Restore Peak Transmission Performance in Your GMC
Is your 2007-2008 GMC Yukon XL 1500 suffering from erratic shifting, getting stuck in gear, or displaying a check engine light with transmission-related codes? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating gear changes, managing torque converter clutch lockup, and monitoring system health. When it fails, drivability is severely compromised. This genuine OEM-quality T42 TCM, service part number 24252114, is the definitive solution to restore the smooth, reliable performance your vehicle was built for.
From the Diagnostic Bay
We had a 2008 Sierra come in with a classic complaint: harsh 1-2 upshifts and a P0752 code for Shift Solenoid ‘A’ Stuck On. The owner had already replaced the solenoid twice with no change. After a quick data scan, we saw that the TCM was commanding the solenoid on, but the pressure readings were erratic. Instead of throwing more parts at the transmission, we identified the root cause: an internal fault in the original TCM. Installing a VIN-programmed module like this one corrected the command signal, cleared the code, and had the truck shifting perfectly in under an hour. It’s a reminder that sometimes the problem isn’t the component being controlled, but the controller itself.
The Importance of a Programmed 2007-2008 Yukon XL 1500 TCM
Unlike a generic, off-the-shelf part, this module comes pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures that the TCM has the correct software and calibration files for your Yukon’s exact configuration, including its engine, axle ratio, and tire size. This eliminates the need for an expensive trip to the dealership for programming. With our VIN-programmed module, installation is a true plug-and-play process. You simply install the part, and your vehicle’s transmission will operate according to precise factory specifications, ensuring optimal shift points, fuel economy, and longevity.
Symptoms of a Failing Transmission Module
- ✔️ Harsh, delayed, or unpredictable gear shifts.
- ✔️ Vehicle enters “limp mode,” often stuck in 2nd or 3rd gear.
- ✔️ Illumination of the Check Engine Light or Transmission Warning Light.
- ✔️ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0755, or other solenoid-related faults.
- ✔️ Failure to shift into higher or lower gears.
- ✔️ A noticeable decrease in fuel efficiency.
- ✔️ Complete loss of communication with the transmission module.
Replacing your faulty 2007-2008 Yukon XL 1500 TCM is not just about fixing a symptom; it’s about preventing further damage. A malfunctioning module can cause excessive wear on clutches, bands, and other internal transmission components, leading to a much more costly mechanical failure down the road. This module is a direct replacement for a wide range of GM vehicles using the T42 controller, and is interchangeable with part numbers like 24234503, 24230461, 24242391, and 24256960.
Frequently Asked Questions
What is VIN programming and why is it required?
VIN programming loads your vehicle’s specific software and calibration files onto the TCM. Every vehicle is slightly different, and this process ensures the module communicates correctly with the engine and other systems for proper shift timing, pressure control, and performance. Our service does this for you, so it’s ready to install out of the box.
Is this a difficult part to install myself?
For most DIYers with basic tools, this is a straightforward installation. On the 2007-2008 Yukon XL 1500, the TCM is typically located in the engine compartment, next to the battery. The process involves disconnecting the battery, unplugging the electrical connectors, unbolting the old module, and installing the new one. The entire job usually takes less than 30 minutes.
Will this module fit other GM vehicles?
Yes, this T42 TCM is compatible with a wide array of 2006-2014 GM vehicles, including the Chevrolet Silverado, Tahoe, Impala; GMC Sierra; Cadillac DTS; and Buick LaCrosse, among others. Always verify the part number or consult our fitment guide to ensure it’s the correct module for your specific application.
Do I need to return my old part (core charge)?
No, there is no core charge for this part. You can keep your old module or dispose of it at your convenience, saving you the time and hassle of a core return process.
What happens if I don’t replace a bad TCM?
Continuing to drive with a faulty TCM can lead to poor fuel economy, unsafe driving conditions (like delayed engagement in traffic), and can eventually cause severe, irreversible mechanical damage to your transmission’s internal components, potentially requiring a complete transmission rebuild.