Is your 2006-2007 Buick Rainier suffering from erratic shifting, getting stuck in gear, or showing a check engine light?
These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change, managing torque converter lockup, and ensuring smooth, efficient operation. When it begins to fail, it can cause a cascade of frustrating and potentially damaging issues, turning your daily drive into a source of constant stress.
This replacement GM T42 Transmission Control Module is the definitive solution to restore your vehicle’s transmission performance. It arrives pre-programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership programming and ensuring a seamless, plug-and-play installation. It’s designed to directly replace OEM part number 24238856 and a wide range of interchangeable service numbers for vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E.
From the Diagnostic Bay
We recently had a 2007 GMC Yukon in the shop with a persistent P0752 code (Shift Solenoid A Stuck On) and a brutally harsh 1-2 shift. The owner had already replaced the solenoid itself twice, with no change in behavior. After confirming the solenoid and internal wiring were good, we traced the fault to the driver circuit within the original TCM. The module was sending an incorrect signal, causing the problem. Installing a correctly programmed T42 module like this one provided an immediate fix, saving the customer from an unnecessary and costly transmission rebuild.
Symptoms of a Failing Buick Rainier TCM
If you’re experiencing any of the following issues, a faulty TCM is the most likely culprit. Don’t let these problems persist, as they can lead to further transmission damage.
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ Vehicle stuck in “limp mode,” often refusing to shift out of 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light illuminated on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) stored, such as P0700 (Transmission Control System Malfunction) or various solenoid-specific codes (P0750, P0751, etc.).
- ✔ Complete failure to upshift or downshift, leading to poor acceleration and high RPMs.
- ✔ A noticeable decrease in fuel economy.
- ✔ Intermittent loss of communication with the TCM, causing erratic behavior.
The Reliable, Programmed Transmission Solution
This isn’t just a replacement part; it’s a complete fix. The most critical feature is our VIN programming service. Before shipping, we load your vehicle’s specific VIN and the latest GM software onto the module. This ensures that it communicates perfectly with your vehicle’s engine computer and other systems right out of the box. This process corrects common software-related issues and guarantees optimal shift points and transmission behavior for your exact vehicle configuration.
Built to meet or exceed OEM specifications, this module is constructed for durability and long-term reliability. The straightforward installation can typically be completed in under 30 minutes with basic hand tools. Depending on your specific GM model, you’ll find the module located in the engine compartment—often near the battery, on a strut tower, or under the air cleaner box. Simply disconnect the battery, swap the modules, reconnect, and you’re ready to go. No core charge means you can keep your old part without any hassle or extra cost.
Frequently Asked Questions
What does “VIN Programmed” actually mean?
It means we flash the module with your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest compatible software from General Motors. This makes the module a true plug-and-play part, as it’s specifically configured for your vehicle’s engine, transmission, and options, eliminating the need for a trip to the dealership for expensive programming.
Can I install this 2006-2007 Buick Rainier TCM myself?
Yes, for many DIY mechanics, this is a straightforward installation. It typically involves disconnecting the battery, locating the old module in the engine bay, unplugging its electrical connectors, unbolting it, and then installing the new one in reverse order. Basic hand tools are usually all that is required.
Will this module fix my P0700 transmission code?
A P0700 code is a general fault code indicating the TCM has detected a problem. Often, the root cause is the TCM itself. Replacing a faulty module with this pre-programmed unit will resolve the P0700 code and any related specific codes (like solenoid faults) if the module was the source of the problem.
Is this a new or used part?
This is an OEM-quality replacement part that has been expertly prepared and programmed to ensure reliability and performance equivalent to or exceeding the original factory module. It is backed by our one-year warranty for your peace of mind.
Do I need to return my old TCM?
No, there is no core charge or requirement to return your old module. This simplifies the process for you, saving you time and the cost of return shipping.