Is Your 2006-2008 Grand Prix Shifting Erratically?
If you’re dealing with harsh, delayed shifts, a check engine light that won’t go away, or your car being stuck in ‘limp mode,’ you’re not alone. Over my 20+ years in the shop, I’ve seen countless GM vehicles, especially the Pontiac Grand Prix, come in with these exact issues. The culprit is almost always a failing Transmission Control Module (TCM). Itโs the brain of your automatic transmission, and when it starts to fail, it can make your reliable sedan feel unpredictable and unsafe.
Expert Pro Tip: Before plugging in your new TCM, take a moment to inspect and clean the harness connectors. A blast of electronics cleaner and a small brush can remove years of grime and corrosion, ensuring a perfect connection and preventing intermittent signal issues down the road. It’s a two-minute step that can save you hours of headaches.
The Direct Solution: A VIN-Programmed Replacement
Forget expensive diagnostic fees and a trip to the dealership. This T42 Transmission Control Module is the definitive fix for your transmission woes. We pre-program it to your Grand Prix’s specific Vehicle Identification Number (VIN) before it ships. This means it arrives at your door ready for a true plug-and-play installation, loaded with the latest GM software updates to ensure perfect communication with your vehicle’s powertrain. This is the same process a dealer would perform, but without the high labor costs and scheduling delays.
Common Symptoms of a Failing 2006-2008 Grand Prix TCM:
- โ Abrupt, hard shifting or banging into gear.
- โ The vehicle feels stuck in one gear (typically 2nd or 3rd) and won’t shift up or down.
- โ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, or other solenoid-related faults.
- โ Hesitation or delay when shifting from Park to Drive or Reverse.
- โ A noticeable drop in fuel economy due to inefficient shifting.
- โ Complete loss of communication with the transmission.
Simple Installation for Your 2006-2008 Grand Prix TCM
You don’t need to be a master mechanic to perform this repair. For the ’06-’08 Grand Prix, the TCM is conveniently located under the lower air cleaner housing, making it accessible with basic hand tools. The entire process typically takes less than 30 minutes.
- 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.
- Access the Module: Remove the air cleaner box assembly to expose the TCM.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module and unbolt it from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a click as they lock in.
- Final Steps: Reinstall the air cleaner housing and reconnect the battery terminal. Start the vehicle and let it idle for a few minutes to allow the systems to recalibrate.
This module, part number 24235732, is a direct replacement for a wide range of original service numbers, including 24252114, 24234503, 24242391, and more. Built to strict OEM standards and backed by our one-year warranty, it’s the reliable, long-term solution to restore your car’s smooth performance. Order today and get your Grand Prix shifting like new again.