Restore Your Buick’s Drivability and Performance
If your 2006-2007 Buick Rainier is suffering from harsh shifting, getting stuck in gear, or has an illuminated check engine light, a failing Transmission Control Module (TCM) is the most likely culprit. As a seasoned technician, I’ve seen countless GM vehicles sidelined by these exact issues. This T42 series TCM, part number 24235754, is the definitive solution, engineered to restore the precise, smooth operation you expect from your vehicle. It arrives expertly programmed to your Rainier’s specific Vehicle Identification Number (VIN), eliminating the need for expensive dealership visits and ensuring a seamless, plug-and-play repair.
Common Signs of a Failing Buick Rainier TCM
A faulty TCM can manifest in ways that are both frustrating and concerning. It’s the brain of your automatic transmission, and when it fails, communication breaks down. Based on my diagnostic experience, here are the tell-tale signs that point directly to a needed replacement. Addressing this promptly can prevent further damage to your transmission’s mechanical components.
- ✔ Unpredictable or jarring gear shifts.
- ✔ The vehicle enters “limp mode,” often stuck in 2nd or 3rd gear.
- ✔ Check Engine Light is on with transmission-related Diagnostic Trouble Codes (DTCs) like P0700 or various solenoid codes (P0750, P0751, etc.).
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable decrease in fuel economy.
- ✔ Complete loss of communication with the module, preventing shifts altogether.
A Technician’s Notebook
I recently had a 2007 Buick Rainier in the shop with a classic T42 TCM failure. The owner reported intermittent, violent shifts and that the vehicle would sometimes refuse to shift out of 2nd gear after warming up. A scan revealed a P0700 (Transmission Control System Malfunction) and an internal processor fault code. Instead of sending the customer to the dealer for a new module and programming, we used one of our pre-programmed units. The entire job took less than 20 minutes from hood-up to test drive. The Rainier shifted perfectly, the codes were gone, and the customer saved hundreds in dealership fees. This is the power of a ready-to-install solution.
DIY-Friendly Installation: Get Back on the Road Fast
Replacing the 2006-2007 Rainier TCM is a straightforward job that most DIY enthusiasts can complete in their own driveway. The module is conveniently located in the engine compartment, making it easily accessible. No specialized tools are required.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s adaptive memory.
- Locate the Module: On the Buick Rainier, the TCM is typically found in the engine compartment. Check common locations like near the air cleaner box or on the LH side of the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly to avoid damaging them. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new, VIN-programmed module in place and securely fasten it. Reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD2 scanner to clear any stored fault codes from the ECU. Start the vehicle and take it for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of General Motors vehicles equipped with the T42 controller. While this listing is for the 2006-2007 Rainier TCM, it is also interchangeable with part numbers 24252114, 24234503, 24230461, and others. Please verify your part number or contact us with your VIN to ensure perfect fitment.
This part will fit these makes and models with these options
ENVOY 08-09 Transmission; (LH engine compartment)
SAVANA 3500 VAN 06-14 Transmission; (RH engine compartment)
VUE 07-08 Transmission; 2.4L, (LH front engine compartment)
G5 07-10 Transmission; (LH strut tower)
SIERRA 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
LUCERNE 06-07 Transmission; (4.6L), (LH engine compartment)
VUE 09 Transmission; 2.4L, w/hybrid, LH side front engine compartment, (shift control)
VUE 10 Transmission
TAHOE 08-09 Transmission; (next to battery), w/o auxiliary oil cooler pump
YUKON XL 1500 07-08 Transmission; (next to battery)
AURA 07-09 Transmission; (LH frame rail front)
RENDEZVOUS 06-07 Transmission; (air cleaner box)
SAAB 9-7X 06-09 Transmission; (LH engine compartment)
SAVANA 2500 VAN 06-14 Transmission; (RH engine compartment)
ALLURE 06-09 Transmission; (lower air cleaner housing)
LUCERNE 08-11 Transmission; (LH engine compartment)
RAINIER 06-07 Transmission
SILVERADO 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
SILVERADO 1500 PICKUP 09-13 Transmission; (next to battery), w/o hybrid option
YUKON 09 Transmission; (next to battery), w/o auxiliary oil cooler pump
ENVOY 06-07 Transmission; (LH engine compartment), (8 cylinder)
MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
YUKON 08 Transmission; (next to battery), w/o auxiliary oil cooler control
EXPRESS 1500 VAN 06-14 Transmission; (RH engine compartment)
SSR 05-06 Transmission; (front LH frame)
SAVANA 1500 VAN 06-14 Transmission; (RH engine compartment)
SIERRA 1500 PICKUP 09-13 Transmission; (next to battery), w/o hybrid option
EXPRESS 3500 VAN 06-14 Transmission; (RH engine compartment)
ION 06-07 Transmission; (behind LH strut tower)
PURSUIT 06 Transmission; (LH strut tower)
TAHOE 07 Transmission; (next to battery)
ENVOY XL 06 Transmission; (LH engine compartment), (8 cylinder)
EXPRESS 2500 VAN 06-14 Transmission; (RH engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
MONTANA 06-09 Transmission; (LH strut tower)
TRAILBLAZER 08-09 Transmission; (LH engine compartment)
YUKON 07 Transmission; (next to battery)
G6 06-10 Transmission; (LH strut tower)
HHR 06-11 Transmission; (LH engine compartment)
TRAILBLAZER 06-07 Transmission; (LH engine compartment), (8 cylinder)
AVALANCHE 1500 07-08 Transmission; (next to battery)
COBALT 06-10 Transmission; (LH strut tower)
SIERRA 1500 PICKUP 08 Transmission; (next to battery)
SILVERADO 1500 PICKUP 08 Transmission; (next to battery)
LACROSSE 06-09 Transmission; (lower air cleaner housing)
SIERRA 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
SILVERADO 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
COLORADO 08-12 Transmission; (RH rear engine compartment)
SUBURBAN 1500 07-08 Transmission; (next to battery)
VUE 09 Transmission; 2.4L, w/o hybrid; (LH front engine compartment)
CANYON 08-12 Transmission; (RH rear engine compartment)
DTS 06-11 Transmission; (RH front engine compartment)
MALIBU 06-10 Transmission; (LH frame rail)
GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
TERRAZA 06-07 Transmission; (LH strut tower)
TRAILBLAZER EXT 06 Transmission; (LH engine compartment), (8 cylinder)
UPLANDER 06-09 Transmission; (LH strut tower)
Frequently Asked Questions
Why is VIN programming so important?
VIN programming loads your vehicle’s exact software and calibrations onto the module. This ensures it communicates perfectly with the engine computer and other systems, controlling shift points, torque converter lockup, and line pressure as the factory intended. It makes the part truly plug-and-play.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep your old module or recycle it locally, saving you the time and hassle of a return shipment.
Will this fix a P0700 trouble code?
Yes, in most cases. The P0700 code is a general fault code indicating the TCM has detected a problem. If the root cause is an internal failure of the TCM itself, replacing it with this pre-programmed unit will resolve the issue and allow the code to be cleared.
Is a warranty included?
Absolutely. This module is backed by our one-year warranty, giving you peace of mind and confidence in your repair.
Can I install this myself if I have basic mechanical skills?
Yes, this is an excellent job for a DIY mechanic. The location is accessible in the engine bay, and the replacement process involves simple hand tools. Our installation guide above provides the key steps to follow.