Restore Peak Performance to Your GMC Yukon’s Transmission
Is your 2007, 2008, or 2009 GMC Yukon suffering from erratic shifting, delayed gear engagement, or getting stuck in limp mode? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, and when it malfunctions, it can disrupt your entire driving experience. This genuine OEM-quality T42 TCM, part number 24256960, is the definitive solution to get your SUV back on the road with the smooth, reliable performance you expect.
From the Diagnostic Bay
We recently had a 2008 Yukon in the shop with a persistent P0752 code (Shift Solenoid A Stuck On). The owner had already replaced the solenoid twice at another shop, but the check engine light and harsh 1-2 shift kept returning. After a quick diagnostic scan and checking the wiring harness, we identified the root cause: the driver circuit inside the original TCM was failing intermittently. We installed one of our VIN-programmed T42 modules, cleared the codes, and the truck has been shifting perfectly ever since. It’s a common scenario where chasing codes leads to replacing good parts, when the controller itself is the actual problem.
Diagnosing Your 2007-2009 Yukon Transmission Module
A faulty TCM can manifest in various ways, often being misdiagnosed as an internal transmission failure. Before considering a costly transmission rebuild, check for these common symptoms. If your Yukon is exhibiting any of these behaviors, a failing TCM is the most likely culprit.
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ Vehicle is stuck in a single gear, often referred to as “limp mode,” to prevent further damage.
- ✔ The check engine light or a specific transmission warning light is illuminated on your dash.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related codes are present.
- ✔ A noticeable decrease in fuel economy due to inefficient shifting and torque converter operation.
- ✔ Complete loss of communication with the transmission, resulting in a no-shift condition.
The Plug-and-Play Advantage: VIN Programming Included
What sets this module apart is our expert VIN programming service. We flash the unit with your Yukon’s specific Vehicle Identification Number and the latest GM software updates before it ships. This ensures that the TCM is perfectly calibrated to your vehicle’s factory settings for engine size, tire ratio, and other critical parameters. The result is a true plug-and-play installation—no expensive trips to the dealership for programming are required. Simply install the module, and you’re ready to go.
This T42 TCM is a direct replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with numerous service numbers, including 24252114, 24234503, 24230461, and 24243921, guaranteeing a perfect fit for your repair needs.
Frequently Asked Questions
What does “VIN-programmed” mean for my Yukon?
VIN programming means we load your vehicle’s specific factory software and calibrations onto the module before we ship it to you. This makes the unit ready for installation right out of the box, ensuring it communicates perfectly with your Yukon’s engine and other systems without needing a trip to the dealer.
Do I need any special tools for installation?
Basic hand tools are typically all that’s required for installation. On most 2007-2009 Yukon models, the TCM is conveniently located next to the battery in the engine compartment. The most important step is to disconnect the vehicle’s battery before starting the replacement to ensure the system resets properly.
Will this module fix a P0700 trouble code?
A P0700 code is a general transmission fault request from the TCM to the Engine Control Module (ECM) to turn on the check engine light. While the P0700 itself doesn’t pinpoint the problem, it’s often triggered by internal TCM failures. Replacing a faulty TCM will resolve the underlying issue that caused the P0700 code to set.
Is there a core charge for this part?
No, there is no core charge for this transmission control module. You can keep your old part without the hassle of returning it, saving you time and money.
How do I know this is the correct part for my vehicle?
This module is a confirmed fit for 2007-2009 GMC Yukon models. You can also verify by matching the part number 24256960 or one of the interchangeable service numbers listed in the description to your existing part.