Restore Smooth, Reliable Shifting to Your Buick Rendezvous
If you’re dealing with the frustrating and often unpredictable behavior of a failing transmission, you’ve come to the right place. As a technician with over two decades of experience under the hood, I’ve seen firsthand how a faulty Transmission Control Module (TCM) can turn a reliable vehicle into a source of daily stress. For 2006-2007 Buick Rendezvous owners, symptoms like harsh gear changes, getting stuck in limp mode, or an illuminated Check Engine Light are classic signs that the TCM, the transmission’s brain, is failing. This isn’t just an annoyance; it affects your vehicle’s performance, fuel economy, and safety.
This T42 Transmission Control Module, a direct replacement for part number 24238856, is the definitive solution. The most significant benefit we offer is that each module is meticulously programmed to your vehicle’s specific VIN before it ships. This means you can skip the expensive and time-consuming trip to the dealership for programming. It arrives at your door ready for a true plug-and-play installation, restoring the precise, factory-spec shifting your Rendezvous was designed to have.
Case Study: The Misleading Solenoid Code
A customer brought in a 2007 Rendezvous with a classic complaint: intermittent harsh shifting between 1st and 2nd gear and a P0752 code, indicating a ‘Shift Solenoid A Stuck On’ condition. The owner had already replaced the solenoid himself, but the problem persisted. This is a scenario I’ve seen dozens of times. While the code points to a solenoid, the root cause is often the TCM’s driver circuit for that solenoid failing. The TCM can no longer properly command the solenoid, leading to the code and the symptom. We installed a VIN-programmed TCM, cleared the codes, and the vehicle’s shifting performance was immediately restored. This saved the customer from a costly and unnecessary internal transmission repair.
Is Your Buick Rendezvous Showing These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission failure. Catching the signs early can prevent further damage. Look out for these common indicators:
- ✔ Abrupt, harsh, or jerky gear shifts.
- ✔ The vehicle feels like it’s stuck in one gear (often 2nd or 3rd), a condition known as “limp mode.”
- ✔ Check Engine Light or Transmission Warning Light is on, with Diagnostic Trouble Codes (DTCs) like P0700 (Transmission Control System Malfunction) or various solenoid-specific codes (P0750-P0774).
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable drop in fuel efficiency.
- ✔ The transmission seems to slip out of gear or struggles to find the right gear.
DIY Fix: Installing Your 2006-2007 Rendezvous TCM
One of the best parts about this solution is its simplicity. You don’t need a professional lift or specialized tools to get the job done. For the Buick Rendezvous, the TCM is conveniently located for easy access.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic component replacement.
- Locate the Module: On your 2006-2007 Rendezvous, the TCM is situated inside the air cleaner box in the engine compartment. You will need to remove the air cleaner assembly lid and filter to access it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Press the release tabs firmly to avoid damaging the clips. Once disconnected, unbolt the module from its mounting bracket.
- Install the New TCM: Mount your new, pre-programmed TCM in place of the old one and securely fasten it. Reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reassemble the air cleaner box. Reconnect the negative battery terminal. While the battery disconnect often clears codes, it’s best practice to use a basic OBD-II scan tool to confirm all transmission-related DTCs are cleared. Start the vehicle and take it for a test drive to confirm smooth shifting.
Verified Fitment for Your Vehicle
This module is engineered for a precise fit and function in the specified models. While it is a guaranteed match for the 2006-2007 Buick Rendezvous, it is also compatible with a wide array of other General Motors vehicles that use the T42 TCM. This part interchanges with numerous service numbers, including 24242391, 24234503, 24252114, and 24238856, ensuring broad applicability and reliability across the GM family.
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. The main benefit of our service is that we program the module to your vehicle’s VIN before shipping. It arrives ready for installation, with no additional programming required.
Is this a difficult part to install myself?
For most DIYers with basic tools, this is a straightforward job. On the Rendezvous, it’s located in the air cleaner box and can typically be swapped in under 30 minutes.
What if my part number is slightly different?
This T42 TCM replaces many GM service numbers. As long as your vehicle is listed in our fitment guide, this module will work, even if the number on your old part differs. Part number 24238856 is one of many compatible numbers.
Does this part come with a warranty?
Yes, it comes with a one-year warranty, giving you peace of mind and confidence in your repair.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or dispose of it without the hassle of sending it back.