Restore Your Avalanche’s Smooth Ride
If your 2007-2008 Chevrolet Avalanche 1500 is suffering from harsh, erratic shifting, getting stuck in gear, or has the dreaded check engine light on with transmission codes, you’re not alone. As a technician with over two decades of experience, I’ve seen countless GM trucks exhibit these exact symptoms. The cause is often a failing Transmission Control Module (TCM). This critical component is the brain of your automatic transmission, and when it falters, it can make your reliable truck feel unpredictable and unsafe. Don’t let a faulty module sideline your vehicle or lead to a costly misdiagnosis.
This OEM-quality T42 TCM, part number 24235753, is the definitive solution. We take the guesswork and expense out of the repair by pre-programming it to your truck’s specific Vehicle Identification Number (VIN). This means it arrives ready for a true plug-and-play installation, with no need for an expensive trip to the dealership for programming. It’s designed to restore the precise, smooth shifting and reliable performance you expect from your Avalanche.
From the Diagnostic Bay: The Case of the Limp-Mode Avalanche
A customer brought in his ’08 Avalanche, frustrated. It was stuck in what he called “crawler gear”—what we know as limp mode (stuck in 3rd gear). His local shop had already replaced two shift solenoids based on a P0750-series code, but the problem returned within days. I hooked up my professional scan tool and saw the code, but I also noticed erratic data from the TCM. It was intermittently losing communication. After 20 years in the business, I know that on these GM trucks, intermittent electrical gremlins in the TCM are a classic failure point. We installed a VIN-programmed module, and the problem was solved permanently. The issue wasn’t the solenoids; it was the computer controlling them. This part prevents that kind of diagnostic runaround.
Is Your Avalanche Exhibiting These Telltale TCM Failure Signs?
- ✔ Abrupt, harsh, or banging shifts between gears.
- ✔ The vehicle is stuck in a single gear (limp mode) and won’t shift up or down.
- ✔ Check Engine Light or Transmission Warning Light is illuminated with Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, etc.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable drop in fuel economy due to inefficient shifting.
- ✔ Inconsistent performance that seems to come and go with temperature changes.
Get Your Avalanche Shifting Smoothly: A 30-Minute Install Guide
Replacing the 2007-2008 Avalanche TCM is a straightforward job that most DIYers can handle in their own driveway. For this specific vehicle, the module is conveniently located right next to the battery in the engine compartment, making access easy.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the TCM: Open the hood and find the TCM mounted to a bracket right next to the battery. It’s a silver box with several large electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that need to be released. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place. Securely plug in the wiring harness connectors, ensuring they click and lock into position.
- Final Steps: Reconnect the negative battery terminal. While the battery disconnect clears most faults, it’s best practice to use a basic OBD2 scan tool to clear any lingering DTCs from the system’s memory. Start the vehicle and enjoy a smooth ride!
Verified Vehicle Compatibility List
This T42 TCM is a direct-fit replacement for a wide range of General Motors vehicles. While this page is focused on the 2007-2008 Avalanche TCM, this part is also compatible with the following models. Please verify your specific part number for a guaranteed match.
- Chevrolet: Avalanche 1500 (07-08), Silverado 1500/2500 (07-13), Tahoe (07-09), Suburban 1500 (07-08), Express/Savana Vans (06-14), Cobalt (06-10), HHR (06-11), Impala (06-11), Monte Carlo (06-07), Malibu (06-10), Colorado (08-12)
- GMC: Sierra 1500/2500 (07-13), Yukon / Yukon XL 1500 (07-08), Envoy (06-09), Canyon (08-12)
- Buick: LaCrosse (06-09), Lucerne (06-11), Rainier (06-07), Rendezvous (06-07)
- Pontiac: G5 (07-10), G6 (06-10), Grand Prix (06-08), Pursuit (06)
- Cadillac: DTS (06-11)
- Saturn: Vue (07-10), Aura (07-09), Ion (06-07)
- Hummer: H3 (08-10)
- Saab: 9-7X (06-09)
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. This is the biggest benefit of our service. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for installation, saving you the time, hassle, and expense of a dealership visit.
Where is the TCM located on my 2007 Avalanche?
On the 2007-2008 Chevrolet Avalanche 1500, the Transmission Control Module (TCM) is conveniently located in the engine bay, mounted on a bracket right next to the battery.
Will this fix a P0700 trouble code?
A P0700 code is a generic fault request from the TCM to the main engine computer (ECM) to turn on the check engine light. While this module often resolves the underlying issue causing the P0700, it’s important to scan for other P07xx codes to confirm the specific transmission fault. A failing TCM is a very common cause.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or recycle it locally without the need to ship it back to us, making the repair process simpler and faster.