Restore Flawless Shifting to Your Pontiac Grand Prix
If your 2006-2008 Pontiac Grand Prix is suffering from harsh shifts, getting stuck in gear, or throwing transmission codes, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As a seasoned technician, I’ve seen countless GM vehicles, especially the Grand Prix, come into the shop with these exact issues. The T42 TCM is the electronic brain of your automatic transmission, and when it fails, it creates frustrating and potentially unsafe driving conditions. This replacement module, part number 24235753, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
Case Study: A Tricky Diagnosis
A customer brought in a 2007 Grand Prix GXP with what they thought was a completely shot transmission. It was banging into gear and occasionally wouldn’t shift past 2nd. Another shop had quoted them over $2,500 for a transmission rebuild. I hooked up my scan tool and immediately saw a P0700 (Transmission Control System Malfunction) and several solenoid circuit codes. Instead of tearing into the transmission, I checked the TCM. After swapping in a VIN-programmed module like this one, the car shifted like it just rolled off the factory floor. This simple, 30-minute fix saved the customer thousands and solved a problem that looked much worse than it was. This is why diagnosing the electronics first is critical.
Is Your Grand Prix Showing These Telltale Signs?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution for your 2006-2008 Grand Prix TCM issues:
- ✔ Harsh, slamming shifts or erratic gear changes.
- ✔ The vehicle feels like it’s stuck in one gear (limp mode).
- ✔ Your 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.
- ✔ A sudden drop in fuel economy.
A Straightforward Guide to Your TCM Replacement
One of the best features of this part is its simple installation. For the Pontiac Grand Prix, the TCM is conveniently located under the lower air cleaner housing, making it accessible for any DIY enthusiast. You can have your car back to normal in under 30 minutes.
- Safety First: Disconnect the negative terminal on your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Access the Module: Remove the air cleaner box assembly to expose the TCM mounted below it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place. Securely reconnect the electrical connectors—they should click into place.
- Reassemble and Test: Reinstall the air cleaner assembly and reconnect the battery terminal. Start the vehicle and take it for a test drive to confirm that shifting is smooth and responsive. Any stored codes should be cleared.
Verified Fitment for Your General Motors Vehicle
While this is the correct 2006-2008 Grand Prix TCM, this T42 module is also compatible with a wide range of other GM cars, trucks, and SUVs. It is a direct replacement for part numbers including 24235753, 24242391, 24252114, 24234503, and more. Please verify your vehicle in the list below:
Partial Fitment List:
- 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 Silverado / GMC Sierra 1500/2500: 2007-2013 (Transmission; next to battery)
- Chevrolet Tahoe / GMC Yukon: 2007-2009 (Transmission; next to battery)
- And many more…
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM software onto the module before shipping. This ensures it communicates perfectly with your car’s engine computer and other systems right out of the box, eliminating the need for expensive dealership programming.
Do I need any special tools for this installation?
No special tools are required. Basic hand tools like a socket set and screwdriver to remove the air cleaner assembly are all you’ll need.
Will this fix my P0700 check engine light code?
Yes, in most cases. A P0700 code is a general fault code indicating the TCM has detected a problem. Replacing a faulty TCM with this pre-programmed unit is the direct fix for the root cause of that code and related transmission faults.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module, so you don’t have to worry about the hassle and expense of shipping it back.