Restore Flawless Shifting to Your Buick Rainier
If your 2006-2007 Buick Rainier is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, you’re not just dealing with an annoyance—you’re facing a common failure point. As a technician with over two decades of experience, I’ve seen countless GM vehicles sidelined by a faulty Transmission Control Module (TCM). This isn’t just a part; it’s the brain of your automatic transmission, and when it fails, it can make your reliable SUV feel unpredictable and unsafe. This replacement T42 TCM, part number 24235732, is the definitive solution, arriving pre-programmed to your vehicle’s VIN for a true plug-and-play repair.
Case Study: A Tricky Diagnosis
A customer brought in a 2007 GMC Envoy (which uses the same T42 system as your Rainier) with a classic complaint: erratic shifting and a check engine light. The codes pointed to multiple shift solenoid failures (P0753, P0758). The owner had already spent hundreds replacing the solenoids inside the transmission pan, but the problem persisted. After a quick check of the wiring, my experience pointed straight to the TCM. The internal drivers that control those solenoids had failed—a very common issue. We installed a VIN-programmed TCM, cleared the codes, and the truck was shifting perfectly in under 30 minutes. This part saved the customer from more unnecessary and expensive transmission work.
Is Your Rainier Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution for your 2006-2007 Rainier Transmission Control Module issues:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ Vehicle is stuck in “limp mode” (usually second or third gear).
- ✔ Check Engine Light is on with transmission-related Diagnostic Trouble Codes (DTCs) like P0700, P0751, P0756, or other solenoid circuit codes.
- ✔ Inconsistent or no shifting, leading to poor acceleration and bad fuel economy.
- ✔ The transmission seems to hunt for gears or slips unexpectedly.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Installation
One of the best features of this part is its simple installation. You don’t need a trip to the dealership for expensive programming. For the 2006-2007 Buick Rainier, the TCM is typically located in the engine compartment. The entire process should take less than half an hour.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the system.
- Locate the Module: On the Rainier and similar platforms (like the Trailblazer/Envoy), find the TCM in the left-hand (driver’s side) of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. 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 and securely reconnect the electrical harnesses. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. Start the vehicle and use a standard OBD2 scan tool to clear any stored fault codes. Take the vehicle for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for part number 24235732 and is interchangeable with service numbers 24242391, 24234503, 24252114, and others. While this page is focused on the 2006-2007 Rainier Transmission Control Module, it also fits a wide array of GM vehicles. Please verify your model and location below:
This part will fit these makes and models with these options:
RAINIER 06-07 Transmission
ENVOY 06-09 Transmission; (LH engine compartment)
TRAILBLAZER 06-09 Transmission; (LH engine compartment), (8 cylinder for 06-07)
SAAB 9-7X 06-09 Transmission; (LH engine compartment)
SILVERADO, SIERRA, TAHOE, YUKON, AVALANCHE, SUBURBAN 07-13 Transmission; (next to battery)
EXPRESS, SAVANA VANS 06-14 Transmission; (RH engine compartment)
IMPALA, MONTE CARLO, LACROSSE, ALLURE, GRAND PRIX 06-11 Transmission; (lower air cleaner housing)
COBALT, G5, G6, PURSUIT, ION 06-10 Transmission; (LH strut tower)
…and many more GM models. Please refer to the full fitment list in the provided data or contact us to confirm for your specific vehicle.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before shipping. It arrives ready for installation, saving you time and the high cost of dealership programming.
Is there a core charge for my old part?
There is no core charge. You can keep your old module without the hassle of returning it.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request from the TCM to the main computer. While this module often resolves the underlying issue causing the P0700 (like a failed solenoid driver), you should always diagnose any other specific codes that are present.
What is the warranty on this part?
This transmission control module comes with a one-year warranty, giving you peace of mind and confidence in your repair.