Restore Smooth, Reliable Shifting to Your Buick Rainier
If you’re experiencing the frustration of a transmission that won’t shift correctly, gets stuck in gear, or illuminates your check engine light, you’re not alone. The Transmission Control Module (TCM) is the brain of your automatic transmission, and when it fails, it can cause a host of alarming issues. This replacement T42 TCM, part number 24235340, is the definitive solution for your 2006-2007 Buick Rainier, arriving expertly programmed to your vehicle’s VIN for a true plug-and-play fix.
As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline an otherwise perfectly good vehicle. This module directly manages shift solenoids, torque converter clutch engagement, and line pressure, ensuring your transmission operates exactly as the manufacturer intended. By replacing your failing unit with this quality-tested module, you’re not just fixing a symptom—you’re restoring the core logic of your drivetrain for long-term reliability and performance.
Case Study: A Tricky Diagnosis
A customer brought in their ’07 Rainier complaining of intermittent, violent 1-2 shifts and occasionally getting stuck in ‘limp mode’ (3rd gear only). Their local shop quoted them for a full transmission rebuild. I hooked up my scanner and found a P0752 (Shift Solenoid A Stuck On) and the tell-tale P0700 (Transmission Control System Malfunction). Instead of a costly mechanical failure, my experience pointed to the TCM itself. The internal drivers that control the solenoids often fail from heat and vibration. We installed one of these pre-programmed T42 modules, cleared the codes, and the vehicle shifted like new. It saved the customer thousands and got them back on the road in under an hour.
Is Your Buick Rainier Exhibiting These Transmission Faults?
A failing TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ Vehicle is stuck in one gear (often called ‘limp mode’).
- ✔ Check Engine Light is on with transmission-related Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0752, or other solenoid-specific codes.
- ✔ Failure to upshift or downshift, leading to poor acceleration.
- ✔ Decreased fuel economy and potential transmission overheating.
- ✔ Complete loss of communication with the TCM, preventing diagnostics.
A Straightforward Guide to Installation
One of the best features of this part is its simple installation, which a DIYer can typically complete in under 30 minutes with basic hand tools. No need for an expensive trip to the dealership.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: On the 2006-2007 Buick Rainier, the TCM is typically found in the engine compartment. Check common GM locations like next to the battery, on the LH side of the engine compartment, or under the air cleaner box.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a small screwdriver to gently release the locking tabs if necessary. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new VIN-programmed TCM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes from the system’s memory. Start the vehicle and test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for part number 24235340 and is interchangeable with many other GM service numbers. It is guaranteed to fit the following models:
- Buick Rainier: 2006-2007
- Buick Allure / LaCrosse: 2006-2009 (lower air cleaner housing)
- Buick Lucerne: 2006-2011 (LH engine compartment)
- Buick Rendezvous: 2006-2007 (air cleaner box)
- Cadillac DTS: 2006-2011 (RH front engine compartment)
- Chevrolet Avalanche 1500: 2007-2008 (next to battery)
- Chevrolet Cobalt / Pontiac G5 / Pursuit: 2006-2010 (LH strut tower)
- Chevrolet Colorado / GMC Canyon: 2008-2012 (RH rear engine compartment)
- Chevrolet Express / GMC Savana Vans: 2006-2014 (RH engine compartment)
- Chevrolet HHR: 2006-2011 (LH engine compartment)
- Chevrolet Impala / Monte Carlo: 2006-2011 (lower air cleaner housing)
- Chevrolet Malibu: 2006-2010 (LH frame rail)
- Chevrolet Silverado / GMC Sierra 1500/2500: 2007-2013 (next to battery)
- Chevrolet SSR: 2005-2006 (front LH frame)
- Chevrolet Suburban / GMC Yukon XL: 2007-2008 (next to battery)
- Chevrolet Tahoe / GMC Yukon: 2007-2009 (next to battery)
- Chevrolet Trailblazer / GMC Envoy: 2006-2009 (LH engine compartment)
- GMC Envoy XL / Trailblazer EXT: 2006 (8 cylinder, LH engine compartment)
- Hummer H3: 2008-2010 (RH rear engine compartment)
- Pontiac G6: 2006-2010 (LH strut tower)
- Pontiac Grand Prix: 2006-2008 (lower air cleaner housing)
- Saturn Aura: 2007-2009 (LH frame rail front)
- Saturn Ion: 2006-2007 (behind LH strut tower)
- Saturn Vue: 2007-2010 (LH front engine compartment)
- Saab 9-7X: 2006-2009 (LH engine compartment)
What does ‘VIN Programmed’ mean for me?
What does ‘VIN Programmed’ mean for me?
It means the module arrives ready for installation with no extra steps. We flash it with your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software. This ensures it communicates perfectly with your engine computer and other systems, eliminating the need for expensive dealership programming.
Will this part fix a P0700 trouble code?
Yes, in most cases. The P0700 code is a general fault code indicating the TCM has detected a problem. A faulty TCM is a very common cause of this code. By replacing the module, you are often fixing the root cause that triggers P0700 and other related transmission codes.
Is this a difficult part to replace for a DIYer?
Not at all. This is considered one of the easier electronic component replacements. With basic hand tools and our instructions, most people can swap the module in less than 30 minutes. The most important part is ensuring the battery is disconnected before you begin.
Is there a core charge or do I need to send my old part back?
No, there is no core charge. You can keep your old part or dispose of it, making the process simpler and hassle-free for you.