Restore Your Grand Prix’s Shifting Performance
Is your 2006, 2007, or 2008 Pontiac Grand Prix suffering from erratic shifting, getting stuck in gear, or displaying a check engine light? These are classic signs of a failing Transmission Control Module (TCM). 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 vehicle unreliable and frustrating to drive. This genuine GM T42 TCM, service number 24234503, is the definitive solution to restore your transmission’s smooth, factory-new operation.
We had a 2007 Buick LaCrosse (which uses the same T42 module) come into the shop with a persistent P0700 code and harsh, unpredictable shifts. The owner had already replaced two shift solenoids with no improvement. After a quick scan, we saw erratic data from the TCM. Instead of a costly transmission rebuild, we installed a VIN-programmed T42 module. The car immediately shifted perfectly on the test drive, and all transmission codes were gone. It’s a reminder that what often seems like a major mechanical failure is actually an electronic one that a new TCM can solve.
Signs Your T42 Transmission Module is Failing
A faulty TCM can manifest in various ways, often mimicking internal transmission problems. If you’re experiencing any of the following, your TCM is the likely culprit:
- ✔ Harsh, delayed, or erratic gear shifts that make driving uncomfortable.
- ✔ The vehicle enters “limp mode,” often getting stuck in 2nd or 3rd gear.
- ✔ An illuminated Check Engine Light or Transmission Warning Light on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults.
- ✔ The transmission refuses to upshift or downshift correctly, leading to poor acceleration.
- ✔ A noticeable decrease in fuel economy due to inefficient transmission operation.
- ✔ Complete failure to engage gears from Park, Neutral, or Drive.
The Solution: A VIN-Programmed 2006-2008 Grand Prix TCM
Don’t settle for a generic, unprogrammed module that requires an expensive trip to the dealership. Our T42 TCMs are meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN) before they ship. This critical step ensures 100% compatibility with your Grand Prix’s powertrain and software. The module arrives ready for a true plug-and-play installation, loaded with the latest GM software updates to ensure optimal performance and longevity. This process resolves common software-related DTCs and shifting issues right out of the box, saving you hundreds in programming fees and diagnostic time.
Built to strict OEM standards, this module is an exact replacement for service numbers including 24234503, 24242391, and 24252114. It is designed to provide years of reliable service, controlling all critical transmission functions for smoother gear changes, improved fuel efficiency, and a worry-free driving experience. Installation is straightforward for a DIY mechanic or any professional technician. For the 2006-2008 Grand Prix, the TCM is typically located under the lower air cleaner housing, making it accessible in the engine bay. Simply disconnect the battery, swap the modules, reconnect the battery, and clear any stored codes with a basic scan tool.
Frequently Asked Questions
What does a VIN-programmed TCM mean?
It means we flash the module with your vehicle’s specific factory software using your VIN. This ensures the TCM communicates perfectly with your car’s engine computer and other systems, eliminating the need for additional programming at a dealership.
Do I need to take my car to a dealer after installing this?
No. Because the module is pre-programmed to your VIN, it is a plug-and-play installation. You will not need to visit a dealer or mechanic for programming, saving you time and money.
Where is the TCM located on a 2006-2008 Grand Prix?
On the 2006-2008 Pontiac Grand Prix, the Transmission Control Module is typically found in the engine compartment, located in the lower air cleaner housing.
Will this fix a P0700 trouble code?
The P0700 code is a general transmission fault code, indicating that the TCM has detected a problem. In many cases, a failing TCM is the root cause of this code. Replacing it with our programmed module is a very common and effective fix for a P0700 and related transmission codes.
Is there a core charge for this part?
No, we do not require a core charge. You can keep your old part without the hassle of returning it, making the replacement process even simpler.