Is your 2006-2008 Pontiac Grand Prix suffering from harsh shifting, delayed gear engagement, or getting stuck in limp mode? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every shift with precision. When it fails, it can lead to frustrating and potentially damaging driving experiences. This genuine GM T42 TCM, service number 24240449, is the definitive solution to restore your vehicle’s transmission performance to factory specifications.
From the Diagnostic Bay
We had a 2007 Grand Prix come into the shop with a P0700 code and what the owner described as ‘violent’ shifting from first to second gear. He had already replaced two shift solenoids based on advice from an online forum, with no change. After a quick scan, we saw erratic data from the TCM. The internal circuitry was failing, sending incorrect signals to the solenoids he had just replaced. We installed a VIN-programmed T42 module, cleared the codes, and the car shifted like it just rolled off the assembly line. It’s a powerful reminder that sometimes the issue lies with the controller, not just the components it controls.
Common Symptoms of a Failing Grand Prix TCM
- ✔ Harsh, erratic, or delayed gear shifts that disrupt your driving experience.
- ✔ The vehicle enters “limp mode,” often getting stuck in 2nd or 3rd gear as a protective measure.
- ✔ Your dashboard illuminates with the Check Engine Light or a specific transmission warning light.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700 (Transmission Control System Malfunction), P0750, or other solenoid-related codes are stored.
- ✔ Complete loss of upshifting or downshifting capabilities.
- ✔ A noticeable decrease in fuel economy as the transmission operates inefficiently.
- ✔ Intermittent communication loss with the module, causing unpredictable behavior.
Why Choose Our Programmed 2006-2008 Grand Prix TCM?
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The biggest hurdle in replacing a modern TCM is the need for expensive dealership programming. We eliminate that step entirely. By providing us with your vehicle’s VIN during checkout, we program the module with the latest GM software specific to your Grand Prix. This ensures perfect communication between the engine, transmission, and other vehicle systems right out of the box. No extra tools, no trips to the dealer, and no surprise programming fees.
This T42 TCM is built to meet and exceed original equipment standards, providing a reliable and long-lasting fix. It directly manages shift points, torque converter clutch lockup, and line pressure, restoring the smooth, responsive feel you expect from your car. By replacing your faulty unit with our pre-programmed module, you are not only fixing the immediate symptoms but also preventing potential long-term damage to your transmission’s mechanical components.
Simple, Direct Installation
For the 2006-2008 Pontiac Grand Prix, the TCM is conveniently located under the lower air cleaner housing, making it accessible for a straightforward installation. The entire process can typically be completed in under 30 minutes with basic hand tools. Simply disconnect the battery, remove the air cleaner assembly, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Once installed, reconnect the battery, and you’re ready to go. We recommend clearing any stored DTCs with a standard OBD2 scanner after installation for a clean slate.
This module is a direct replacement for a wide range of part numbers, including 24252114, 24234503, 24230461, 24240449, and more, ensuring broad compatibility for your repair needs.
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. This module comes fully pre-programmed to your vehicle’s specific VIN. You just need to provide your VIN at checkout, and the part will arrive ready for plug-and-play installation, saving you time and money.
Where is the TCM located on my 2007 Grand Prix?
On the 2006-2008 Pontiac Grand Prix, the Transmission Control Module is located in the engine bay, attached to the lower air cleaner housing. Access is typically straightforward after removing the air box.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a failing TCM is a very common cause of this code, it’s essential to diagnose the specific codes stored within the TCM itself (e.g., solenoid codes). This module is designed to resolve issues originating from a faulty TCM, which often trigger a P0700.
Is there a core charge for my old part?
No, there is no core charge required for this part. You can keep your old module without the hassle of returning it, making the replacement process even simpler.
What if I install it and still have issues?
Our modules are rigorously tested and backed by a one-year warranty. If you continue to experience issues after installing a known-good, programmed TCM, the fault may lie with other components in the transmission system, such as wiring, solenoids, or internal mechanical parts. Our expert support team is available to help guide you through further diagnostics.