Restore Flawless Shifting to Your GMC Yukon
If you’re dealing with the frustration of a GMC Yukon that shifts harshly, gets stuck in gear, or throws transmission-related check engine lights, you’ve come to the right place. As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Transmission Control Module (TCM) can bring an otherwise reliable truck to a standstill. The T42 TCM is the electronic brain of your automatic transmission, and when it falters, the symptoms are impossible to ignore. This isn’t just an inconvenience; it’s a critical component for your vehicle’s performance and safety.
This replacement T42 Transmission Control Module, part number 24235732, is the definitive solution for your 2007-2009 Yukon TCM issues. We take the guesswork and extra cost out of the repair by pre-programming the module to your vehicle’s specific VIN. This means it arrives at your door ready for a true plug-and-play installation, eliminating the need for an expensive trip to the dealership for programming. It’s designed to restore the precise, smooth shifting and reliable performance you expect from your GM vehicle.
A Technician’s Notebook: The Limp Mode Yukon
A customer brought in his 2008 Yukon, explaining it felt like it was “stuck in mud.” The truck wouldn’t shift past 2nd gear—a classic case of limp mode. His dash was lit up with a check engine light, and my scan tool pulled a P0700 (Transmission Control System Malfunction). After checking the basics, my experience pointed straight to the TCM. These modules are notorious for internal electronic failures after years of heat cycles in the engine bay. Instead of a costly diagnostic and programming session at the dealer, we installed one of our VIN-programmed T42 modules. In less than an hour, the codes were cleared, the truck was shifting perfectly through all gears on the test drive, and the customer drove away with a reliable fix for a fraction of the dealership’s price.
Is Your Yukon Exhibiting These Telltale Signs?
A faulty TCM will give you clear warnings. If you’re experiencing any of the following, it’s highly likely your module is the culprit. Ignoring these can lead to more significant transmission damage down the road.
- ✔ Harsh, erratic, or delayed gear shifts that slam into place.
- ✔ Vehicle is stuck in a single gear (limp mode), often 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-specific codes.
- ✔ Complete failure to upshift or downshift, leading to poor acceleration.
- ✔ Noticeable decrease in fuel economy.
- ✔ Intermittent loss of communication with the module.
A Straightforward Guide to Installation
One of the best features of this part is its simple installation. You don’t need to be a master mechanic to get this job done. For most Yukon models, the entire process takes less than 30 minutes.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system’s memory.
- Locate the TCM: On your 2007-2009 Yukon, the TCM is typically found in the engine compartment, mounted next to the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Reconnect the electrical connectors, ensuring they click securely into position.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and use a basic OBD2 scan tool to clear any lingering fault codes from the previous module. Your Yukon is now ready for a test drive!
Verified Vehicle Compatibility List
This T42 TCM is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page focuses on the 2007-2009 Yukon TCM, it is also compatible with the following models. Please verify your specific application.
- GMC Yukon / Yukon XL 1500: 2007-2009
- GMC Sierra 1500 / 2500: 2007-2013
- GMC Savana 1500 / 2500 / 3500: 2006-2014
- GMC Envoy / Envoy XL: 2006-2009
- Chevrolet Tahoe / Suburban 1500: 2007-2009
- Chevrolet Silverado 1500 / 2500: 2007-2013
- Chevrolet Avalanche 1500: 2007-2008
- Chevrolet Express 1500 / 2500 / 3500: 2006-2014
- Chevrolet Trailblazer / Trailblazer EXT: 2006-2009
- And many more GM models including Cadillac, Buick, Pontiac, Saturn, Hummer, and Saab. This part interchanges with: 24252114, 24234503, 24230461, 24235732, and others.
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. This module comes fully pre-programmed to your vehicle’s VIN. It is ready for installation right out of the box, saving you time and money.
What is the warranty on this TCM?
This part is backed by our one-year, hassle-free warranty, giving you peace of mind with your purchase.
Is this a new or used part?
This is a high-quality, OEM-standard replacement part, tested to ensure reliability and longevity. It is not a used part pulled from a junkyard.
Where is the TCM located on my 2008 GMC Yukon?
On the 2007-2009 GMC Yukon, the Transmission Control Module is typically located in the engine bay, mounted right next to the battery.
Do I need to send my old part back?
No, there is no core charge for this module. You can keep or dispose of your old part at your convenience.