Is Your Grand Prix Shifting Erratically?
If your 2006, 2007, or 2008 Pontiac Grand Prix is suffering from harsh shifting, delayed gear engagement, or 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 orchestrating every gear change and ensuring smooth, efficient operation. When it fails, it can cause a cascade of frustrating and potentially damaging issues, from poor fuel economy to a complete loss of drivability. This VIN-programmed T42 TCM is the definitive solution to restore your vehicle’s performance and get you back on the road with confidence.
From the Diagnostic Bay
We had a 2007 Grand Prix come in with the check engine light on and a P0700 code. The owner had already spent a small fortune replacing shift solenoids based on a generic code reader’s suggestion, but the harsh 1-2 shift and delayed engagement into drive persisted. After a quick scan with professional equipment, we confirmed the internal logic of the original TCM was faulty. Instead of another expensive guess, we installed one of our VIN-programmed T42 modules. The installation took less than 30 minutes, and on the first test drive, the car shifted perfectly. It’s a classic case where targeting the root cause—the module itself—saves time, money, and a lot of headaches.
Symptoms of a Failing Grand Prix TCM
- ✔️ Harsh, slamming, or erratic gear shifts.
- ✔️ Vehicle gets stuck in a single gear (limp mode), often 2nd or 3rd.
- ✔️ Check Engine Light or Transmission Warning Light is illuminated on the dash.
- ✔️ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults are present.
- ✔️ Delayed or no engagement when shifting from Park to Drive or Reverse.
- ✔️ Poor acceleration and a noticeable decrease in fuel efficiency.
- ✔️ The torque converter fails to lock up at highway speeds, causing high RPMs.
The Direct-Fit Solution: A VIN-Programmed Replacement
Don’t settle for a generic part that requires an expensive trip to the dealership for programming. Our T42 Transmission Control Module arrives at your door completely pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN). This crucial step ensures that the module communicates flawlessly with your Grand Prix’s engine computer and other systems right out of the box. We load the latest GM software updates, which often correct factory flaws and improve transmission behavior. This is a true plug-and-play repair that eliminates compatibility issues and restores your transmission’s original performance and reliability.
Key Features & Benefits
- ✔️ Plug & Play Installation: Pre-programmed with your car’s VIN, this module requires no additional dealership flashing or setup. Simply install it and go.
- ✔️ Restores Smooth Shifting: Corrects issues like hard shifts, slipping, and delayed engagement by precisely controlling solenoids and hydraulic pressure.
- ✔️ OEM-Standard Quality: Built to meet or exceed original equipment specifications for durability and long-term performance, backed by a one-year warranty.
- ✔️ Cost-Effective Repair: Avoids the high costs and scheduling hassles of dealership programming, saving you significant time and money.
- ✔️ Broad Interchangeability: This module replaces a wide range of part numbers, including 24252114, 24234503, 24230461, 24240400, and more, ensuring a perfect match.
Installation Information
For the 2006-2008 Pontiac Grand Prix, the TCM is conveniently located under the lower air cleaner housing, making it accessible for a straightforward replacement. The process typically takes under 30 minutes. Always disconnect the vehicle’s battery before beginning the installation to prevent electrical damage and help reset the vehicle’s internal systems. After installing the new module, reconnect the battery and use a standard OBD2 scan tool to clear any stored fault codes. With no core charge, you can keep your old part without any hassle.
Frequently Asked Questions
What does ‘VIN-programmed’ actually mean for my Grand Prix TCM?
It means we flash the module with the specific software and calibrations for your exact vehicle using your VIN. This makes the module a direct plug-and-play part, ensuring it works perfectly with your engine and transmission without any need for further programming at a dealership.
Can I install this module myself?
Yes, this is a very DIY-friendly repair for those with basic mechanical skills. On the Grand Prix, the TCM is located under the air cleaner box. The process involves disconnecting the battery, removing the airbox, unplugging the old module, and installing the new one. It typically takes less than 30 minutes.
Will this part fix my P0700 transmission code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause of a P0700 and related specific codes (like solenoid faults), you should always ensure other components like wiring and solenoids are in good condition. However, a faulty module is the most common cause.
Is there a core charge or do I need to return my old part?
No, there is absolutely no core charge. You are not required to send your old, faulty module back to us, which simplifies the process for you.
How can I be sure this fits my vehicle?
This module is guaranteed to fit 2006-2008 Pontiac Grand Prix models. It is also a direct replacement for numerous other GM vehicles. You can confirm fitment by matching your original part number to the list of interchangeable numbers provided, or by using our website’s vehicle selector.