Restore Flawless Shifting to Your Pontiac Grand Prix
Is your 2006-2008 Pontiac Grand Prix suffering from erratic shifting, getting stuck in gear, or throwing transmission-related check engine light codes? You’re not alone. The Transmission Control Module (TCM), the electronic brain of your automatic transmission, is a common failure point. This replacement T42 TCM, part number 24255280, is the definitive solution to restore your vehicle’s performance and reliability. As the command center for your transmission, it manages shift points, torque converter clutch engagement, and line pressure, ensuring every gear change is smooth and precise.
What sets our modules apart is our expert VIN programming service. Before we ship your part, we flash it with the latest GM software updates specific to your vehicle’s VIN. This means it arrives ready for a true plug-and-play installation, eliminating the need for an expensive and time-consuming trip to the dealership for programming. This is the most efficient way to get your Grand Prix back on the road and shifting like it just left the factory.
A Technician’s Notebook
I remember a 2007 Grand Prix that came into the shop with a classic T42 TCM failure. The customer complained of harsh 1-2 shifts and an intermittent P0752 code (Shift Solenoid ‘A’ Stuck On). He had already replaced the solenoid twice, but the problem persisted. After a quick data stream analysis, I saw the TCM was commanding the solenoid erratically. The internal drivers in these modules can weaken over time from heat and vibration, causing them to send faulty signals. We installed one of our VIN-programmed TCMs, and the problem was solved instantly. It’s a textbook example of how a failing module can mimic a mechanical fault, making proper diagnosis key.
Is Your Grand Prix Showing These Telltale Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. Don’t let a small electronic part lead to a major transmission issue.
- âś” Harsh, delayed, or unpredictable gear shifts.
- âś” The vehicle enters “limp mode,” often stuck in 2nd or 3rd gear.
- âś” Check Engine Light or Transmission Warning Light is illuminated.
- âś” Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0752, or other solenoid-related faults.
- âś” A complete failure to shift up or down.
- âś” Noticeable decrease in fuel economy due to inefficient shifting.
- âś” Intermittent loss of communication with the TCM, visible on a scan tool.
A Straightforward Guide to Installation
For the 2006-2008 Pontiac Grand Prix, this job is well within the reach of a DIY enthusiast. You can have your car back to normal in under an hour with basic hand tools.
- 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 underneath the air cleaner housing. You will need to remove the airbox to gain access.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. 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 harnesses, ensuring they click securely into position.
- Reassemble and Reconnect: Reinstall the air cleaner housing and any other components you removed. Reconnect the negative battery terminal.
- Final Steps: Start the vehicle. While our programming handles the critical setup, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes from the ECU. Your vehicle is now ready to drive.
Solving Problems with a Reliable 2006-2008 Grand Prix TCM
This module is not just a replacement part; it’s a long-term fix for your transmission woes. Built to meet or exceed original equipment specifications and backed by a one-year warranty, it provides the durability needed for daily driving. By ensuring precise electronic control over your transmission, you not only get smoother performance but also protect the transmission’s mechanical components from the stress caused by a faulty module. This part is interchangeable with a wide range of GM service numbers, including 24252114, 24234503, 24230461, and 24255280.
Verified Vehicle Compatibility
While this listing is for the Pontiac Grand Prix, this T42 TCM is compatible with a wide array of General Motors vehicles. Please verify the location and part number for your specific model.
- Pontiac Grand Prix: 2006-2008 (Transmission; lower air cleaner housing)
- Buick Allure / LaCrosse: 2006-2009 (Transmission; lower air cleaner housing)
- Chevrolet Impala / Monte Carlo: 2006-2011 (Transmission; lower air cleaner housing)
- Chevrolet Cobalt / Pontiac G5 / Saturn Ion: 2006-2010 (Transmission; LH strut tower)
- And many other GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
What does a VIN-programmed TCM mean for me?
It means the module arrives ready to install right out of the box. We load your vehicle’s specific information onto the module before shipping, so it communicates perfectly with your car’s other computers without requiring a trip to a mechanic or dealer for expensive programming.
Will this fix my P0700 transmission code?
A P0700 is a generic code indicating the TCM has detected a fault. Often, the fault is with the TCM itself. If your diagnosis points to a bad module, this part is the correct solution to clear P0700 and the specific codes it has stored.
Where is the TCM located on my 2007 Grand Prix?
On the 2006-2008 Pontiac Grand Prix, you will find the Transmission Control Module located directly under the engine’s air cleaner box assembly. You’ll need to remove the airbox to access it.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep your old module or dispose of it, making the replacement process simple and hassle-free.
Is any special software or tool needed after installation?
No special software is required. Because the unit is pre-programmed, the installation is plug-and-play. We do recommend using a standard OBD2 scan tool to clear any old codes after the battery is reconnected.
What if this doesn’t fix my problem?
This module is backed by our one-year warranty. If you’ve correctly diagnosed the TCM as the issue, this part will resolve it. If you have any issues, our expert support team is here to help you troubleshoot.