Is Your GMC Yukon Shifting Erratically?
If your 2007, 2008, or 2009 GMC Yukon is experiencing harsh shifts, delayed gear engagement, or has entered a frustrating “limp mode,” a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change, managing torque converter lockup, and monitoring overall transmission health. When it fails, it can cause a wide range of drivability issues, from poor fuel economy to a complete inability to shift gears, often illuminating the check engine light on your dash.
From the Diagnostic Bay
We recently had a 2008 Yukon XL come into the shop with a classic complaint: stuck in 3rd gear and a check engine light on. The owner had already spent a significant amount of money at another shop that insisted on a full transmission rebuild. However, a quick scan showed a P0700 code (Transmission Control System Malfunction) and several solenoid circuit codes. We knew from experience that multiple, simultaneous solenoid codes often point to an electrical controller issue, not a mechanical failure. We installed a VIN-programmed T42 TCM, cleared the codes, and the vehicle shifted perfectly. The customer saved thousands by correctly diagnosing the electronic component first.
The Direct Solution: A VIN-Programmed 2007-2009 Yukon TCM
Don’t let a faulty module sideline your SUV. This OEM-quality T42 Transmission Control Module is the definitive solution for restoring your vehicle’s performance and reliability. The most critical feature is our complimentary VIN programming service. We flash the module with your vehicle’s specific Vehicle Identification Number and the latest GM software updates before it ships. This ensures it communicates flawlessly with your Yukon’s other computers, like the Engine Control Module (ECM), right out of the box. You get a true plug-and-play installation without the need for an expensive trip to the dealership for programming.
Common Symptoms of a Failing TCM
- ✔ Harsh, erratic, or delayed gear shifting.
- ✔ Vehicle is stuck in one gear (often called limp mode or fail-safe mode).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults are present.
- ✔ The transmission seems to slip between gears.
- ✔ Poor acceleration and a noticeable decrease in fuel efficiency.
- ✔ Complete failure to shift or engage a gear.
Easy Installation and Guaranteed Compatibility
Replacing the TCM on your Yukon is a straightforward job that can typically be completed in under an hour with basic hand tools. On most 2007-2009 Yukon models, the module is conveniently located in the engine compartment, often next to the battery. Simply disconnect the battery, unbolt the old module, unplug the electrical connectors, and install the new one in its place. Once the new module is installed and the battery is reconnected, the vehicle is ready to go. This module is a direct replacement for a wide range of GM service numbers, including 24252114, 24234503, 24242391, and YNXS, ensuring a perfect fit for your vehicle.
Frequently Asked Questions
What does VIN programming mean for me?
VIN programming means we load your vehicle’s specific factory software onto the module before we ship it. This makes the installation process simple—just plug it in and you’re ready to drive. It eliminates the need for expensive and time-consuming programming at a dealership.
Will this fix my specific transmission problem?
This module is designed to correct issues directly caused by a faulty TCM, such as electronic shifting errors, communication faults (like code P0700), and erratic solenoid behavior. If you are experiencing any of the symptoms listed above, there is a very high probability that this part will resolve your problem.
Is this part difficult to install myself?
For most DIY mechanics, the installation is quite simple. The TCM is typically located in an accessible spot in the engine bay. Basic hand tools are all that’s required. Always remember to disconnect the negative battery terminal before starting the replacement to ensure safety and help reset the vehicle’s electronic systems.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep your old module, recycle it, or dispose of it at your convenience without any extra fees or hassle.
Is this compatible with other GM vehicles?
Yes, this T42 TCM is compatible with a wide array of GM vehicles from 2006-2014 that use the 4L60E, 4L65E, 4L70E, or 4L80E automatic transmissions. This includes models like the Chevrolet Silverado, Tahoe, Impala, GMC Sierra, and Cadillac DTS, among many others.