Is your 2007-2009 GMC Yukon experiencing erratic shifting, getting stuck in gear, or displaying a check engine light related to the transmission?
A failing Transmission Control Module (TCM) is a common cause of these frustrating and potentially damaging issues. The TCM is the electronic brain of your Yukon’s automatic transmission, responsible for managing shift points, torque converter lockup, and fluid pressure. When it malfunctions, it can disrupt your entire driving experience, leading to poor performance, decreased fuel economy, and even leave you stuck in limp mode.
This OEM-quality T42 Transmission Control Module, part number 24238856, is the definitive solution to restore your vehicle’s factory performance. Each module is expertly programmed to your vehicle’s specific VIN, ensuring it arrives ready for a seamless, plug-and-play installation. This critical programming step loads the latest GM software updates, guaranteeing perfect communication between the module and your vehicle’s powertrain, without requiring an expensive trip to the dealership for additional setup.
Common Symptoms of a Failing Yukon TCM
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle gets stuck in a single gear (often called “limp mode”) to prevent further damage.
- ✔ An illuminated Check Engine Light or Transmission Warning Light on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults.
- ✔ Inability to upshift or downshift properly, leading to high RPMs or sluggish acceleration.
- ✔ A noticeable decrease in fuel efficiency as the transmission operates inefficiently.
- ✔ Complete loss of communication with the module, resulting in transmission failure.
From the Diagnostic Bay
We recently had a 2008 Yukon in the shop with classic symptoms of a bad shift solenoid—harsh 1-2 shift and a P0752 code. The owner had already replaced the solenoid twice with no luck. After a quick scan, we noticed intermittent communication drops with the TCM. The root cause wasn’t the solenoid at all; it was a failing driver circuit inside the original TCM. Installing a properly programmed T42 module solved the problem instantly. Always consider the TCM when you see recurring solenoid codes; it can save you hundreds in unnecessary parts and labor.
The Definitive Solution for Your 2007-2009 Yukon TCM
Don’t settle for a generic or used module that could fail prematurely or cause compatibility issues. Our T42 TCM is built to meet or exceed original equipment standards for reliability and longevity. The crucial benefit is our VIN programming service, which sets this part apart.
- Plug-and-Play Installation: Because we program the module to your specific VIN before shipping, it’s ready to install right out of the box. Simply connect it, and your Yukon’s computer will recognize it instantly.
- Restored Performance: With the latest software and precise calibration for your vehicle, you’ll experience smoother shifts, improved fuel economy, and the responsive performance you expect from your truck.
- Long-Term Reliability: This module is constructed with high-quality components to withstand the heat and vibration of the engine bay, ensuring a lasting repair. It’s backed by a one-year warranty for your peace of mind.
Straightforward Installation
Replacing the 2007-2009 Yukon TCM is a job most DIYers can handle in under 30 minutes. In most Yukon, Tahoe, and Sierra models of this era, the module is conveniently located in the engine compartment, typically next to the battery. Simply disconnect the vehicle’s battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. After reconnecting the battery, use a standard OBD2 scan tool to clear any stored transmission codes. No core charge means you can keep your old part without any hassle.
Wide-Ranging GM Vehicle Compatibility
This T42 TCM is a direct replacement for a wide array of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with numerous part numbers, including 24252114, 24234503, 24230461, 24238856, and more, making it a versatile solution for models like the Chevrolet Silverado, Tahoe, Suburban, Impala; GMC Sierra, Savana; Cadillac DTS; and many others from 2006 to 2014.
Frequently Asked Questions
What does VIN programming mean for me?
VIN programming means we load your vehicle’s unique identification number and corresponding factory software onto the module before we ship it. This ensures it works perfectly with your Yukon’s specific engine, transmission, and options, eliminating the need for a dealership to program it.
Can I install this TCM myself?
Yes, this is a very straightforward installation for anyone with basic mechanical skills. The module is easily accessible in the engine bay, and the process typically involves disconnecting the battery, swapping the module, and reconnecting everything. No special tools are required.
Will this module fix specific transmission codes like P0700?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause of a P0700 and related solenoid codes (like P0750-P0758), you should ensure other components like wiring and solenoids are in good condition. A faulty TCM is a very common cause for these codes.
Is there a core charge for my old part?
No, there is no core charge or need to return your old, faulty module. You can dispose of it at your convenience, making the process simpler and hassle-free.
How is this different from a used module from a junkyard?
A used module will be programmed to the donor vehicle and will not work correctly in yours without being reprogrammed. It also comes with an unknown history and no warranty. Our module is a quality-tested unit, programmed specifically for your Yukon with the latest software, and includes a one-year warranty.