Restore Smooth Shifting to Your Pontiac Grand Prix
If you’re dealing with the frustration of a 2006-2008 Pontiac Grand Prix that shifts harshly, gets stuck in gear, or throws transmission-related check engine lights, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As an experienced technician, I’ve seen countless GM vehicles, including the Grand Prix, suffer from these exact issues. The TCM is the brain of your automatic transmission, and when it fails, it can make your car feel unreliable and unsafe to drive. This replacement T42 TCM, part number 24235753, is the definitive solution to get your car back to factory-spec performance without a costly trip to the dealership.
The Professional’s Choice for a Lasting Repair
Over the years, I’ve learned that the most common cause of TCM failure is internal circuit board breakdown from constant heat cycles and engine vibration. This leads to the erratic behavior you’re experiencing. Our solution is a high-quality replacement module that comes pre-programmed to your vehicle’s specific VIN. This is a critical step that many overlook. Without proper programming, a new module is just a paperweight. We handle the complex part, so you receive a true plug-and-play component. This not only saves you hundreds in dealership programming fees but also ensures that all transmission shift points and torque converter lockup strategies are perfectly calibrated for your 2006-2008 Grand Prix TCM right out of the box.
Case Study: A Tricky Diagnosis
A customer brought in their ’07 Grand Prix with a complaint of intermittent ‘limp mode.’ The car would randomly refuse to shift past 2nd gear, but after shutting it off and restarting, it would work fine for a while. There were no hard codes, just a generic P0700 (Transmission Control System Malfunction). After checking the wiring and solenoids, which all tested fine, we suspected the TCM. The intermittent nature of the problem pointed to a heat-related failure on the module’s circuit board. We installed one of our VIN-programmed TCMs, and the problem was solved instantly. The customer was back on the road in under an hour, avoiding a much larger diagnostic and repair bill at a transmission shop.
Is Your Grand Prix Showing These Telltale Signs?
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ Vehicle is stuck in one gear (often called ‘limp mode’).
- ✔ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, or other solenoid-related DTCs.
- ✔ Inability to upshift or downshift, leading to poor acceleration.
- ✔ A noticeable drop in fuel economy.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Your Grand Prix TCM Swap
For the 2006-2008 Grand Prix TCM, the replacement is surprisingly simple. You don’t need to be a professional mechanic to do this job in your driveway.
- Safety First: Disconnect the negative terminal from your car’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Locate the Module: On the Grand Prix, the TCM is typically found underneath the air cleaner housing. You will need to remove the airbox to access it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Reconnect the electrical connectors, ensuring they click securely into place. Reinstall the air cleaner housing.
- Final Steps: Reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. If you have a basic scan tool, it’s good practice to clear any lingering fault codes.
Verified Fitment for Your Vehicle
This module is a direct replacement for part number 24235753 and other interchangeable numbers. It is specifically programmed for the 2006-2008 Pontiac Grand Prix. While this T42-style module fits a wide range of GM vehicles, this particular listing is configured for your Grand Prix to ensure perfect compatibility.
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. This Transmission Control Module comes fully pre-programmed to your vehicle’s VIN. It is ready for installation right out of the box, saving you time and money.
Where is the TCM located on a 2006-2008 Grand Prix?
The TCM is located in the engine bay, situated underneath the lower air cleaner housing. You will need to remove the airbox assembly to gain access.
What if my part number is slightly different?
This module replaces several service numbers, including 24242391, 24234503, and 24252114. As long as your vehicle is a 2006-2008 Grand Prix, this module is the correct fit, even if your original part number varies slightly.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module without the hassle of returning it.
Will this fix a P0700 code?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, a faulty TCM is the root cause. Replacing the module often resolves the P0700 and any related specific codes (like for shift solenoids).