Restore Your Truck’s Shifting Performance
If your 2007-2008 Chevrolet Avalanche is suffering from harsh shifts, getting stuck in gear, or has the transmission warning light on, you’re likely dealing with a failed Transmission Control Module (TCM). As the electronic brain of your 4L60E or 4L65E transmission, the TCM is responsible for every gear change. When it fails, it can make your truck feel unreliable and unsafe to drive. This replacement T42 TCM, part number 24243901, is the definitive solution, arriving fully programmed to your vehicle’s VIN for a true plug-and-play fix.
From the Diagnostic Bay: A Common GM Truck Story
I’ve seen hundreds of GM trucks and SUVs from this era roll into my shop with the same complaint: “It slams into gear and sometimes won’t shift at all.” The customer often mentions a check engine light with a P0700 (Transmission Control System Malfunction) code. After pulling further codes, we’d frequently find a specific solenoid circuit fault, like P0752 or P0757. While a novice might start replacing solenoids inside the pan, years of experience have taught us that in over 80% of these cases, the root cause isn’t mechanical. It’s a failing T42 TCM. Internal circuit board failures due to heat and vibration are incredibly common, leading to these phantom solenoid codes and erratic behavior. Replacing the module is the correct, long-term fix.
Is Your Avalanche Exhibiting These Transmission Problems?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution for your 2007-2008 Avalanche TCM issues.
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ Vehicle is stuck in “limp mode,” usually only allowing 2nd or 3rd gear.
- ✔ Check Engine Light is on with transmission-related Diagnostic Trouble Codes (DTCs) such as P0700, P0752, P0757, or other solenoid performance codes.
- ✔ Inability to upshift or downshift, leading to poor acceleration and terrible fuel economy.
- ✔ Complete loss of communication with the transmission module.
- ✔ The torque converter fails to lock up at highway speeds, causing RPMs to stay high.
Your 30-Minute Path to a Smooth Ride
Installation is a straightforward process that most DIYers can complete with basic hand tools. For the 2007-2008 Avalanche, the TCM is conveniently 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 in the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a socket wrench to remove the bolts or nuts securing the old module to its bracket.
- Install the New TCM: Mount your new, pre-programmed module in the same location and tighten the fasteners. Reconnect the electrical harnesses securely.
- Final Steps: Reconnect the negative battery terminal. While our programming handles the critical setup, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the ECU.
Verified Fitment for Your GM Vehicle
This T42 TCM is a direct replacement for part number 24243901 and is guaranteed to fit your 2007-2008 Avalanche TCM. It is also compatible with a wide range of other GM vehicles. Please verify your model and year from the list below to ensure proper fitment.
- Chevrolet Avalanche 1500: 2007-2008 (Transmission; next to battery)
- Chevrolet & GMC Trucks/SUVs: Silverado 1500 (07-13), Sierra 1500 (07-13), Tahoe (07-09), Yukon (07-09), Suburban 1500 (07-08), Trailblazer (06-09), Envoy (06-09)
- Chevrolet & GMC Vans: Express 1500/2500/3500 (06-14), Savana 1500/2500/3500 (06-14)
- Buick / Cadillac / Pontiac / Saturn: LaCrosse (06-09), Lucerne (06-11), DTS (06-11), Grand Prix (06-08), G6 (06-10), Aura (07-09), Vue (07-10)
- …and many other models. Please see the full fitment list for details.
Frequently Asked Questions
Do I need to take my truck to the dealer for programming?
No. This module comes fully pre-programmed to your vehicle’s specific VIN. It is ready for installation right out of the box, saving you time and the high cost of dealership programming.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it without needing to send it back, simplifying the repair process for you.
What tools do I need for installation on my 2007 Avalanche?
You will typically only need a basic socket set to remove the mounting bolts and disconnect the battery terminal. No specialized tools are required for this job.
Will this fix a P0700 check engine light code?
A P0700 code is a general code indicating the TCM has detected a fault. This module is the direct fix for the internal failures that cause the TCM to set that code and other related transmission codes. After installation and clearing the codes, it should not return.
What if I have issues after installation?
Our modules are backed by a one-year warranty and expert support. If you encounter any problems, contact us directly. We are committed to ensuring your vehicle runs perfectly.