Restore Peak Transmission Performance in Your Buick Rainier
Are you experiencing frustrating and unpredictable shifting in your 2006-2007 Buick Rainier? Issues like harsh gear changes, getting stuck in limp mode, or seeing a persistent check engine light can point directly to a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every shift with precision. When it fails, the smooth, reliable performance you expect from your vehicle disappears. This replacement GM T42 Transmission Control Module, part number 24240449, is the definitive solution to restore your vehicle’s drivability and peace of mind.
From the Diagnostic Bay
We recently had a 2007 GMC Envoy (which shares the same platform as the Rainier) come into the shop with classic symptoms of a bad transmission—erratic shifting and a P0752 code for a stuck shift solenoid. The owner had already spent hundreds replacing the solenoid pack, but the problem persisted. After a quick diagnostic, we identified the real culprit: the T42 TCM was sending faulty signals. Instead of another costly internal transmission repair, we installed a VIN-programmed TCM. The vehicle was shifting perfectly within an hour, saving the customer time, money, and a lot of headaches. It’s a powerful reminder that the controller is often the source of the problem, not just the mechanical parts.
Is Your Buick Showing Signs of a Failing TCM?
A faulty transmission module can manifest in various ways, often mimicking mechanical transmission failure. Before considering a costly transmission rebuild, check if your vehicle is exhibiting these common symptoms. Replacing the TCM is often a simpler, more affordable fix.
- ✔ Erratic and Harsh Shifting: Experiencing sudden, jerky gear changes, or a noticeable delay when the transmission shifts.
- ✔ Stuck in Gear: The vehicle may enter a “limp mode,” often getting stuck in 2nd or 3rd gear to prevent further damage.
- ✔ Warning Lights: The Check Engine Light or a specific transmission warning light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes associated with TCM failure include P0700 (Transmission Control System Malfunction) and various solenoid-specific codes (P0750, P0751, etc.).
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lockup can lead to a noticeable decrease in your vehicle’s MPG.
- ✔ Complete Failure to Shift: In severe cases, the transmission may not shift up or down at all, making the vehicle difficult to drive.
The Ultimate Convenience: VIN-Programmed for Plug-and-Play Installation
The biggest challenge with replacing modern electronic modules is the need for expensive dealership programming. We eliminate that step entirely. This T42 TCM arrives at your door pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN). This ensures that the module is loaded with the latest GM software updates and is perfectly calibrated for your Rainier’s engine, transmission, and tire size. The result is a true plug-and-play installation that restores factory performance without any additional setup. Simply install the module, clear any old codes, and drive away.
Why Choose Our 2006-2007 Rainier TCM?
This isn’t just a replacement part; it’s a comprehensive repair solution. Built to strict OEM standards, our 2006-2007 Rainier TCM provides the reliability and longevity you need. It directly controls critical functions like shift timing, line pressure, and torque converter clutch engagement, ensuring every component works in harmony. This module is a direct replacement for a wide range of part numbers, including 24252114, 24234503, 24240449, and more, making it a versatile solution for numerous GM vehicles from 2006-2014. Backed by a one-year warranty, you can be confident in its quality and performance.
Broad Compatibility Across the GM Lineup
While this is the perfect module for your Buick Rainier, the T42 TCM was used in a vast number of GM cars, trucks, and SUVs. It is compatible with vehicles equipped with popular 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. This includes models such as the Chevrolet Silverado, Tahoe, Impala, and Cobalt; GMC Sierra and Yukon; Cadillac DTS; Pontiac G6; and many others. Always verify the fitment for your specific vehicle before ordering.
Frequently Asked Questions
Do I need to get this TCM programmed by a dealer?
No. This module comes pre-programmed to your vehicle’s VIN. It is ready for installation right out of the box, saving you a trip to the dealership and additional programming fees.
Where is the TCM located on a 2006-2007 Buick Rainier?
On the Buick Rainier and similar GMT360 platform vehicles (like the Trailblazer and Envoy), the Transmission Control Module is typically located in the engine compartment on the driver’s side (LH side).
Will this part fix a P0700 diagnostic trouble code?
A P0700 code is a general code indicating that the TCM has detected a fault and has requested the check engine light be turned on. While this module can resolve the underlying issue causing the P0700, it’s essential to scan for other transmission-specific codes (like P07xx) to confirm the exact problem. A failing TCM is a very common cause.
Is installation difficult for a DIY mechanic?
Installation is generally straightforward for someone with basic mechanical skills. It involves disconnecting the battery, locating the old module, unplugging the electrical connectors, unbolting it, and installing the new one. The entire process typically takes less than 30 minutes.
Is there a core charge for this module?
No, there is no core charge required for this part. You can keep your old module without the hassle of returning it.