Restore Peak Performance to Your Buick Rainier’s Transmission
If your 2006-2007 Buick Rainier is suddenly plagued by erratic shifting, getting stuck in gear, or has the check engine light illuminated, the cause is very likely a failing Transmission Control Module (TCM). As an automotive technician with over two decades of experience, I’ve seen countless GM vehicles, including the capable Rainier, sidelined by this exact issue. The TCM is the electronic brain of your automatic transmission, and when it fails, it can mimic the symptoms of a catastrophic mechanical failure, leading to stressful and costly misdiagnoses.
This replacement T42 TCM, part number 24235340, is the definitive solution to get your SUV back to driving smoothly and reliably. The most significant advantage we offer is our expert VIN programming service. Before this module ships, we flash it with your Rainier’s specific Vehicle Identification Number and the latest GM software. This critical step ensures the module communicates perfectly with your vehicle’s other computers right out of the box, eliminating the need for an expensive trip to the dealership for programming. It’s a true plug-and-play fix designed for both professional installers and determined DIYers.
A Technician’s Notebook: The Rainier That Dodged a Rebuild
A customer brought in their ’07 Rainier, convinced the transmission was shot. It was banging into gear and wouldn’t shift past 2nd. The dash was lit up with a check engine light, and they’d been quoted over $3,000 for a transmission rebuild at another shop. My first step was to pull the codes—P0700 (Transmission Control System Malfunction) and a handful of solenoid circuit codes. In my experience, when you see a cluster of electrical transmission codes like that, the problem is rarely mechanical. It’s almost always the module. We installed one of our pre-programmed 2006-2007 Rainier TCM units, cleared the codes, and the vehicle shifted perfectly. The customer saved thousands and was back on the road in under an hour.
Is Your Rainier Showing These Transmission Faults?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. Ignoring these signs can lead to further transmission damage and reduced vehicle safety.
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ The vehicle is stuck in a single gear, often called “limp mode” (typically 2nd or 3rd gear).
- ✔ An illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Complete loss of upshifting or downshifting capabilities.
- ✔ A noticeable decrease in fuel economy.
- ✔ The torque converter failing to lock up at highway speeds.
A Straightforward Guide to Installation
Replacing the 2006-2007 Rainier TCM is a job most people with basic tools can complete in their own driveway. The module is conveniently located in the engine compartment, making access simple. Follow these steps for a successful installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work. This prevents short circuits and helps reset the vehicle’s computer systems.
- Locate the TCM: On the Buick Rainier, the TCM is typically found in the left-hand (driver’s side) of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. Press the release tabs firmly to avoid damaging them. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Reconnect the electrical connectors, ensuring they click securely into position.
- Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD2 scan tool to clear any stored fault codes from the computer’s memory. Start the vehicle and take it for a test drive to confirm that shifting has returned to normal.
Verified Vehicle Compatibility List
This T42 Transmission Control Module is a direct-fit replacement for the original part in the following vehicles. It is interchangeable with numerous part numbers, including 24252114, 24234503, 24230461, and 24234274. Please verify your vehicle is on this list for guaranteed compatibility.
- Buick Rainier: 2006-2007
- Buick Allure: 2006-2009 (Lower air cleaner housing)
- Buick LaCrosse: 2006-2009 (Lower air cleaner housing)
- Buick Lucerne: 2006-2011 (LH engine compartment)
- Buick Rendezvous: 2006-2007 (Air cleaner box)
- Buick Terraza: 2006-2007 (LH strut tower)
- Cadillac DTS: 2006-2011 (RH front engine compartment)
- Chevrolet Avalanche 1500: 2007-2008 (Next to battery)
- Chevrolet Cobalt: 2006-2010 (LH strut tower)
- Chevrolet Colorado: 2008-2012 (RH rear engine compartment)
- Chevrolet Express/Savana Vans: 2006-2014 (RH engine compartment)
- Chevrolet HHR: 2006-2011 (LH engine compartment)
- Chevrolet Impala: 2006-2011 (Lower air cleaner housing)
- Chevrolet Malibu: 2006-2010 (LH frame rail)
- Chevrolet Monte Carlo: 2006-2007 (Lower air cleaner housing)
- Chevrolet Silverado/Sierra 1500/2500: 2007-2013 (Next to battery)
- Chevrolet SSR: 2005-2006 (Front LH frame)
- Chevrolet Suburban 1500: 2007-2008 (Next to battery)
- Chevrolet Tahoe: 2007-2009 (Next to battery)
- Chevrolet Trailblazer / GMC Envoy: 2006-2009 (8-cylinder, LH engine compartment)
- GMC Canyon: 2008-2012 (RH rear engine compartment)
- GMC Yukon / Yukon XL 1500: 2007-2009 (Next to battery)
- Hummer H3: 2008-2010 (RH rear engine compartment)
- Pontiac G5/G6/Grand Prix: 2006-2010 (LH strut tower)
- Saturn Aura/Ion/Vue: 2006-2010 (Location varies by model)
- Saab 9-7X: 2006-2009 (LH engine compartment)
Don’t let a faulty TCM keep your reliable Buick Rainier off the road. This pre-programmed 2006-2007 Rainier TCM is the most effective and efficient way to restore your vehicle’s transmission performance. Order yours today and experience the difference of a quality, ready-to-install part.
Do I need to send my old TCM back (core charge)?
No, there is absolutely no core charge for this part. You can keep your old module or dispose of it at your convenience, making the process hassle-free.
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique 17-digit VIN into the module before shipping. This ensures it’s a perfect electronic match for your specific vehicle, preventing compatibility errors and allowing for immediate installation without needing a dealership’s expensive programming tools.
Is this part covered by a warranty?
Yes, this transmission control module comes with a one-year warranty, giving you peace of mind and confidence in your purchase.
Will this fix a P0700 check engine light code?
In many cases, yes. The P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is the source of the electrical fault, replacing it with our programmed unit will resolve the issue and allow the code to be cleared.
How difficult is the installation for a beginner?
This is considered a beginner-to-intermediate level repair. If you are comfortable disconnecting a car battery and using basic hand tools like a socket wrench, you can likely complete this installation in under 30-45 minutes.