If you’re dealing with a 2007-2008 GMC Yukon XL 1500 that’s shifting erratically, banging into gear, or stuck in limp mode, you know how frustrating and concerning it can be. As a technician with over two decades of experience, I’ve seen countless GM trucks and SUVs come into the bay with these exact issues. More often than not, the culprit isn’t a catastrophic mechanical failure, but a faulty Transmission Control Module (TCM). This T42 TCM, part number 24235754, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
A Technician’s Notebook
I remember a 2008 Yukon XL that came in with a P0751 code (Shift Solenoid A Performance/Stuck Off) and a nasty 1-2 shift that felt like getting rear-ended. The owner had already replaced the solenoid inside the pan, but the problem persisted. This is a classic scenario where the TCM is the root cause. The module’s internal drivers for the solenoids fail, sending incorrect signals. We installed a VIN-programmed T42 module, cleared the codes, and the truck shifted like it just rolled off the factory floor. This simple swap saved the customer from a costly and unnecessary transmission rebuild.
The Brains Behind the Brawn: Why a Programmed TCM is Essential
The TCM is the computer that orchestrates every move your automatic transmission makes—from shift timing and pressure to torque converter lockup. When it fails, communication breaks down, leading to the performance problems you’re experiencing. Our service eliminates the biggest headache of this repair: programming. We flash the module with the latest GM software updates matched to your VIN before it ships. This means no expensive trips to the dealership, no special scan tools required for setup, and a guaranteed fix for software-related diagnostic trouble codes (DTCs) right out of the box. This is the most reliable way to service your 2007-2008 Yukon XL TCM.
Is Your Yukon Exhibiting These Telltale Symptoms?
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ Vehicle is stuck in a single gear (often 2nd or 3rd), also known as “limp mode”.
- ✔ The Check Engine Light or Transmission Warning Light is illuminated.
- ✔ You’ve pulled DTCs like P0700 (Transmission Control System Malfunction), P0750-P0758 (solenoid codes), or communication codes.
- ✔ A noticeable drop in fuel economy or the transmission seems to be overheating.
- ✔ Complete loss of communication with the transmission module.
DIY Installation Guide for Your Yukon XL
Replacing the 2007-2008 Yukon XL TCM is a straightforward job that most DIYers can complete in their driveway in under 30 minutes. For your specific vehicle, it’s typically located in the engine bay, right next to the battery.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: Find the TCM mounted next to the battery in your Yukon’s engine compartment. It will have several large electrical connectors attached.
- Disconnect and Remove: Carefully release the locking tabs on the electrical connectors and pull them straight out. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely plug in the electrical connectors until they click, ensuring a solid connection.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and let it run for a moment. If you have a basic scan tool, it’s good practice to clear any stored DTCs. Take a test drive to confirm the smooth shifting performance.
Verified Fitment Across GM Models
While this is the perfect solution for your Yukon XL, this T42 module is also compatible with a wide range of GM vehicles. It is a direct replacement for part numbers 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, and more. Key compatible models include:
- Chevrolet Silverado, Tahoe, Suburban, Express Van (2006-2014)
- GMC Sierra, Yukon, Savana Van (2006-2014)
- Cadillac DTS, Escalade (check specific years)
- Hummer H3 (2008-2010)
- Buick LaCrosse, Lucerne (2006-2011)
- Pontiac G6, Grand Prix (2006-2010)
- Chevrolet Cobalt, HHR, Impala, Malibu (check specific years)
- Saturn Vue, Aura, Ion (check specific years)
- GMC Canyon / Chevrolet Colorado (2008-2012)
- Saab 9-7X (2006-2009)
- And many more listed in the fitment chart.
Frequently Asked Questions about the 2007-2008 Yukon XL TCM
Frequently Asked Questions
Do I need to take my vehicle to the dealer after installation?
No. This module comes fully programmed to your vehicle’s VIN. It is a plug-and-play installation that does not require any additional programming from a dealer or mechanic.
Is this a new or used part?
This is a high-quality, OEM-spec component that has been expertly inspected and programmed to ensure reliability. It is backed by our one-year warranty for your peace of mind.
What is a core charge?
There is no core charge for this part. You are not required to send your old, faulty module back to us, which saves you time and shipping costs.
Will this fix a P0700 code?
A P0700 code is a general fault request from the TCM to the Engine Control Module (ECM) to turn on the Check Engine Light. While this module often resolves the underlying issue causing the P0700, you should scan for other ‘P’ codes to identify the specific transmission fault (e.g., solenoid or sensor circuits).
How do I provide my VIN for programming?
You will be prompted to enter your vehicle’s 17-digit VIN during the checkout process. This is crucial for us to program the module correctly for your specific Yukon XL.