Is Your 2007-2008 Avalanche Shifting Erratically?
If your Chevrolet Avalanche is experiencing harsh shifting, getting stuck in gear, or displaying a check engine light with transmission codes, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating smooth gear changes, managing torque converter lockup, and monitoring overall transmission health. When it fails, it can mimic the symptoms of a catastrophic mechanical failure, leading to drivability issues and diagnostic headaches.
This genuine GM T42 Transmission Control Module, service number 24240400, is the definitive solution for restoring your truck’s performance. Specifically designed for a wide range of GM vehicles, including the 2007-2008 Avalanche 1500, this module arrives pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures seamless communication with your truck’s other computers, providing a true plug-and-play repair that eliminates the need for expensive dealership programming.
From the Diagnostic Bay
We had a 2007 Silverado (which shares the same platform as the Avalanche) towed in, stuck in what the owner called ‘limp mode’—it wouldn’t shift out of 3rd gear. The dash was lit up with a check engine light. A quick scan revealed code P0700 (Transmission Control System Malfunction) and a specific code for a shift solenoid circuit fault. The owner feared a complete transmission rebuild was in his future. However, experience told us to check the TCM first. We installed a VIN-programmed T42 module just like this one, cleared the codes, and took it for a test drive. The truck shifted perfectly through all gears. What could have been a multi-thousand dollar repair bill was resolved in under an hour with the correct, pre-programmed part.
The Importance of a Programmed 2007-2008 Avalanche TCM
Modern vehicles rely on a network of computers to operate correctly. The TCM must be precisely matched to your Avalanche’s specific configuration, including engine size, axle ratio, and tire size. Our VIN programming service loads the latest GM-certified software onto the module before it ships. This guarantees that it functions exactly as the factory intended, restoring original shift patterns, improving fuel efficiency, and resolving persistent diagnostic trouble codes (DTCs). By replacing your faulty unit with our programmed 2007-2008 Avalanche TCM, you are not just fixing a part; you are restoring the entire transmission system’s integrity.
Common Symptoms of a Failing TCM
- ✔ Harsh, delayed, or erratic gear shifts.
- ✔ Vehicle gets stuck in a single gear (limp mode).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic codes such as P0700, P0750, or other solenoid-related faults.
- ✔ Inability to upshift or downshift properly.
- ✔ A noticeable decrease in fuel economy.
- ✔ The transmission may feel like it’s slipping between gears.
- ✔ Complete loss of communication with the scan tool.
Simple Installation, Lasting Results
Installation is a straightforward process that can be completed by a competent DIY mechanic with basic hand tools. On the 2007-2008 Avalanche, the TCM is typically located in the engine bay, next to the battery. Simply disconnect the vehicle’s battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect everything, and you’re ready to go. Because this module is pre-programmed, there are no extra steps required. Plus, we don’t require a core charge, so you can keep your old part without the hassle of shipping it back.
This module is a direct replacement for a variety of service numbers, including: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, and more. Trust in a quality part that restores your vehicle’s reliability and driving enjoyment. Don’t let a faulty TCM keep your Avalanche off the road—get the right part, programmed and ready to install.
Frequently Asked Questions
What does ‘VIN Programmed’ mean for my TCM?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM software onto the module before shipping. This ensures it communicates perfectly with your truck’s engine computer and other systems right out of the box, eliminating the need for a costly trip to the dealership for programming.
Will this part fix a P0700 trouble code?
A P0700 code is a general fault indicator, meaning the TCM has detected a problem within the transmission system. While this module often resolves the root cause of the P0700, especially when accompanied by other specific solenoid or communication codes, you should ensure other potential issues (like wiring or sensors) have been ruled out.
Is this a difficult part to install myself?
For most individuals with basic mechanical skills, this is a very manageable job. On the 2007-2008 Avalanche, the TCM is easily accessible in the engine compartment next to the battery. The process involves disconnecting the battery, unplugging a few connectors, and removing mounting bolts. No special tools are required.
Do I need to send my old TCM back?
No, there is no core charge for this part. You can keep, recycle, or dispose of your old module at your convenience without any additional fees or hassle.
How can I be sure this is the correct part for my truck?
This module is a guaranteed fit for the 2007-2008 Chevrolet Avalanche 1500. You can also verify by matching the part number 24240400 or any of the listed interchangeable service numbers on your existing module.