Is your Buick Rainier suffering from harsh, erratic shifting, getting stuck in gear, or displaying a transmission warning light? These are classic signs of a failing Transmission Control Module (TCM), a critical component that acts as the brain for your automatic transmission. Don’t let frustrating transmission problems ruin your driving experience. This professionally programmed T42 TCM is the definitive, hassle-free solution to restore your vehicle’s smooth performance and reliability.
Common Symptoms & Your Solution
A faulty TCM can cause a cascade of issues that make your vehicle feel unpredictable and unsafe. If you’re experiencing any of the following, this module is the fix you need:
- Harsh or delayed gear engagement
- Slipping between gears or sudden, jerky shifts
- Vehicle stuck in “limp mode” (usually 2nd or 3rd gear)
- Check Engine Light or Transmission Warning Light is on
- Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related codes
- Failure to upshift or downshift properly
- Poor fuel economy and potential transmission overheating
This replacement 2006-2007 Buick Rainier transmission control module arrives pre-programmed to your vehicle’s specific VIN, ensuring it works perfectly right out of the box. This eliminates the need for an expensive trip to the dealership for programming, saving you both time and money.
Features & Benefits
- ✔ Plug-and-Play Installation: This module is programmed to your vehicle’s VIN using the latest GM software. It’s ready to install immediately, with no additional programming required.
- ✔ Restore Smooth Shifting: By precisely managing shift solenoids, torque converter lockup, and line pressure, this TCM brings back the smooth, responsive shifting you expect from your Buick.
- ✔ Solve Annoying Warning Lights: A direct solution for clearing persistent transmission-related DTCs and turning off the check engine light caused by a failing original module.
- ✔ OEM-Standard Quality: Built to meet or exceed original equipment specifications for dependable performance and long-lasting durability, ensuring it can handle the demands of daily driving.
- ✔ One-Year Warranty: This unit is backed by our one-year replacement warranty.
Expert Insight: The Power of Proper Programming
Many people don’t realize that a TCM isn’t just a simple electronic part; it’s a computer tailored to your specific vehicle. The VIN programming we perform does more than just make it compatible—it loads the precise shift strategies and operational parameters for your Rainier’s engine and drivetrain combination. This is why generic, non-programmed modules often fail to fix the problem or even introduce new ones. Our process ensures your transmission operates exactly as the manufacturer intended, protecting it from premature wear and restoring optimal performance.
Frequently Asked Questions
How do I provide my VIN for programming?
After you place your order, you will be prompted to provide your vehicle’s 17-digit VIN. We cannot ship the module until we receive this information, as the programming is essential for the part to function correctly in your vehicle.
Is this a difficult part to install?
For most models, including the Buick Rainier, the TCM is located in the engine compartment and is relatively accessible. Installation typically takes less than 30 minutes with basic hand tools. We recommend disconnecting the battery before starting to ensure the vehicle’s computer systems reset properly.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault code, indicating that the TCM has detected a problem. While a failing TCM is a very common cause, this code can also be triggered by other issues. However, if you are experiencing shifting problems along with the code, replacing the 2006-2007 Buick Rainier transmission control module is the most likely solution.
Do I need to return my old TCM?
No, there is no core charge for this part. You can keep your old module, which saves you the time and hassle of packaging and shipping it back.
Is this compatible with other GM vehicles?
Yes, this T42 TCM is compatible with a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E and 4L65E. While this listing is for the 2006-2007 Buick Rainier transmission control module, it also fits models like the Chevrolet Tahoe, GMC Sierra, Cadillac DTS, and many others. Please verify the part number for your specific application.