If your 2006-2007 Buick Rainier is suffering from harsh shifts, getting stuck in gear, or throwing transmission codes, you’re likely dealing with a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can make a reliable SUV feel unpredictable and unsafe. This isn’t just an annoyance; it’s a critical component failure that degrades performance and fuel economy. This is the direct, reliable solution you need.
This T42 Transmission Control Module, corresponding to part number 24230461, is the brain of your automatic transmission. It precisely manages shift points, torque converter lockup, and line pressure. We take the guesswork and high dealership costs out of the equation by pre-programming this module to your vehicle’s specific VIN. This ensures it works seamlessly with your Rainier’s systems right out of the box, restoring the smooth, decisive shifting you expect.
A Technician’s Notebook
A customer brought in a 2007 Buick Rainier with a classic complaint: intermittent hard 1-2 shifts and a P0752 (Shift Solenoid ‘A’ Stuck On) code. The previous shop had already replaced the solenoid, but the problem persisted. After a quick data stream analysis, I noticed the TCM was commanding the shift but the hydraulic circuit pressure was lagging. Experience told me this wasn’t a mechanical issue. We installed one of our VIN-programmed T42 TCMs. The shift pressure commands immediately aligned with the sensor readings, and the hard shift was gone. The root cause wasn’t the solenoid itself, but the failing driver circuit inside the original TCM. This is a scenario I’ve diagnosed on hundreds of GM vehicles—replacing the module saved the customer from a costly and unnecessary transmission teardown.
Is Your Rainier Exhibiting These Transmission Problems?
A failing 2006-2007 Rainier TCM will often display clear warning signs. If you’re experiencing any of the following, it’s time to consider a replacement:
- ✔ Harsh, banging, or delayed gear shifts.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ The Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758, or other solenoid-related faults.
- ✔ Inability to upshift or downshift properly.
- ✔ A sudden drop in fuel efficiency.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Installation
Replacing the TCM on your Buick Rainier is a job most DIYers can handle in under 30 minutes with basic tools. The module is located in the engine compartment. No complex relearn procedure is needed thanks to our VIN programming.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the onboard systems.
- Locate the TCM: On the 2006-2007 Rainier, the TCM is typically found in the engine compartment. Check common GM locations like next to the battery, on the LH strut tower, or under the air cleaner box.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly to avoid breaking them. Then, unbolt the module from its mounting bracket.
- Install the New Module: Mount the new, pre-programmed TCM in the same location and secure it with the bolts. Reconnect the electrical connectors, ensuring they click securely into place.
- Final Steps: Reconnect the negative battery terminal. While our programming handles the critical setup, it’s always best practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Vehicle Compatibility
This module is a direct-fit replacement for the 2006-2007 Rainier TCM. It is also compatible with a wide range of other General Motors vehicles equipped with the T42 controller for 4-speed automatic transmissions (like the 4L60E, 4L65E, and 4L70E). It interchanges with multiple part numbers, including 24252114, 24234503, and 24230461, ensuring broad applicability. Some popular compatible models include:
- ✔ Buick Rainier (2006-2007)
- ✔ Chevrolet Trailblazer & GMC Envoy (V8 models)
- ✔ Chevrolet Silverado & GMC Sierra 1500/2500
- ✔ Chevrolet Tahoe/Suburban & GMC Yukon/Yukon XL
- ✔ Hummer H3
- ✔ Saab 9-7X
- …and many other GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
What is VIN programming and why do I need it?
VIN programming loads your vehicle’s specific identification number and factory software settings onto the TCM. This is crucial for ensuring the module communicates correctly with your engine computer, ABS, and other systems. Our service means the part is truly plug-and-play, saving you from a mandatory, expensive programming session at a dealership.
Is this a new or used part?
This is a high-quality, OEM-standard replacement part, inspected and programmed to meet or exceed original factory specifications. It comes with a one-year warranty for your peace of mind.
Do I need any special tools for installation?
No special tools are required. A basic socket set to remove the mounting bolts and a flathead screwdriver to help with connector tabs are typically all you need. The entire process should take less than 30 minutes.
Will this fix my P0700 code?
A P0700 code is a general fault request from the TCM to the main engine computer (ECM) to turn on the check engine light. It indicates a more specific transmission code is stored in the TCM. If the underlying cause is a faulty module, replacing it with our programmed unit will resolve the issue and allow the codes to be cleared permanently.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or dispose of it at your convenience without the hassle of returning it.