Restore Smooth, Reliable Shifting to Your GMC Yukon XL
If you’re dealing with the frustration of a transmission that won’t shift correctly, slams into gear, or has put your Yukon into limp mode, 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 an otherwise perfectly good vehicle. This T42 TCM, part number 24239224, is the definitive solution for your 2007-2008 Yukon XL 1500 TCM problems, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
The TCM is the brain of your automatic transmission, controlling everything from shift points to torque converter lockup. When it fails, communication between the engine and transmission breaks down, leading to the erratic behavior you’re likely experiencing. In my shop, the most common cause of these failures is heat and vibration, which compromises internal electronic components over time. This module is built to OEM specifications to withstand those harsh under-hood conditions, ensuring long-term reliability.
A Technician’s Notebook: The Ghost in the Transmission
A customer brought in their ’07 Yukon XL 1500 complaining of intermittent, violent 1-2 shifts and occasionally getting stuck in 3rd gear. They had already replaced two shift solenoids at another shop with no success. The scanner showed a generic P0700 (Transmission Control System Malfunction) code, but no specific solenoid faults. Experience told me to look at the controller. After confirming power and ground to the TCM were good, we swapped in one of our VIN-programmed T42 modules. The test drive was perfect—smooth shifts, no hesitation. The original TCM was failing internally, sending erratic signals that mimicked a solenoid issue. This case highlights why replacing the 2007-2008 Yukon XL 1500 TCM is often the correct fix when symptoms are inconsistent or multiple codes appear.
Is Your Yukon Exhibiting These Telltale Signs?
A faulty TCM will make its presence known. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- âś” Harsh, delayed, or unpredictable gear shifts.
- âś” The vehicle is stuck in a single gear (limp mode), often 2nd or 3rd.
- âś” Check Engine Light is on with transmission-related Diagnostic Trouble Codes (DTCs), such as P0700, P0750, P0753, P0758, or other solenoid circuit codes.
- âś” Failure to upshift or downshift, causing poor acceleration and high RPMs.
- âś” A noticeable drop in fuel economy.
- âś” Complete loss of communication with the transmission module (no-start or no-shift condition).
Your Straightforward 30-Minute Installation Guide
One of the best features of this module is its simple, no-hassle installation. Because we program it to your VIN, you don’t need a trip to the dealership. Here’s how you can get it done:
- 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’s memory.
- Locate the TCM: On the 2007-2008 Yukon XL 1500, the TCM is typically located in the engine compartment, right next to the battery. It’s a silver box with large electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses from the old TCM. 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 idle for a few minutes. If you have a basic scan tool, it’s good practice to clear any stored DTCs from the system. Take the vehicle for a test drive to confirm smooth shifting.
Verified Vehicle Fitment
This T42 TCM is a direct replacement for part number 24239224 and is compatible with a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page is focused on the 2007-2008 Yukon XL 1500 TCM, it also fits:
GMC: Yukon (07-09), Sierra 1500/2500 (07-13), Savana 1500/2500/3500 (06-14), Envoy (06-09)
Chevrolet: Tahoe (07-09), Silverado 1500/2500 (07-13), Suburban 1500 (07-08), Avalanche 1500 (07-08), Express 1500/2500/3500 (06-14), Impala (06-11), Cobalt (06-10), HHR (06-11), Colorado (08-12)
Cadillac: DTS (06-11)
Buick: LaCrosse (06-09), Lucerne (06-11), Rainier (06-07)
…and many other GM, Pontiac, Saturn, Hummer, and Saab models from 2006-2014. Please verify the part number for your specific application.
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. We handle all the programming for you. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready for immediate installation. This saves you hundreds of dollars in dealership programming fees.
Is this a new or used part?
This is a high-quality, OEM-standard replacement part that has been expertly prepared and programmed with the latest GM software. It is backed by our one-year warranty for your peace of mind.
What tools are required for installation?
Basic hand tools are all that’s needed. Typically, a simple socket set to remove the mounting bolts and a wrench for the battery terminal will be sufficient for the entire job.
Do I need to send my old part back?
No, there is no core charge for this module. You can keep your old part, eliminating the hassle and expense of return shipping.
Will this fix a P0700 check engine light code?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, a failing TCM is the root cause. Replacing the module with this programmed unit is a very common and effective solution for clearing a P0700 and any related transmission codes.