Restore Your Grand Prix’s Smooth, Confident Performance
Is your 2006-2008 Pontiac Grand Prix suffering from jarring shifts, getting stuck in gear, or flashing a dreaded check engine light? These are classic signs of a failing Transmission Control Module (TCM), the electronic brain of your automatic transmission. When it falters, your driving experience becomes stressful and unpredictable. This isn’t just an annoyance; it’s a critical component failure that can lead to further transmission damage if ignored. We offer the definitive solution: a high-quality T42 TCM, service part number 24255280, pre-programmed specifically to your vehicle’s VIN. Forget the expensive dealership visit and the hassle of programming tools. This module is ready to install right out of the box, putting you back in control and restoring the reliable performance you depend on.
Is Your Grand Prix Showing These Telltale Signs?
A failing TCM can manifest in several frustrating ways. If you’re experiencing any of the following, it’s highly likely this module is the culprit. Addressing it now can save you from more costly repairs down the road.
- ✔ Abrupt, harsh, or erratic gear changes that make driving uncomfortable.
- ✔ The vehicle enters “limp mode,” often stuck in 2nd or 3rd gear, with limited power.
- ✔ Your dashboard is lit up with a Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic scans reveal trouble codes like P0700 (Transmission Control System Malfunction), P0750, or other solenoid-related faults.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable drop in fuel economy as the transmission operates inefficiently.
The Direct-Fit Solution for Lasting Confidence
Our commitment is to provide a part that not only fixes the problem but also delivers lasting peace of mind. This module is engineered to meet or exceed original GM specifications, ensuring a seamless integration with your vehicle’s systems.
- ✔ VIN-Programmed for You: We program the module with your vehicle’s unique VIN and the latest GM software updates before it ships. This ensures perfect communication between the engine and transmission for optimal shift strategy and fuel efficiency, with no extra steps required.
- ✔ Plug-and-Play Simplicity: Because it’s pre-programmed, this 2006-2008 Grand Prix TCM is a true plug-and-play part. Simply disconnect the old module and connect the new one.
- ✔ Restored Drivability: Experience the return of smooth gear transitions, predictable acceleration, and the quiet, efficient operation you expect from your Pontiac.
- ✔ Quality You Can Trust: Built with durable components to withstand the harsh environment of the engine bay, this module is backed by our one-year warranty for your protection.
From the Technician’s Bench
“A customer brought in his ’07 Grand Prix with a classic case of ‘limp mode.’ He was frustrated, thinking he was facing a multi-thousand dollar transmission rebuild. The dealership had quoted him over $1200 for a new TCM and programming. After a quick scan confirmed a faulty module, we installed one of our pre-programmed units. In less than an hour, he was back on the road, shifting perfectly. He saved a significant amount of money and, more importantly, regained the confidence that his car was reliable again. That’s the power of a smart, direct-fit solution.”
Your Straightforward Path to a Perfect Shift
You don’t need to be a master mechanic to complete this installation. With basic hand tools and about 30 minutes, you can have your Grand Prix running smoothly again. For the 2006-2008 Grand Prix, the TCM is conveniently located in the lower air cleaner housing.
- Safety First: Begin by disconnecting the negative terminal of your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Locate and Access: Find the air cleaner housing in the engine bay. You will likely need to remove the air filter and part of the housing to access the old TCM mounted below it.
- Disconnect the Module: Carefully unplug the electrical connectors from the old TCM. There are typically release tabs that you’ll need to press or lift. Avoid pulling on the wires themselves.
- Remove the Old TCM: Unbolt the module from its mounting bracket. Keep the hardware, as you may need to reuse it for the new module.
- Install the New Module: Mount your new, pre-programmed 2006-2008 Grand Prix TCM in place of the old one and secure it with the original hardware.
- Reconnect and Reassemble: Firmly plug the electrical connectors into the new module until they click into place. Reassemble the air cleaner housing and reconnect the battery terminal.
- Final Steps: Start the vehicle. While the module is plug-and-play, it’s a good practice to use a basic OBD2 scanner to clear any lingering fault codes from the computer’s memory. Take your car for a test drive to enjoy the restored performance!
Confirmed Fitment for Your Vehicle
This T42 TCM is a direct replacement for a wide range of General Motors vehicles. While this page is focused on the Pontiac Grand Prix, it is also compatible with the following models. Please verify your part number (24255280 or an interchange number like 24252114, 24234503) for a perfect match.
Fits Models Including: Pontiac Grand Prix (2006-2008), Chevrolet Impala (2006-2011), Buick LaCrosse (2006-2009), Chevrolet Silverado, GMC Sierra, Chevrolet Tahoe, GMC Yukon, and many more vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E.
Frequently Asked Questions
Do I need to take my car to a dealer for programming?
Absolutely not. We handle all the programming before the part is shipped to you. Just provide your vehicle’s VIN during checkout, and the module will arrive ready for immediate installation, saving you time and money.
Is this a difficult part to install myself?
For most DIYers with basic tools, this is a very manageable job. On the 2006-2008 Grand Prix, the TCM is located under the air cleaner box, making it accessible. Our step-by-step guide above should give you the confidence to complete the repair in under an hour.
What is a core charge and do you require one?
A core charge is a deposit that is refunded when you send back your old part. We do not have a core charge on this module, so you can keep your old part without any hassle or extra steps.
Will this fix a P0700 trouble code?
Yes, in most cases. The P0700 code is a general fault code indicating the TCM has detected a problem. Replacing a faulty TCM is often the correct and final solution to clear this code and the underlying specific codes it has stored.
What happens after I install the new TCM?
After installation and reconnecting the battery, start the vehicle. It may take a short drive for the new module to fully sync with your vehicle’s systems. We recommend clearing any old codes with a scan tool for a clean slate. You should immediately notice smoother shifting and restored performance.