Is Your 2007-2008 Yukon XL 1500 Shifting Erratically?
If you’re experiencing harsh shifting, delayed gear engagement, or your GMC Yukon XL 1500 is stuck in ‘limp mode,’ a failing Transmission Control Module (TCM) is the likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change and ensuring smooth, efficient operation. When it begins to fail, it can cause a cascade of frustrating and potentially damaging issues, from poor fuel economy to a complete inability to shift gears, often accompanied by a check engine light or transmission warning on your dash.
This genuine OEM-quality T42 Transmission Control Module is the definitive solution for your vehicle. It is professionally programmed to your vehicle’s specific VIN, ensuring it works perfectly right out of the box without any need for expensive dealership visits for programming. Restore the factory performance and reliability of your transmission with a part designed to meet and exceed original specifications.
From the Diagnostic Bay
We had a 2008 Yukon XL come into the shop with a classic complaint: intermittent hard 1-2 shifts and a P0700 trouble code. The owner had already replaced two shift solenoids based on advice from a forum, but the problem persisted. After a quick scan, we saw erratic data from the TCM. Instead of continuing to replace internal transmission parts, we installed one of our VIN-programmed T42 modules. The entire job took less than 30 minutes. After clearing the codes, the Yukon shifted like it just rolled off the assembly line. It’s a perfect example of how correctly diagnosing the electronic controller saves time, money, and unnecessary mechanical work.
Signs Your Yukon XL TCM is Failing
- ✔ Erratic Shifting: Your transmission may slam into gear, hesitate between shifts, or feel like it’s slipping.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light is illuminated on your dashboard. Common codes include P0700, P0750, P0755, and other solenoid-related faults.
- ✔ Stuck in Gear: The vehicle may enter a fail-safe or “limp” mode, often getting stuck in 2nd or 3rd gear to prevent further damage.
- ✔ No Upshift or Downshift: The transmission refuses to shift into higher gears as you accelerate or downshift as you slow down.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lock-up managed by a faulty TCM can lead to a noticeable drop in MPG.
- ✔ Delayed Engagement: A significant delay when shifting from Park into Drive or Reverse is a common symptom.
Why Choose Our 2007-2008 Yukon XL TCM?
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The most critical aspect of replacing a modern TCM is the programming. Our modules are pre-programmed using the latest GM software updates tied directly to your vehicle’s VIN. This process ensures that the module communicates flawlessly with your vehicle’s Engine Control Module (ECM) and other systems, optimizing shift points, torque converter strategy, and fuel efficiency. By choosing our 2007-2008 Yukon XL TCM, you are bypassing the costly and time-consuming step of having the vehicle towed to a dealership for programming.
Plug-and-Play Installation
Installation is straightforward for any DIY mechanic or professional technician. On the 2007-2008 Yukon XL 1500, the TCM is typically located in the engine bay, next to the battery. Simply disconnect the battery, unbolt the old module, unplug the electrical connectors, and install the new one in its place. Reconnect everything, and you’re ready to go. No core charge means you can keep your old part without any hassle.
This module is a direct replacement for multiple part numbers, including 24239926, 24252114, 24234503, and others listed in the fitment data. Restore the dependable performance your GMC was built for. Don’t let a faulty TCM keep you off the road—get the right part, programmed correctly, and fix your vehicle with confidence.
Frequently Asked Questions
Do I need to get this TCM programmed by a dealer?
No. This Transmission Control Module comes fully pre-programmed to your vehicle’s specific VIN. It is ready for installation right out of the box, saving you a trip to the dealership and additional programming fees.
Where is the TCM located on my 2007 Yukon XL 1500?
On the 2007-2008 GMC Yukon XL 1500, the TCM is typically found in the engine compartment, mounted next to the battery. Always disconnect the battery’s negative terminal before starting the replacement.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a failing TCM is a very common cause, this code can also be triggered by other transmission issues. However, if you are experiencing shifting problems along with the P0700 code, replacing the TCM is the most likely solution.
Is there a core charge for this part?
No, there is no core charge required for this module. You can keep or dispose of your old part at your convenience without needing to return it.
What is the warranty on this 2007-2008 Yukon XL TCM?
This part comes with a standard one-year warranty, ensuring peace of mind and protecting your investment against any manufacturing defects.