and many repair shops will tell you that a new TCM requires a complicated and expensive programming session with specialized equipment after installation. Our process eliminates that step entirely. We pre-program this module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures that it arrives loaded with the correct factory software and calibrations for your Grand Prix’s exact configuration. The result is a true plug-and-play installation that you or your mechanic can perform quickly, getting you back on the road without a trip to the dealer.
Symptoms of a Faulty 2006-2008 Grand Prix TCM
- ✔ Unpredictable or harsh shifting between gears.
- ✔ The vehicle feels like it’s stuck in one gear (limp mode).
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ Illumination of the Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ A noticeable decrease in fuel economy.
- ✔ Complete loss of communication with the transmission.
This module is a direct replacement for a wide range of GM vehicles utilizing the 4-speed automatic transmissions (like the 4L60E, 4L65E, and 4L70E) and is interchangeable with numerous service numbers, including 24252114, 24234503, 24230461, and 24235340. By replacing your old, failing Grand Prix Transmission Module, you are not just fixing a symptom; you are restoring the core logic that governs your vehicle’s drivability and efficiency.
Easy Installation for DIYers and Professionals
For the 2006-2008 Pontiac Grand Prix, the TCM is conveniently located under the lower air cleaner housing, making it accessible for replacement. The entire process typically takes less than an hour. Simply disconnect the battery, remove the air cleaner assembly to gain access, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Once the new module is connected and the battery is reconnected, the vehicle is ready to go. We recommend using a basic scan tool to clear any stored DTCs after the installation is complete for a clean slate.
Frequently Asked Questions
What does “VIN Programmed” actually mean?
It means we flash the module with your car’s specific factory software using your 17-digit VIN. This ensures the TCM communicates perfectly with your vehicle’s engine computer and other systems, just like the original part did. No extra programming is needed.
Will this module fit vehicles other than the Grand Prix?
Yes, this T42 TCM is compatible with a vast range of 2006-2014 GM vehicles, including models like the Impala, LaCrosse, Silverado, Tahoe, and many more that use a 4-speed automatic transmission. The VIN programming ensures it works correctly for your specific application.
Is this a difficult part to install myself?
For most individuals with basic mechanical skills and tools, this is a straightforward installation. On the Grand Prix, it’s located under the air cleaner box. Disconnecting the battery and swapping the module is a simple process that typically takes under an hour.
Do I need to send my old TCM back?
No, there is absolutely no core charge for this part. You can keep your old module, recycle it, or dispose of it at your convenience without any extra fees or hassle.
What if this doesn’t fix my problem?
While this module corrects the most common transmission electronic failures, we understand vehicle diagnostics can be complex. This part is backed by a one-year warranty. If you continue to have issues, our expert support team is available to help you troubleshoot further.