Restore Crisp, Reliable Shifting to Your Pontiac Grand Prix
Are you tired of dealing with unpredictable shifting, a car that’s stuck in gear, or a persistent check engine light? A failing Transmission Control Module (TCM) is one of the most common culprits behind these frustrating issues in 2006-2008 Pontiac Grand Prix models. Over the years in the shop, I’ve seen countless GM vehicles with these T42 modules develop internal faults, leading to everything from harsh gear changes to a complete loss of communication. This isn’t just an annoyance; it’s a safety concern. This direct-replacement TCM, part number 24235732, is the definitive solution to restore your transmission’s performance and your confidence on the road.
The core of the problem often lies in the complex electronics that manage your automatic transmission. This module is the brain, controlling hydraulic pressure, shift points, and torque converter lockup. When it fails, the transmission doesn’t get the right signals, resulting in poor performance and potential long-term damage. Our solution provides a reliable, pre-programmed part that communicates flawlessly with your vehicle’s systems right out of the box, eliminating the need for expensive dealership visits for programming.
From the Diagnostic Bay
I remember a 2007 Grand Prix that came in with a complaint of intermittent, bone-jarring shifts from 1st to 2nd gear, but only after it was fully warmed up. The owner had already replaced a shift solenoid with no luck. We scanned it and found a generic P0700 code. After ruling out wiring issues, we focused on the TCM. Experience has taught me that heat-related failures are classic signs of a failing T42 module. We swapped in one of our VIN-programmed units, and the problem was gone instantly. The customer was thrilled to have his smooth-shifting car back without the dealership hassle.
Is Your Grand Prix Showing These Telltale Signs?
If you’re experiencing any of the following, a faulty TCM is the likely cause. Replacing your 2006-2008 Grand Prix TCM can resolve these issues:
- ✔ Harsh, slamming, or erratic gear shifts.
- ✔ The vehicle gets stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults are present.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ Failure to upshift or downshift properly, leading to poor acceleration.
- ✔ A noticeable drop in fuel economy.
Your Straightforward Grand Prix TCM Installation Guide
This is a repair you can confidently handle in your own garage. For the 2006-2008 Grand Prix, the TCM is conveniently located, making for a quick swap.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic work.
- Locate the Module: On your Grand Prix, the TCM is typically found underneath the air cleaner housing in the engine bay. You will need to remove the airbox to access it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new module securely in place and reconnect the electrical harnesses. Ensure they click into place.
- Final Steps: Reinstall the air cleaner housing and reconnect the battery. While our programming handles the critical setup, it’s always a good practice to use a basic scan tool to clear any stored DTCs from the system.
Verified Fitment for Your General Motors Vehicle
While this is the correct part for your 2006-2008 Grand Prix TCM replacement, this T42 module is also compatible with a wide range of other GM vehicles. It is a direct interchange for part numbers including 24252114, 24234503, 24235732, and others. Please verify your vehicle in the list below or contact us with your VIN for guaranteed fitment.
- Pontiac Grand Prix (2006-2008) – Transmission; (lower air cleaner housing)
- Chevrolet Impala (2006-2011) – Transmission; (lower air cleaner housing)
- Buick LaCrosse / Allure (2006-2009) – Transmission; (lower air cleaner housing)
- Chevrolet Monte Carlo (2006-2007) – Transmission; (lower air cleaner housing)
- Chevrolet & GMC Trucks/SUVs (Various 2007-2013) – Transmission; (next to battery)
- And many more GM models…
Frequently Asked Questions
Do I need to take my car to the dealer after installation?
No. This Transmission Control Module comes fully programmed to your vehicle’s specific VIN. This makes it a true plug-and-play solution, saving you the time and expense of a dealership visit.
Is this a new or used part?
This is a high-quality, OEM-spec replacement part that has been expertly programmed and tested to meet or exceed original performance standards. It is backed by our one-year warranty for your peace of mind.
What is a core charge?
There is no core charge for this part. You are not required to send your old, faulty module back to us, which simplifies the repair process for you.
Will this fix my P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a faulty TCM is a very common cause, this code can also be triggered by other transmission issues. However, if you’re experiencing the shifting symptoms listed above along with the code, replacing the TCM is the most likely fix.