Fix Your 2006-2007 Buick Rainier’s Transmission Problems for Good
If you’re dealing with the frustration of a Buick Rainier that shifts harshly, gets stuck in gear, or throws transmission-related check engine lights, you’ve come to the right place. As a technician with over two decades of experience under the hood, I’ve seen countless GM vehicles sidelined by a faulty Transmission Control Module (TCM). This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded. This T42 TCM, part number 24239926, is the definitive, hassle-free solution to restore your vehicle’s performance and your peace of mind.
The TCM is the brain of your automatic transmission, responsible for every shift, torque converter lockup, and line pressure adjustment. When it fails, the symptoms can be dramatic and concerning. This replacement module is meticulously prepared and comes pre-programmed to your Rainier’s specific Vehicle Identification Number (VIN). This critical step ensures it communicates flawlessly with your vehicle’s other computers right out of the box, eliminating the need for an expensive and time-consuming trip to the dealership for programming.
Why Choose a Pre-Programmed Module?
In my shop, the biggest headache for customers replacing electronic modules is the post-installation programming. A non-programmed module is just a metal box. Our process handles this for you. By programming this 2006-2007 Rainier Transmission Control Module with the latest GM software updates before it ships, we ensure it corrects common factory software bugs and optimizes shift strategy for longevity and fuel efficiency. It’s a true plug-and-play repair that saves you time and hundreds of dollars in dealer fees.
A Technician’s Notebook: The P0753 Code That Wasn’t a Solenoid
A customer brought in a 2007 Trailblazer (which uses the same T42 TCM as the Rainier) with a P0753 code for Shift Solenoid ‘A’ Electrical. He had already replaced the solenoid inside the transmission pan twice, but the code kept returning instantly. After a quick check of the wiring harness, I suspected the TCM itself. The driver circuit inside the original module had failed, meaning it could no longer send the correct signal to the new solenoid. We installed one of our pre-programmed T42 modules, cleared the codes, and the problem was solved permanently. This is a classic example of how a faulty TCM can mimic a mechanical failure, costing you time and money on unnecessary parts.
Is Your Buick Rainier Showing These Telltale Signs?
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in ‘limp mode’ (usually 2nd or 3rd gear) with limited power.
- ✔ Your check engine light is on with Diagnostic Trouble Codes (DTCs) like P0700 (Transmission Control System Malfunction), P0750, P0753, or other solenoid-related codes.
- ✔ A complete loss of shifting ability or intermittent communication failure.
- ✔ Poor fuel economy directly linked to incorrect gear selection.
DIY-Friendly Installation in Under 30 Minutes
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- ✔ Locate the TCM: On the 2006-2007 Buick Rainier, the Transmission Control Module 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. Then, unbolt the module from its mounting bracket.
- ✔ Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock in.
- ✔ Final Steps: Reconnect the battery terminal. Start the vehicle and use a basic OBD2 scan tool to clear any stored fault codes from the memory. Your repair is complete.
Verified Fitment for Your Vehicle
While this is the direct solution for your 2006-2007 Rainier Transmission Control Module, this T42 unit is also compatible with a wide range of other General Motors vehicles. It is a direct replacement for part numbers 24252114, 24234503, 24230461, 24239926, and more. Please verify your specific model in the list below or contact our expert team for confirmation.
- Buick Rainier (2006-2007)
- Chevrolet Trailblazer (8-cylinder) (2006-2009)
- GMC Envoy (8-cylinder) (2006-2009)
- Saab 9-7X (2006-2009)
- Chevrolet Silverado & GMC Sierra (various models, 2007-2013)
- Chevrolet Tahoe & GMC Yukon (various models, 2007-2009)
- Cadillac DTS (2006-2011)
- And many more GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. This is the biggest benefit of our service. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for immediate installation, saving you the time, cost, and hassle of a dealership visit.
Where is the TCM located on my 2006 Buick Rainier?
On the 2006-2007 Buick Rainier, the Transmission Control Module is located in the engine compartment. It’s a silver, finned module with large electrical connectors, making it relatively easy to access for replacement.
What is your warranty policy?
We stand behind our parts with a comprehensive one-year warranty. This covers any defects in the module, giving you confidence and peace of mind in your repair.
Is there a core charge for my old part?
No, there is no core charge required. You can keep your old part or recycle it locally without the need to ship anything back to us, simplifying the entire process.