If you’re dealing with the frustration of a 2006-2007 Buick Rainier that shifts harshly, gets stuck in gear, or throws transmission-related trouble codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless GM vehicles sidelined by a faulty Transmission Control Module (TCM). The T42 TCM is the electronic brain of your automatic transmission, and when it fails, it can cause a cascade of baffling and expensive-feeling problems. This isn’t just an inconvenience; it’s a critical failure that affects your vehicle’s drivability and safety.
We offer a reliable and straightforward solution: a high-quality replacement T42 TCM, part number 24235753, that arrives at your door pre-programmed to your vehicle’s specific VIN. This crucial step eliminates the need for a costly trip to the dealership for programming. You get a part that’s ready for immediate installation, designed to restore the precise, smooth shifting and performance you expect from your Rainier. Stop guessing with intermittent electrical gremlins and get the definitive fix.
Case Study: A Tricky Diagnosis
I remember a 2007 Rainier that came into the shop with a classic complaint: “It drives fine for 20 minutes, then it starts slamming into gear.” The owner had already replaced a shift solenoid with no luck. We scanned it and found an intermittent P0751 code. Instead of just throwing more parts at it, we monitored the TCM data stream on a long test drive. Sure enough, as the engine bay heated up, the command signals from the TCM started dropping out. Heat soak was causing internal failure in the module. A new, pre-programmed TCM fixed it on the first try, saving the customer from a potential transmission rebuild.
Is Your Rainier Showing These Telltale Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, your module is the likely culprit. In my experience, these symptoms are often misdiagnosed as internal transmission failure, so checking the TCM first can save you thousands.
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ Vehicle is stuck in “limp mode,” usually only allowing 2nd or 3rd gear.
- ✔ The Check Engine Light or a dedicated transmission warning light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, especially a generic P0700 (Transmission Control System Malfunction) or specific solenoid codes (e.g., P0751, P0756).
- ✔ Complete loss of upshifting or downshifting capabilities.
- ✔ A noticeable drop in fuel economy as the transmission operates inefficiently.
Plug-and-Play Installation: Get Back on the Road Fast
One of the biggest advantages of our module is the simple, DIY-friendly installation. Because we program it to your VIN, you don’t need any specialized dealer tools. For the 2006-2007 Buick Rainier, the process is very accessible.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On the Rainier, the TCM is typically found in the engine compartment. Check for a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harness connectors. Be gentle with the locking tabs. Then, unbolt the old TCM from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed module into place and securely reconnect the wiring harnesses. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. While the system often resets on its own, it’s best practice to use a basic OBD2 scanner to clear any stored fault codes. Start the vehicle and enjoy your smooth-shifting transmission!
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct fit for the 2006-2007 Buick Rainier. It also serves as a replacement for a wide range of other General Motors vehicles that use the same T42 platform with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with numerous part numbers, including 24242391, 24234503, and 24252114. Always verify the part number on your original module to ensure a perfect match.
Frequently Asked Questions
What does ‘VIN Programmed’ mean for me?
It means we load your vehicle’s specific identification number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your vehicle’s engine computer and other systems right out of the box, eliminating the need for expensive dealer programming.
Do I need to send my old part back?
No, there is no core charge for this module. You can keep your old part or recycle it locally, saving you the hassle and cost of return shipping.
Is this a difficult part for a DIYer to install?
Not at all. For most models, including the Rainier, it’s a simple bolt-on, plug-in part located in the engine bay. With basic hand tools, the job can typically be completed in under 30 minutes.
What kind of warranty is included?
This module is backed by our one-year, hassle-free warranty. We stand by the quality and reliability of our programmed electronics, giving you peace of mind with your purchase.