If your 2007-2008 GMC Yukon XL 1500 is suffering from erratic shifting, getting stuck in gear, or throwing transmission-related 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 bring a perfectly good truck to a standstill. This isn’t just an annoyance; it’s a critical failure that compromises your vehicle’s performance and safety. This T42 TCM, part number 24234274, is the definitive, hassle-free solution to restore the crisp, predictable shifting your GM vehicle had from the factory.
The biggest headache with replacing electronic modules has always been the mandatory, and often expensive, trip to the dealership for programming. We eliminate that step entirely. We pre-program this module to your vehicle’s specific VIN before it ships, loading it with the latest GM software updates. This means when it arrives at your door, it’s a true plug-and-play component. You can get your truck or SUV back on the road in under an hour, without special tools or costly diagnostic equipment.
Is Your Yukon Exhibiting These Transmission Faults?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution. In my shop, over 80% of GM trucks from this era with these symptoms trace back to a failing TCM.
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear only).
- ✔ The check engine light is on with Diagnostic Trouble Codes (DTCs) like P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid codes), or communication errors.
- ✔ Inability to upshift or downshift, leading to poor acceleration and terrible fuel economy.
- ✔ Intermittent loss of communication with the TCM, causing unpredictable behavior.
- ✔ A complete failure to engage any gear.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Sierra with classic limp-mode symptoms. Another shop had already replaced two shift solenoids, convinced it was an internal transmission issue. The problem persisted. When I connected my scan tool, I noticed intermittent communication drops with the TCM, a tell-tale sign the module itself was failing, not the components it commands. We installed a VIN-programmed TCM, and the truck was shifting perfectly in 20 minutes. This saved the customer from a costly and unnecessary transmission rebuild.
A Straightforward Guide to Installation
Replacing the 2007-2008 Yukon XL 1500 TCM is a job most DIYers can handle with basic hand tools. For this specific vehicle, the module is conveniently located in the engine bay, right next to the battery.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before starting work.
- Locate the Module: Open the hood and find the TCM mounted on a bracket next to the battery.
- Disconnect the Wiring: Carefully unclip the two large electrical connectors from the old module. There are typically release tabs you’ll need to press or slide.
- Remove the Old TCM: Unbolt the module from its mounting bracket. It’s usually held on by a few 10mm bolts.
- Install the New Module: Mount your new, pre-programmed TCM onto the bracket and securely fasten the bolts.
- Reconnect Everything: Plug the electrical connectors firmly into the new module until they click. Reconnect your battery terminal.
- Final Steps: Start the vehicle. The new module is ready to go, but it’s good practice to use a basic scan tool to clear any old stored codes from the ECU.
Verified Compatibility for Your GM Vehicle
This T42 TCM is a direct replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is an exact match for part number 24234274 and interchanges with many others, including 24252114, 24234503, and 24239224. Please use the fitment list below to confirm it’s the right part for your specific model and year.
This part is a confirmed fit for the following:
- GMC YUKON XL 1500: 2007-2008 (Transmission; next to battery)
- Chevrolet Tahoe: 2007-2009 (Transmission; next to battery)
- Chevrolet Silverado 1500: 2007-2013 (Transmission; next to battery, non-hybrid)
- GMC Sierra 1500: 2007-2013 (Transmission; next to battery, non-hybrid)
- Chevrolet Suburban 1500: 2007-2008 (Transmission; next to battery)
- Chevrolet Avalanche 1500: 2007-2008 (Transmission; next to battery)
- …and many other GM cars, trucks, and SUVs from 2006-2014. Please check the full fitment chart.
Frequently Asked Questions
Frequently Asked Questions
What exactly does a Transmission Control Module do?
The TCM is the ‘brain’ of your automatic transmission. It takes data from vehicle sensors (like speed, throttle position, and engine RPM) to decide the perfect moment to shift gears, control torque converter lockup for fuel efficiency, and monitor the transmission’s health.
Why is VIN programming so important?
VIN programming loads your vehicle’s specific software, including gear ratios, tire size, and shift strategies, onto the module. Without it, a new TCM won’t work correctly, if at all. Our service saves you the time, cost, and hassle of a dealership visit for this mandatory step.
Can I install this myself or do I need a mechanic?
This is a very DIY-friendly part. If you can use a basic wrench and disconnect a battery, you can install this module. For your 2007-2008 Yukon XL 1500 TCM, the location next to the battery makes it one of the easiest to access.
My old part has a different number on it. Will this still work?
Yes, GM uses many different part numbers for the same component over the years. This module, 24234274, is a service replacement for numerous other numbers. As long as your vehicle is on our compatibility list, this part will function correctly.
Is there a core charge for my old part?
No, there is no core charge. You are not required to send your old, faulty module back to us, which simplifies the process for you.