If your 2007-2008 Chevrolet Suburban 1500 is suffering from erratic shifting, getting stuck in gear, or has illuminated the check engine light with transmission codes, 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 mimic the symptoms of a catastrophic transmission failure, causing significant stress and diagnostic headaches. Over my 20 years in the shop, I’ve seen countless vehicle owners worry about a multi-thousand dollar transmission rebuild when the real culprit was this module.
This T42-style TCM, part number 24255280, is the definitive solution. We take the guesswork and high dealership costs out of the equation. Before this module ships, we program it directly to your Suburban’s Vehicle Identification Number (VIN). This ensures it communicates perfectly with your vehicle’s Powertrain Control Module (PCM) and other systems right out of the box. No expensive scan tools, no appointments for programming—just a straightforward replacement that restores the crisp, reliable shifting you depend on for family trips and daily driving.
A Technician’s Notebook: The Suburban That Wouldn’t Shift
A customer brought in their ’08 Suburban 1500 with a classic complaint: it was stuck in 3rd gear (limp mode) and the transmission temperature warning was on. They were convinced the transmission was toast. I pulled the codes and saw a P0700 (Transmission Control System Malfunction) and a P0752 (Shift Solenoid ‘A’ Stuck On). While the solenoid code pointed to an internal issue, my experience with these GM trucks told me to check the TCM first. The module is often located right next to the battery, where it’s exposed to heat and vibrations. After a quick swap with one of our pre-programmed TCMs, all codes cleared and the truck shifted perfectly on the test drive. A 30-minute fix saved the customer from a needless $3,000+ transmission replacement.
Is Your Suburban Showing These Telltale Signs?
A failing TCM can cause a variety of frustrating and concerning symptoms. If you’re experiencing any of the following, this module is the likely solution for your 2007-2008 Suburban 1500 Transmission Control Module.
- ✔ Jarring, harsh, or delayed gear shifts.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758, or other solenoid-related faults.
- ✔ Unexplained drops in fuel economy.
- ✔ Inability to shift into higher or lower gears.
- ✔ Complete loss of communication with the transmission.
A Straightforward Guide to Installation
Replacing the TCM on your Suburban is a job most DIYers can handle in their own driveway in under an hour. For the 2007-2008 Suburban 1500, the module is typically located in the engine bay, right next to the battery.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the onboard systems.
- Locate the TCM: Find the module mounted next to the battery. It’s a silver box with several large electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harnesses. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Reconnect the wiring harnesses, ensuring they click securely into position.
- Reconnect and Verify: Reconnect the negative battery terminal. Start the vehicle and allow it to idle for a few minutes. Check for any warning lights and take it for a test drive to confirm that normal shifting has been restored.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page is dedicated to the 2007-2008 Suburban 1500 Transmission Control Module, it also fits the following models. Always verify your part number for a perfect match.
- Chevrolet Avalanche 1500 (2007-2008)
- Chevrolet Silverado 1500 (2007-2013)
- Chevrolet Tahoe (2007-2009)
- GMC Sierra 1500 (2007-2013)
- GMC Yukon & Yukon XL 1500 (2007-2009)
- Cadillac DTS (2006-2011)
- Chevrolet Impala (2006-2011)
- And many more GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. This module arrives pre-programmed to your vehicle’s specific VIN. This makes it a true plug-and-play solution, saving you the time and expense of a dealership visit.
What is the location of the TCM on a 2008 Suburban 1500?
On most 2007-2008 Suburban 1500 models, the Transmission Control Module is located in the engine compartment, mounted on a bracket right next to the battery.
Will this fix a P0700 code?
A P0700 is a generic code indicating a fault has been registered within the transmission control system. Often, a failing TCM is the root cause that triggers this code along with other, more specific codes. Replacing a faulty TCM will resolve the P0700 and its related codes.
Is there a core charge for this part?
No, there is no core charge. You can keep your old part, eliminating the hassle and expense of shipping it back.
What transmissions is this T42 module compatible with?
This T42 TCM is designed for vehicles with 4-speed automatic transmissions, including the popular 4L60E, 4L65E, 4L70E, and 4L80E found in a vast range of GM vehicles.