Restore Crisp, Reliable Shifting to Your Pontiac Grand Prix
If your 2006, 2007, or 2008 Pontiac Grand Prix is suffering from erratic shifting, getting stuck in gear, or throwing transmission-related check engine lights, a failing Transmission Control Module (TCM) is the most common culprit. As a technician with over two decades of experience under the hood, I’ve seen firsthand how a faulty TCM can make a great car feel unpredictable and unsafe. This T42 Transmission Control Module, part number 24243901, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
The TCM is the electronic brain of your automatic transmission. It processes data from various sensors to control shift solenoids, manage torque converter lockup, and regulate line pressure. When it fails, communication breaks down, leading to the frustrating symptoms you’re likely experiencing. Our module restores this critical communication, ensuring your transmission operates exactly as the manufacturer intended, without the exorbitant cost and hassle of a dealership visit for programming.
From the Diagnostic Bay: The Intermittent Shifting Mystery
A customer brought in his ’07 Grand Prix with a complaint that stumped two other shops: intermittent, bone-jarring shifts from 1st to 2nd, but only after the car was fully warmed up. There were no consistent trouble codes, just a generic P0700 (Transmission Control System Malfunction) that would pop up occasionally. After checking the fluid and solenoids, which were fine, I focused on the TCM. On these GM platforms, heat soak can cause micro-fractures in the TCM’s circuit board, leading to these exact temperature-sensitive issues. We installed one of our pre-programmed T42 modules, and the problem vanished instantly. It’s a classic failure I’ve diagnosed hundreds of times, and a new module is the only reliable fix.
Is Your Grand Prix Showing These Telltale Signs?
A failing TCM doesn’t just degrade your driving experience; it can cause premature wear on your transmission’s mechanical parts. If you notice any of the following, it’s time to act:
- âś” Harsh, slamming, or delayed gear shifts.
- âś” The vehicle feels stuck in one gear (often called “limp mode”).
- âś” Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, or other solenoid-specific faults.
- âś” Inability to upshift or downshift properly.
- âś” A noticeable drop in fuel economy.
- âś” Complete loss of communication with the transmission.
A Straightforward Guide to Installation
One of the best features of this module is its simple installation. For the 2006-2008 Grand Prix, the process is straightforward enough for a confident DIYer with basic hand tools. You can have your car back to normal in under 30 minutes.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the TCM: On your Grand Prix, the TCM is typically found bolted to the lower air cleaner housing in the engine bay. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. While our programming handles the critical setup, it’s always good practice to use a basic OBD2 scanner to clear any stored fault codes.
Verified Fitment For Your Vehicle
This T42 TCM is a direct-fit replacement for your 2006-2008 Grand Prix TCM and is also compatible with a wide range of other GM vehicles. It interchanges with part numbers including 24252114, 24234503, 24230461, 24243901, and more. This module is confirmed to fit the following models (note location variance):
- 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)
- And many other GM cars, trucks, and SUVs from 2006-2014. Please verify your part number or contact us for fitment confirmation.
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 directly onto the module before we ship it. 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 ratchet are all you need to access and replace the module on a Grand Prix. The most important part is providing us with your VIN at checkout.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause (like an internal TCM failure), it’s crucial to ensure the issue isn’t with external wiring or a solenoid. In my experience, if you have other symptoms like erratic shifting, the TCM is the most likely culprit.
Is there a core charge? Do I need to send my old part back?
No, there is no core charge. You can keep your old part, which saves you the time and hassle of packaging and shipping it back.
What is the warranty on this part?
This transmission control module is backed by our one-year, hassle-free warranty, giving you peace of mind and confidence in your repair.