Is your 2007-2008 GMC Yukon XL 1500 suffering from unpredictable, harsh shifting, or getting stuck in gear? A failing Transmission Control Module (TCM) is one of the most common culprits behind these frustrating and potentially unsafe driving conditions. As the electronic brain of your automatic transmission, the TCM dictates every gear change. When it falters, your vehicle’s performance and reliability suffer. This replacement T42 TCM, part number 24256960, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
Over my 20 years in diagnostics, I’ve seen countless GM trucks and SUVs come into the bay with transmission complaints that stump other mechanics. Often, the issue isn’t the transmission itself, but this critical control unit. This module is engineered to meet or exceed original equipment standards, restoring the precise, smooth shifting you expect from your Yukon XL. By providing us with your VIN during checkout, our technicians will flash the module with the latest GM software, ensuring it communicates flawlessly with your vehicle’s Powertrain Control Module (PCM) right out of the box. This eliminates the need for an expensive trip to the dealership for programming.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Yukon XL 1500 with a perplexing issue: it would intermittently refuse to shift out of 2nd gear, but only after driving for 20+ minutes. The check engine light was on, showing a generic P0700 (Transmission Control System Malfunction). We checked the fluid, tested the solenoids, and inspected the wiring harness—all were fine. The problem was heat-related failure within the original TCM. After swapping in one of our VIN-programmed T42 modules, the problem vanished completely. The customer saved hundreds compared to a dealership diagnosis and repair, and drove away with a reliable vehicle.
Is Your Yukon Exhibiting These Telltale Signs?
A faulty 2007-2008 Yukon XL 1500 Transmission Module can manifest in several ways. If you’re experiencing any of the following, a replacement TCM is the likely solution:
- âś” Abrupt, harsh, or jerky gear changes.
- âś” The transmission seems to slip or delay when shifting between gears.
- âś” Your vehicle is stuck in “limp mode” (usually 2nd or 3rd gear) to prevent further damage.
- âś” The Check Engine Light or Transmission Warning Light is illuminated, often with Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid-related codes.
- âś” A noticeable decrease in fuel economy due to inefficient shifting.
- âś” Complete failure to shift, either up or down.
Your 30-Minute Path to a Smooth Ride
One of the best features of this module is its straightforward installation. You don’t need to be a professional mechanic to get your Yukon back in top shape. For the 2007-2008 Yukon XL 1500, the TCM is conveniently located in the engine bay, 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 system.
- Locate the Module: Open the hood and find the TCM mounted next to the battery on the driver’s side.
- Disconnect and Remove: Carefully unclip the two large electrical connectors. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the two electrical connectors. You’ll hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scan tool to clear any stored transmission codes. Start the vehicle and enjoy a smooth test drive!
Verified Fitment for Your General Motors Vehicle
This T42 TCM is a direct replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with part numbers 24252114, 24234503, 24230461, 24256960, and more. While this page focuses on the 2007-2008 Yukon XL 1500 Transmission Module, it also fits models including:
- âś” Chevrolet Silverado, Tahoe, Suburban, Avalanche, Express Van
- âś” GMC Sierra, Yukon, Savana Van
- âś” Cadillac DTS, Buick LaCrosse, Lucerne
- âś” Pontiac G6, Grand Prix
- âś” Hummer H3, Saab 9-7X, and many more.
Frequently Asked Questions
Does this module really not require a trip to the dealer?
That’s correct. When you provide your VIN at checkout, we program the module specifically for your vehicle. It arrives ready to install, with no additional programming or calibration needed.
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 at your convenience, making the process hassle-free.
What tools do I need for installation?
For most models, including the Yukon XL, you’ll only need a basic socket set to unbolt the module and disconnect the battery. No specialized tools are required.
Will this fix a P0700 code?
A P0700 code is a general code indicating the TCM has detected a fault. Often, replacing a faulty TCM will resolve the P0700 code along with the more specific codes that caused it. This part is a direct fix for internal TCM failure.
What if I have a different part number?
This module replaces a wide range of T42 TCM part numbers. Please check the interchange list provided or contact our expert support team with your vehicle information to confirm compatibility.