Restore Peak Transmission Performance in Your 2007-2008 Chevrolet Avalanche
Is your 2007 or 2008 Chevrolet Avalanche 1500 experiencing frustrating transmission problems like harsh shifting, getting stuck in gear, or an illuminated check engine light? These are classic signs of a failing Transmission Control Module (TCM). 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 cripple your truck’s performance and reliability. This genuine GM T42 Transmission Control Module, service part number 24252114, is the definitive solution, pre-programmed to your vehicle’s specific VIN for a seamless, plug-and-play installation.
From the Diagnostic Bay
We had a 2008 Avalanche 1500 come into the shop that the owner described as ‘possessed.’ It would shift perfectly for a few miles, then suddenly slam into gear or refuse to shift out of second. The dash was lit up with a check engine light and a transmission warning. A quick scan showed a P0700 (Transmission Control System Malfunction) and several solenoid circuit codes. Instead of chasing down individual solenoids, our experience pointed directly to the T42 TCM. After confirming power and ground to the module were good, we installed one of our VIN-programmed units. The installation, located right next to the battery, took less than 20 minutes. After clearing the codes, the truck drove like it just left the factory. The pre-programming saved the customer a trip to the dealer and hundreds in diagnostic and programming fees.
Key Symptoms of a Failing Avalanche 1500 TCM
A faulty TCM can manifest in various ways, often becoming more severe over time. If you notice any of the following issues, it’s time to inspect your module. Replacing a failing TCM promptly can prevent further damage to your transmission’s mechanical components.
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable and unpredictable.
- ✔ The vehicle enters “limp mode,” often getting stuck in 2nd or 3rd gear to protect the transmission.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on the dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other transmission-related solenoid codes are stored.
- ✔ Inability to upshift or downshift, leading to poor acceleration and high RPMs.
- ✔ A noticeable decrease in fuel economy as the transmission operates inefficiently.
- ✔ Intermittent or complete loss of communication with the TCM when checked with a scan tool.
The VIN-Programmed Advantage
This isn’t just a generic, off-the-shelf part. We program each module to your truck’s unique Vehicle Identification Number (VIN) before it ships. This critical step ensures that the TCM has the correct software and calibrations for your Avalanche’s specific configuration, including its engine, axle ratio, and tire size. This process eliminates the need for expensive and time-consuming dealership programming. You receive a part that is ready for immediate installation, restoring factory performance and resolving common software-related DTCs right out of the box.
Installation and Compatibility
Installation is straightforward for the DIY mechanic or professional technician. On the 2007-2008 Avalanche 1500, the TCM is conveniently located in the engine bay, typically right next to the battery. Simply disconnect the 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. We also require no core charge, so you don’t have to worry about the cost or hassle of sending your old part back.
This T42 TCM is a direct replacement for a wide range of GM vehicles and interchanges with numerous part numbers, including: 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24252114, 24256960, and more. It is designed for vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E.
Frequently Asked Questions
What does the T42 TCM do in my 2007-2008 Avalanche?
The Transmission Control Module (TCM) acts as the central computer for your automatic transmission. It receives data from various sensors (like vehicle speed and engine load) to control shift points, line pressure, and torque converter lockup, ensuring smooth and efficient operation.
Is this module truly plug-and-play?
Yes. Because we pre-program the module to your vehicle’s specific VIN, it arrives ready for installation without any need for additional programming or trips to a dealership. Just install it, clear any old codes with a scan tool, and drive.
Where is the TCM located on a 2007-2008 Avalanche 1500?
On this specific model, the TCM is typically found in the engine compartment, mounted right next to the battery. This makes it easily accessible for a quick replacement, usually taking under 30 minutes.
Will this part fix transmission codes like P0700 or P0750?
Yes, in most cases. Codes like P0700 indicate a general transmission fault, while codes like P0750 point to specific solenoid circuit issues. A failing TCM is a very common cause of these codes, and replacing it with a properly programmed unit will resolve the issue.
Do I need to send my old module back?
No. We do not require a core charge for this part. You can keep or dispose of your old module without any additional cost or hassle, simplifying the repair process for you.