Restore Peak Performance to Your Buick Rainier’s Transmission
If you’re dealing with the frustrating and often unpredictable symptoms of a failing transmission control module in your 2006-2007 Buick Rainier, you’ve come to the right place. As a technician with over two decades of experience under the hood, I’ve seen how a faulty TCM can make even the most reliable GM vehicle feel unsafe and unpredictable. Harsh bangs into gear, getting stuck in limp mode, or a persistent check engine light can ruin your driving experience. This T42 Transmission Control Module, part number 24255280, is the definitive, reliable solution designed to restore the smooth, precise shifting your vehicle had when it was new.
The real advantage here is our pre-programming service. We flash this module with your vehicle’s specific VIN and the latest GM software before it even leaves our facility. This means you can skip the expensive trip to the dealership for programming. For the DIY mechanic, this is a game-changer, turning a potentially complex job into a simple plug-and-play replacement. For the professional, it means faster turnaround times and a happier customer. This isn’t just a part; it’s a complete solution for your 2006-2007 Rainier TCM problems.
A Technician’s Notebook: The Intermittent Shifting Mystery
A few months back, a 2007 Buick Rainier was towed into the shop. The owner was fed up. He explained that some days it drove perfectly, but on others, it would refuse to shift out of 2nd gear and the transmission temp light would flicker. He’d already replaced a shift solenoid on another mechanic’s advice, with no improvement. After hooking up my scan tool, I saw a generic P0700 code and a history of intermittent communication loss with the TCM. Instead of throwing more parts at it, we tested the module’s power and ground circuits, which were solid. The culprit was clear: internal failure within the TCM itself. We installed one of our pre-programmed T42 modules, and the problem was solved instantly. The test drive was smooth, and the customer drove away with a permanent fix, saving hundreds on further misdiagnosis.
Is Your Buick Showing These Transmission Warning Signs?
- ✔ Abrupt, harsh, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle enters “limp mode,” often getting stuck in a single gear (usually 2nd or 3rd).
- ✔ Your check engine light or transmission warning light is illuminated, often with DTCs like P0700 (TCM Fault), P0750-P0758 (Solenoid Circuit Faults), or U0101 (Lost Communication with TCM).
- ✔ A noticeable drop in fuel economy as the transmission fails to shift efficiently.
- ✔ The transmission seems to slip out of gear or struggles to engage when shifting from Park to Drive or Reverse.
- ✔ Complete failure to upshift or downshift, leaving you with limited power and speed.
DIY-Friendly Installation: 30 Minutes to Smooth Shifting
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work. This prevents short circuits and helps reset the vehicle’s adaptive memory.
- ✔ Locate the Module: On the 2006-2007 Buick Rainier, the TCM is typically found in the engine compartment. Check for a silver box with electrical connectors.
- ✔ Disconnect and Remove: Carefully unplug the electrical harness connectors. Press the release tabs firmly to avoid damaging them. Then, unbolt the module from its mounting bracket.
- ✔ Install the New Module: Mount your new, pre-programmed TCM in the same location and securely fasten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- ✔ Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. While not always necessary, using a basic OBD2 scanner to clear any stored diagnostic trouble codes is a good final step.
Verified Fitment for Your General Motors Vehicle
While this is a direct-fit solution for the 2006-2007 Rainier TCM, this versatile T42 module is also compatible with a wide array of other GM vehicles. It is interchangeable with part numbers 24242391, 24234503, 24252114, and others. Please verify your specific model and year from the list below or contact our expert support team to confirm compatibility.
Do I need to take my vehicle to the dealership after installation?
Do I need to take my vehicle to the dealership after installation?
No. This Transmission Control Module comes fully pre-programmed to your vehicle’s VIN. It’s a true plug-and-play solution, saving you the time and expense of a dealer visit for programming.
Will this part fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases where the TCM itself has failed internally, replacing it with this module will resolve the code and the underlying issue. However, proper diagnosis is always recommended, as P0700 can also be triggered by other transmission hardware failures.
What tools are required for installation?
Installation typically requires only basic hand tools, such as a socket set and ratchet to remove the mounting bolts and a wrench for the battery terminal. No specialized equipment is needed.
Is there a core charge for my old part?
No, there is no core charge required. You can keep your old module or dispose of it without the hassle of returning it.
What kind of warranty is included?
This module is backed by our comprehensive one-year warranty, giving you peace of mind and confidence in your repair.