Is Your Buick Rainier Experiencing Transmission Problems?
If your 2006-2007 Buick Rainier is suffering from harsh shifting, getting stuck in gear, or displaying a check engine light with transmission-related codes, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change and ensuring smooth, efficient operation. When it fails, it can cause a cascade of frustrating and potentially damaging issues. This genuine GM T42 TCM, service part number 24256960, is the definitive solution to restore your vehicle’s transmission performance to factory standards.
From the Diagnostic Bay
We had a 2007 GMC Envoy (which shares the same platform as the Rainier) come into the shop stuck in ‘limp mode’—third gear only. The owner had already replaced two shift solenoids based on a generic code reader’s output, with no success. After connecting our professional scan tool, we saw communication errors with the TCM. A quick inspection revealed no wiring issues, pointing directly to an internal failure of the module. We installed a VIN-programmed T42 TCM, cleared the codes, and the Envoy was shifting perfectly on the test drive. This highlights how replacing the module first can save time and money on unnecessary part swaps.
Common Symptoms of a Failing TCM
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle gets stuck in a single gear (limp mode) to protect the transmission from further damage.
- ✔ Illumination of the Check Engine Light or Transmission Warning Light on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-specific codes are stored.
- ✔ A noticeable decrease in fuel economy due to inefficient shifting patterns.
- ✔ Complete failure to shift, leaving you stranded.
The Premier Solution: A Pre-Programmed 2006-2007 Rainier TCM
Don’t settle for a generic part that requires expensive dealership programming. Our T42 TCMs are meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN) before they ship. This critical step ensures that the module has the latest GM software and is perfectly calibrated for your Rainier’s engine, transmission, and tire size. The result is a true plug-and-play installation that restores optimal performance right out of the box. Simply install the module, connect the battery, and drive away.
Key Features & Benefits
- ✔ VIN Programmed for Your Vehicle: Eliminates the need for costly trips to the dealer. This module arrives ready for immediate installation and operation.
- ✔ Restores Smooth Shifting: Corrects issues like gear slipping, harsh engagement, and incorrect shift points for a like-new driving experience.
- ✔ Clears Persistent Trouble Codes: A new, properly functioning TCM is often the only way to resolve stubborn transmission-related DTCs.
- ✔ OEM-Quality Construction: Built to meet or exceed General Motors’ strict specifications for durability and reliability, ensuring a long service life.
- ✔ No Core Charge: Keep your old part without the hassle or expense of returning a core.
- ✔ Broad Compatibility: While perfect for the 2006-2007 Rainier, this T42 module also interchanges with numerous part numbers (including 24242391, 24234503, 24252114) and fits a wide range of GM vehicles like the Chevrolet Trailblazer, GMC Envoy, and Saab 9-7X.
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load the module with the specific software and calibrations from GM that match your vehicle’s unique VIN. This ensures the TCM communicates correctly with your engine computer and other systems, controlling shift points and torque converter lockup exactly as the manufacturer intended.
Is this a difficult part to install myself?
For most DIY mechanics, this is a straightforward installation. The TCM on a Buick Rainier is typically located in the engine compartment. The process involves disconnecting the battery, unplugging the electrical connectors, unbolting the old module, and installing the new one. The entire job usually takes less than 30 minutes with basic hand tools.
Will this module fix my P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause, it’s essential to have the specific codes read from the TCM itself (e.g., P0751, P0756). If the issue is an internal module failure, this part is the correct fix.
Do I need any special tools for this installation?
No special tools are required. A basic socket set to remove the mounting bolts and a flathead screwdriver to help release the connector clips are typically all that’s needed. We do recommend using a scan tool to clear any old codes from the vehicle’s memory after installation, though the new module will function correctly without this step.
Is there a warranty included with this part?
Yes, this transmission control module comes with a one-year warranty, giving you peace of mind with your purchase.