If you’re dealing with the headaches of a faulty transmission in your 2007-2008 GMC Yukon XL 1500, you know how frustrating it can be. Unpredictable shifting, warning lights on the dash, and a vehicle that won’t get out of its own way can ruin your driving experience. This T42 Transmission Control Module (TCM), part number 24255280, is the definitive solution to restore the crisp, reliable performance your GM truck or SUV was built for.
As the electronic brain of your automatic transmission (like the 4L60E, 4L65E, or 4L70E), the TCM is responsible for every gear change, torque converter lockup, and pressure regulation. When it fails, the symptoms are impossible to ignore. This replacement module is meticulously prepared and comes pre-programmed to your vehicle’s specific VIN, making it a true plug-and-play fix that eliminates the need for a costly trip to the dealership.
From the Diagnostic Bay
I remember a customer bringing in his ’08 Tahoe, the family hauler, with a classic complaint: ‘It feels like it’s stuck in mud.’ The truck was in limp mode, locked in 3rd gear, and the check engine light was on with a P0700 code. After a quick scan confirmed communication issues with the TCM, we knew where to look. Instead of a multi-day stay at a dealership waiting for programming, we installed one of these pre-flashed T42 modules. In under an hour, the truck was shifting perfectly, the codes were cleared, and the customer was back on his way. That’s the power of a reliable, pre-programmed part.
Is Your Yukon Exhibiting These Telltale Signs?
A failing 2007-2008 Yukon XL TCM often shows clear symptoms. If you’re experiencing any of the following, a faulty module is the likely culprit:
- ✔ Abrupt, harsh, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle is stuck in a single gear (limp mode) and won’t shift up or down.
- ✔ The Check Engine Light or a specific transmission warning light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid Errors), or other communication codes.
- ✔ A noticeable drop in fuel efficiency or signs of the transmission overheating.
- ✔ Complete loss of communication with the transmission, leading to a no-start or no-shift condition.
Get Back on the Road: A Simple Installation Guide
One of the best features of this module is its straightforward installation. You don’t need to be a master mechanic to get this job done right in your own driveway. For most GM trucks and SUVs like the Yukon, the TCM is located in the engine bay, typically next to the battery.
- Safety First: Before you begin, disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: Find the old TCM. On your Yukon XL, it’s usually mounted on a bracket right next to the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs, so be gentle. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place. Reconnect the electrical connectors, ensuring they click securely into position.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and let it run for a few minutes. While our programming handles the critical data, it’s always good practice to use a basic OBD2 scan tool to clear any stored fault codes.
Verified Fitment Across the GM Family
While this is the perfect 2007-2008 Yukon XL TCM, this versatile T42 module also serves as a direct replacement for a wide range of General Motors vehicles. It is interchangeable with part numbers 24252114, 24234503, 24230461, and others. Compatibility includes:
- ✔ GMC: Yukon, Sierra 1500/2500, Savana, Envoy
- ✔ Chevrolet: Tahoe, Silverado 1500/2500, Suburban, Avalanche, Express, Impala, Cobalt, HHR
- ✔ Cadillac: DTS
- ✔ Buick: LaCrosse, Lucerne, Rainier
- ✔ Pontiac: G6, Grand Prix
- ✔ And many more models from 2006-2014.
Frequently Asked Questions
Does this module require any additional programming?
No. This is the biggest benefit. We program the module to your vehicle’s VIN before shipping. It arrives ready for installation, with no need for a scan tool or a visit to the dealer for programming.
What does the TCM actually do?
The Transmission Control Module acts as the computer for your automatic transmission. It takes data from engine and vehicle speed sensors to control shift solenoids, regulate hydraulic pressure, and manage when the torque converter locks up for maximum efficiency.
Where do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your driver’s side door jamb sticker, on your insurance card, or by looking through the driver’s side of the windshield at the dashboard.
Is a core charge required for my old part?
No, there is no core charge. You can keep your old module or dispose of it without the hassle of sending it back.