Restore Smooth Shifting to Your 2006-2007 Buick Rainier
If your 2006-2007 Buick Rainier is suffering from harsh shifts, getting stuck in gear, or throwing transmission codes, the problem is often not the transmission itself, but its electronic brain. As a technician with over two decades of experience, I’ve seen countless GM vehicles with these symptoms. The culprit is almost always a failing Transmission Control Module (TCM). This T42 series TCM, part number 24234274, is the definitive, reliable fix for your SUV’s shifting problems, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play solution.
This isn’t just a replacement part; it’s a restoration of your vehicle’s drivability. The TCM is responsible for every gear change, managing hydraulic pressure and torque converter lockup. When it fails, communication breaks down, leading to the erratic behavior you’re experiencing. Our module is loaded with the latest GM software updates, ensuring it communicates flawlessly with your engine computer and other vehicle systems, eliminating the need for an expensive trip to the dealership for programming.
Case Study: The Rainier That Dodged a Rebuild
A customer brought in their ’07 Rainier a few months back. The symptoms were severe: it would slam into gear from a stop and refuse to shift past 2nd gear on the highway. Another shop had quoted them over $3,000 for a transmission rebuild. I hooked up my scan tool and saw the classic P0700 code, a general transmission fault. Digging deeper, I found intermittent solenoid circuit codes. Instead of tearing down the transmission, I checked the TCM. After seeing no physical damage, I knew from experience that the internal logic was failing. We installed one of our VIN-programmed T42 modules. In less than 30 minutes, the Rainier was shifting like it just left the showroom. The customer saved thousands and avoided an unnecessary, major repair.
Is Your Buick Rainier Showing These Telltale Signs?
A failing 2006-2007 Rainier TCM can manifest in several ways. If you’re experiencing any of the following, this module is your likely solution:
- ✔ Harsh, banging, or erratic gear shifts.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, especially P0700, P0750-series solenoid codes, or communication errors.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ Poor fuel economy and a feeling of sluggish performance.
- ✔ Complete failure to shift gears.
A Straightforward Guide to Installation
You don’t need to be a professional mechanic to install this part. The process is simple and can be completed with basic hand tools in your own garage.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Old TCM: On the Buick Rainier, the TCM is typically found in the engine compartment. Check near the air cleaner box or on the driver’s side of the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new VIN-programmed TCM into place and securely reconnect the electrical harnesses. You’ll hear a click when they are properly seated.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. While the module is plug-and-play, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes from the previous failure.
Verified Fitment For Your Vehicle
This T42 Transmission Control Module is the correct replacement for your 2006-2007 Rainier TCM. While this page is dedicated to the Rainier, this part also fits a wide range of other GM vehicles, ensuring broad compatibility and proven performance. It is a direct replacement for part numbers 24234274, 24252114, 24234503, and others listed in the interchange data.
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. We program the module to your vehicle’s VIN before shipping. It arrives ready for installation with no additional programming required, saving you time and money.
What is a “core charge” and do you require one?
A core charge is a deposit you pay until you return your old part. We do not have a core charge on this module, so you can keep or dispose of your old part without any hassle.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main engine computer to turn on the check engine light. In many cases where the TCM itself is the root cause of the transmission problem, replacing it with our module will resolve the issue and allow the code to be cleared.
How difficult is the installation?
Installation is very straightforward for most DIYers. It involves locating the module in the engine bay, disconnecting the battery, swapping the part with basic hand tools, and reconnecting the battery. It typically takes less than 30 minutes.
What kind of warranty is included?
This module is backed by our one-year, hassle-free warranty, giving you peace of mind with your purchase.