Restore Flawless Shifting to Your GMC Yukon XL 1500
If you’re dealing with the frustration of a transmission that won’t shift correctly, goes into limp mode, or throws confusing error codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen firsthand how a failing Transmission Control Module (TCM) can sideline a perfectly good vehicle. This T42 TCM, part number 24230461, is the definitive solution for your 2007-2008 GMC Yukon XL 1500, designed to restore the crisp, reliable performance you depend on.
The TCM is the brain of your automatic transmission, managing everything from gear changes to torque converter lockup. When it fails, symptoms can range from annoying to dangerous. This module is expertly pre-programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership visits for programming. It’s a direct-fit, plug-and-play solution that gets you back on the road quickly and confidently.
A Technician’s Notebook
I remember a 2007 Yukon XL 1500 that came into the shop with a classic intermittent problem. The owner complained of harsh 1-2 shifts, but only after the vehicle was fully warmed up. We couldn’t replicate it on short test drives. After checking fluid levels and solenoids, which all tested fine, we suspected the TCM. Heat soak was causing an internal fault in the module’s circuitry. We installed a VIN-programmed T42 TCM, and the problem vanished instantly. The customer was thrilled to have his smooth-shifting family hauler back without a costly transmission rebuild.
Is Your Yukon Exhibiting These Telltale Signs?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, this module is likely the solution you need:
- âś” Harsh, slamming, or delayed gear shifts.
- âś” The vehicle is stuck in a single gear (often called ‘limp mode’).
- âś” Check Engine Light or Transmission Warning Light is on.
- âś” Diagnostic Trouble Codes (DTCs) such as P0700 (Transmission Control System Malfunction), P0750-series (Shift Solenoid), or other transmission-related codes are present.
- âś” A sudden drop in fuel economy.
- âś” The transmission refuses to upshift or downshift as expected.
Plug-and-Play Installation: Get Back on the Road Fast
Installing your new 2007-2008 Yukon XL 1500 TCM is a straightforward job that most DIYers can complete in under 30 minutes with basic hand tools. For your specific model, the TCM is conveniently located in the engine compartment, right next to the battery.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work. This prevents short circuits and helps reset the vehicle’s electronic systems.
- Locate the Module: Open the hood and find the TCM mounted next to the battery. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses from the old TCM. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed TCM onto the bracket and securely tighten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While our VIN programming handles the critical setup, it’s always a good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the engine and enjoy your restored transmission performance!
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct replacement for part number 24230461 and is interchangeable with many other GM service numbers. While it is a perfect fit for the 2007-2008 Yukon XL 1500 TCM requirement, it also fits a wide range of other GM vehicles, including:
- Chevrolet Silverado, Tahoe, Suburban, Avalanche, Express, Impala, Cobalt, HHR
- GMC Sierra, Yukon, Savana, Envoy, Canyon
- Buick LaCrosse, Lucerne, Rainier
- Cadillac DTS
- Pontiac G6, Grand Prix
- Saturn Vue, Aura, Ion
- Hummer H3 & Saab 9-7X
This module is specifically for vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, 4L70E, and 4L80E.
Does this TCM require programming at a dealership?
Does this TCM require programming at a dealership?
No. This module comes pre-programmed to your vehicle’s VIN. You provide your VIN at checkout, and we flash the module with the latest GM software before shipping. This makes it a true plug-and-play installation, saving you time and money.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your old part or dispose of it without the hassle of returning it.
What tools do I need for installation?
For a 2007-2008 Yukon XL 1500, you will typically only need a basic socket set to remove the mounting bolts and a wrench to disconnect the battery terminal. No special diagnostic equipment is required for the installation itself.
Will this fix a P0700 trouble code?
Yes, very often. The P0700 code is a general code indicating the TCM has detected a fault. If the root cause is the module itself, replacing it with this pre-programmed unit will resolve the code and the underlying issue.