Restore Peak Transmission Performance in Your Chevrolet Avalanche
If your 2007-2008 Chevrolet Avalanche 1500 is suffering from erratic shifting, getting stuck in gear, or throwing transmission-related trouble codes, the culprit is often a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can cause a host of frustrating and potentially damaging issues. This replacement T42 TCM, part number 24234503, is the definitive solution, arriving pre-programmed to your truck’s specific VIN for a seamless, plug-and-play installation that gets you back on the road with confidence.
Over my 20+ years in diagnostics, I’ve seen countless drivers spend a fortune on transmission fluid flushes or solenoid replacements, only to find the root cause was the TCM all along. This module directly controls shift points, torque converter clutch engagement, and line pressure, making it critical for the health and performance of your 4L60E, 4L65E, or 4L70E transmission. By replacing it, you’re not just fixing a symptom; you’re addressing the core problem and preventing further wear on your transmission’s mechanical components.
From the Diagnostic Bay: The Case of the Ghostly Limp Mode
A customer brought in his ’08 Avalanche 1500, complaining of intermittent ‘limp mode’ where the truck would get stuck in 3rd gear. It only happened on hot days after a long drive. He’d already replaced two shift solenoids at another shop with no luck. After connecting my scan tool, I saw a history of intermittent communication loss codes alongside the typical P0700. The transmission itself was mechanically sound. The issue was heat-soak affecting the original TCM’s internal circuits. We installed one of our VIN-programmed modules, and the problem was solved permanently. This is a classic failure pattern for the 2007-2008 Avalanche 1500 TCM, and this part is the reliable fix.
Is Your Avalanche Exhibiting These Telltale Signs?
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”).
- ✔ An illuminated Check Engine Light or Transmission Warning Light with codes like P0700 (Transmission Control System Malfunction) or P0750-series (Shift Solenoid) codes.
- ✔ Failure to upshift or downshift properly, leading to poor acceleration.
- ✔ A noticeable drop in fuel economy or signs of the transmission overheating.
- ✔ Complete loss of communication with the TCM, preventing diagnostics.
A Straightforward Guide to Installation
Installing your new 2007-2008 Avalanche 1500 TCM is a simple job that most DIYers can complete in under 30 minutes with basic hand tools. For the Avalanche, you’ll typically find it located in the engine bay, right next to the battery.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: Find the TCM mounted next to the battery. It’s a silver box with several large electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses. They have locking tabs that need to be released. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new, pre-programmed module in the same location, securely tightening the bolts. Reconnect the electrical harnesses, ensuring 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 scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of General Motors vehicles. While this page is dedicated to the 2007-2008 Avalanche 1500 TCM, it is also compatible with the following models. Please verify your specific application.
Interchangeable Part Numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, and more.
Partial Fitment List:
- Chevrolet Avalanche 1500 (2007-2008)
- Chevrolet Silverado & GMC Sierra 1500/2500 (2007-2013)
- Chevrolet Tahoe & GMC Yukon (2007-2009)
- Chevrolet Suburban 1500 (2007-2008)
- Chevrolet Express & GMC Savana Vans (2006-2014)
- Cadillac DTS (2006-2011)
- Hummer H3 (2008-2010)
- Pontiac G6, Grand Prix (2006-2010)
- And many other GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
Do I need to take my truck to the dealer for programming?
No. We pre-program this module to your vehicle’s VIN before shipping. It arrives ready for installation with no additional programming or dealer visits required.
What is the location of the TCM on a 2007 Avalanche?
On the 2007-2008 Chevrolet Avalanche 1500, the Transmission Control Module (TCM) is conveniently located in the engine compartment, mounted right next to the battery.
Is there a core charge for this part?
No, we do not require a core charge. You can keep your old part, saving you the time and hassle of shipping it back.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, a failing TCM is the root cause, and replacing it with this programmed unit will resolve the P0700 and any related solenoid codes.
What kind of warranty is included?
This module is backed by our one-year warranty, giving you peace of mind and assurance in the quality and reliability of your repair.