Is Your 2007-2008 Avalanche Shifting Erratically?
If your Chevrolet Avalanche is experiencing harsh shifting, delayed gear engagement, or has a check engine light illuminated with transmission-related 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 every gear change and ensuring smooth, efficient operation. When it fails, it can lead to a host of drivability issues, from poor fuel economy to being stuck in ‘limp mode,’ making your powerful truck feel unpredictable and unreliable.
From the Diagnostic Bay
We recently had a 2008 Avalanche 1500 come into the shop. The owner was frustrated with it getting stuck in 3rd gear and having a persistent P0700 code. After confirming power and ground to the module, we knew the internal logic had failed. Instead of a costly trip to the dealership for a new module and programming fees, we installed one of our VIN-programmed T42 TCMs. The installation took less than 30 minutes, right next to the battery. After clearing the codes, the truck was shifting perfectly on the test drive, just like it did from the factory. The customer was back on the road the same day, saving significant time and money.
The Plug-and-Play Solution: A Programmed 2007-2008 Avalanche TCM
This genuine GM T42 Transmission Control Module is the definitive solution for your vehicle’s transmission woes. We take the hassle out of the repair by pre-programming the module to your truck’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures that the TCM communicates flawlessly with your engine computer and other vehicle systems right out of the box. You can avoid expensive dealership programming and complex setup procedures. Simply install the module, connect the harnesses, and restore the crisp, reliable shifting performance your Avalanche was built for.
Common Symptoms of a Failing TCM
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ Vehicle is stuck in one gear (limp mode), often 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-specific codes are present.
- ✔ Inability to upshift or downshift properly.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ The transmission may feel like it’s slipping between gears.
- ✔ Complete loss of transmission function in severe cases.
Guaranteed Compatibility and Reliability
This module is a direct replacement for service number 24239224 and is interchangeable with a wide range of other GM part numbers, including 24252114, 24234503, and 24256960. It is engineered to meet or exceed original equipment standards, providing a durable and long-lasting repair for your 4-speed automatic transmission (4L60E, 4L65E, 4L70E). Backed by our one-year warranty, you can drive with confidence knowing your transmission is managed by a quality-tested component. Installation is straightforward for a DIY mechanic or any professional technician, typically located in the engine bay for easy access.
Frequently Asked Questions
Why is VIN programming necessary for this 2007-2008 Avalanche TCM?
VIN programming loads your vehicle’s specific software and calibration files onto the module. This ensures it communicates correctly with the Engine Control Module (ECM) and other systems, controlling shift points, torque converter lockup, and line pressure precisely as the manufacturer intended. Without it, the transmission will not function correctly.
Is this part difficult to install?
No, the installation is relatively simple. On the 2007-2008 Avalanche, the TCM is typically located next to the battery in the engine compartment. The process involves disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and then installing the new one in its place. The entire job can usually be completed in under 30 minutes.
Will this module fix my P0700 check engine light code?
A P0700 code is a general transmission fault code, indicating that the TCM has detected a problem and requested the check engine light to be turned on. Often, a faulty TCM is the root cause. Replacing the module with this pre-programmed unit will resolve the issue if the module itself is the problem. After installation, you should clear all codes with a scan tool.
What if the part number on my old module is different?
GM often uses multiple part numbers for the same component over its production life. This T42 module is a direct interchange for many service numbers, including 24252114, 24234503, 24239926, and others listed in the description. As long as your vehicle is listed as compatible, this module will work perfectly.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep your old module without any additional fees or hassle, making the replacement process even simpler.