Restore Peak Transmission Performance in Your Buick Rainier
Is your 2006-2007 Buick Rainier suffering from erratic shifting, getting stuck in gear, or displaying transmission-related warning lights? 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 fails, it can mimic serious mechanical problems, leading to poor performance, decreased fuel economy, and a frustrating driving experience. This VIN-programmed T42 TCM, part number 24234503, is the definitive solution to restore your vehicle’s factory performance and reliability.
From the Diagnostic Bay
We had a 2007 GMC Envoy (which shares the same platform as the Rainier) come into the shop with classic symptoms of a failing transmission—harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode). The owner had already spent a small fortune replacing shift solenoids at another shop, but the problem persisted. After a quick scan, we saw a P0700 code, which is a general transmission fault request. Digging deeper, we found intermittent communication errors with the TCM. Instead of throwing more parts at the transmission itself, we installed a VIN-programmed T42 module. The difference was immediate. All codes cleared, shifts were crisp and smooth, and the customer was back on the road in under an hour, solving a problem that had plagued him for months.
Symptoms of a Failing 2006-2007 Rainier Transmission Control Module
- ✔ Unpredictable or harsh gear shifts that slam into place.
- ✔ The vehicle refuses to shift out of a certain gear, often referred to as “limp mode.”
- ✔ Illumination of the Check Engine Light or other transmission warning indicators on your dash.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-specific codes are stored.
- ✔ A noticeable delay when shifting from Park into Drive or Reverse.
- ✔ Poor acceleration and a significant drop in fuel efficiency.
- ✔ Complete loss of communication with the module, preventing the vehicle from starting or shifting.
The Critical Advantage of VIN Programming
Unlike generic, off-the-shelf modules that require expensive and time-consuming trips to the dealership for programming, this TCM arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We load the latest GM software updates, ensuring that the module communicates flawlessly with your vehicle’s Engine Control Unit (ECU) and other onboard systems right out of the box. This plug-and-play solution eliminates compatibility issues, optimizes shift points and hydraulic pressure for your specific vehicle configuration, and guarantees a seamless installation process. Simply install the module, clear any old codes, and drive away.
Installation and Compatibility
Installation is a straightforward process for a DIY mechanic or any professional technician. The TCM is typically located in the engine compartment—often on the LH side near the strut tower, next to the battery, or under the air cleaner box, depending on your specific GM model. The entire process can usually be completed in under 30 minutes. This module is a direct replacement for a wide range of part numbers, including 24252114, 24234503, 24230461, 24242391, and more, ensuring broad compatibility across dozens of GM vehicles from 2006-2014, such as the Chevrolet Silverado, Tahoe, GMC Sierra, Cadillac DTS, and Pontiac G6.
Built to meet or exceed OEM specifications, this module is backed by our one-year warranty for your peace of mind. There is no core charge, so you don’t have to worry about the cost or hassle of returning your old part. Restore your vehicle’s drivability and reliability today.
Frequently Asked Questions
What does a “VIN-programmed” TCM mean?
It means the module is pre-loaded with the specific software and calibrations for your vehicle’s exact VIN. This ensures it works perfectly with your engine, transmission, and options package right out of the box, eliminating the need for dealership programming.
Is this a difficult part to install myself?
For most individuals with basic mechanical skills, installation is straightforward. It typically involves disconnecting the battery, locating the old module in the engine bay, unplugging its electrical connectors, swapping it with the new one, and reconnecting everything. The entire process often takes less than 30 minutes.
Will this fix my transmission error codes like P0700?
Yes, if the TCM is the root cause of the problem. A P0700 code is a general fault code indicating the TCM has detected an issue. Replacing a faulty TCM often resolves this code and related specific codes (like those for shift solenoids) that it was generating.
Do I need to send my old module back? Is there a core charge?
No, there is absolutely no core charge for this part. You can keep, recycle, or dispose of your old module without any extra fees or hassle.
How do I know if my TCM is failing and not the transmission itself?
TCM failure often presents as erratic, electronic-type problems: sudden harsh shifts, intermittent limp mode, or communication error codes. Mechanical transmission failures are more often associated with consistent slipping, grinding noises, or fluid leaks. If the problems are inconsistent and electrical in nature, the TCM is a primary suspect.