Restore Your Yukon’s Shifting Performance
Is your 2007-2009 GMC Yukon experiencing frustrating and unpredictable transmission issues? Symptoms like harsh shifting, getting stuck in one gear, or an illuminated check engine light are often traced back to a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating smooth gear changes, managing torque converter lockup, and monitoring overall transmission health. When it fails, it can make your reliable SUV feel unsafe and unpredictable. This replacement GM T42 TCM, service number 24239926, is the definitive solution to restore your vehicle’s factory performance and drivability.
From the Diagnostic Bay
We recently had a 2008 Yukon Denali towed in. The owner reported that it would suddenly refuse to shift out of what felt like 3rd gear, and the transmission temperature gauge was climbing. A quick scan revealed a P0700 (Transmission Control System Malfunction) and several solenoid-specific codes. After checking the wiring harness and fluid, we suspected the TCM. The internal circuits on these modules can fail from heat and vibration over time, causing intermittent communication loss with the solenoids. We installed one of our VIN-programmed T42 modules, cleared the codes, and the Yukon was shifting perfectly on the test drive. The customer was thrilled to have his vehicle back without a costly trip to the dealership for programming.
Why Choose Our Pre-Programmed 2007-2009 Yukon TCM?
The biggest hurdle in replacing a modern TCM is the need for vehicle-specific programming. Without it, the new module won’t communicate correctly with your Yukon’s engine computer and other systems. Our process eliminates this step entirely. We pre-program each module to your vehicle’s unique Vehicle Identification Number (VIN) before it ships. This ensures that it arrives ready for a true plug-and-play installation. Simply install the part, and you’re ready to go—no expensive dealership visits, no special tools, and no additional programming required. This direct-fit 2007-2009 Yukon TCM is engineered to meet or exceed original equipment specifications, ensuring long-term reliability for your 4-speed automatic transmission (4L60E, 4L65E, 4L70E).
Symptoms of a Failing T42 TCM
- ✔ Hard, erratic, or delayed gear shifts.
- ✔ Vehicle entering “limp mode,” often stuck in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults.
- ✔ Failure to upshift or downshift correctly.
- ✔ Decreased fuel economy and potential transmission overheating.
- ✔ Complete loss of communication with the transmission.
Simple Installation Process
Replacing the TCM on your GMC Yukon is a straightforward job that can be completed in your own driveway. On most 2007-2009 models, the module is conveniently located in the engine bay, often next to the battery. Disconnect the negative battery terminal, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect everything, and the job is done. Using a basic scan tool to clear any stored DTCs after installation is recommended. With no core charge, you can keep your old part without the hassle of returning it.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles and interchanges with numerous part numbers, including 24252114, 24234503, 24230461, 24239224, and 24256960. It is designed to work seamlessly with the factory systems in your GMC Yukon, Chevrolet Tahoe, Silverado, Suburban, and many other compatible models listed below, ensuring a perfect fit and flawless operation.
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before shipping. This makes it a plug-and-play installation, saving you time and the high cost of dealership programming.
Where is the TCM located on my 2008 GMC Yukon?
On most 2007-2009 GMC Yukon, Tahoe, and Silverado models, the Transmission Control Module is located in the engine compartment, typically mounted next to the battery or on the driver’s side strut tower.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault code, indicating that the TCM has detected a problem. While a faulty TCM is a very common cause, this code can also be triggered by other issues. However, if you are experiencing shifting problems along with this code, replacing the TCM is the most likely solution.
Is this a new or used part?
This is a high-quality, OEM-standard replacement part that has been expertly tested and prepared to ensure it meets strict performance criteria. It is backed by our one-year warranty for your peace of mind.
What is the warranty on this 2007-2009 Yukon TCM?
This transmission control module comes with a one-year replacement warranty, covering any defects in materials or workmanship. We stand behind the quality and reliability of our electronic components.