Restore Peak Transmission Performance in Your GMC Yukon
Is your 2007, 2008, or 2009 GMC Yukon suffering from frustrating and unpredictable transmission behavior? Issues like harsh shifting, delayed gear engagement, or getting stuck in limp mode are often not signs of a catastrophic mechanical failure, but rather a faulty Transmission Control Module (TCM). This critical electronic component is the brain of your automatic transmission, and when it fails, it can make your reliable SUV feel unsafe and unpredictable. This T42 TCM, service part number 24243901, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a seamless, plug-and-play installation.
Diagnosing Your 2007-2009 Yukon TCM Failure
The TCM in your Yukon manages everything from shift points and line pressure to torque converter lockup. Over time, heat, vibration, and electrical fluctuations can degrade internal components, leading to a host of performance problems. Before condemning the entire transmission, which can be a costly and time-consuming repair, it’s essential to evaluate the TCM. A failing module will often trigger specific diagnostic trouble codes (DTCs) and exhibit noticeable symptoms during operation. Replacing a faulty TCM can restore the smooth, responsive shifting you expect from your vehicle.
From the Diagnostic Bay
We recently had a 2008 Yukon in the shop that the owner was convinced needed a full transmission rebuild. It was slamming into gear and occasionally wouldn’t shift past 2nd. The codes were pointing towards multiple solenoid failures (P0750, P0755). While it’s possible for multiple solenoids to fail, it’s highly improbable they all go at once. We checked the wiring harness for damage and found nothing. On a hunch, we swapped in a known-good, programmed T42 TCM. Instantly, all the shifting problems vanished. The original module had internal circuit failures that were sending erratic signals, mimicking a mechanical issue. This saved the customer thousands of dollars and got their Yukon back on the road the same day.
Common Symptoms of a Failing GM T42 Module
- ✔ Unpredictable or harsh gear changes, both upshifting and downshifting.
- ✔ The vehicle gets stuck in a single gear, often referred to as “limp mode,” to prevent further damage.
- ✔ Illumination of the Check Engine Light or a dedicated transmission warning light on your dashboard.
- ✔ Your scan tool reads transmission-specific DTCs, such as P0700 (Transmission Control System Malfunction) or various solenoid circuit codes.
- ✔ A noticeable delay when shifting from Park into Drive or Reverse.
- ✔ A significant drop in fuel economy as the transmission operates inefficiently.
- ✔ Complete loss of communication with the transmission module, preventing diagnostics.
The VIN-Programmed Advantage
This isn’t just a generic part off the shelf. We take the hassle and expense out of the repair process. When you order, you provide your vehicle’s VIN, and we program the module with the latest GM-certified software specific to your Yukon’s configuration. This ensures perfect communication between the engine and transmission, optimal shift strategies, and correct operation from the moment it’s installed. You bypass the need for an expensive trip to the dealership for programming, making this a true DIY-friendly solution.
This module 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 part numbers, including 24252114, 24234503, 24230461, and 24243901, ensuring broad compatibility for your repair needs.
Installation is straightforward. In most 2007-2009 Yukon models, the TCM is located in the engine bay, 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. Reconnect everything, and you’re ready to go. We recommend clearing any stored DTCs with a scan tool after installation for a clean slate. With no core charge, you don’t have to worry about the cost or logistics of sending your old part back.
Take control of your vehicle’s performance and reliability. Order your pre-programmed 2007-2009 Yukon TCM today and get back to driving with confidence.
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. This Transmission Control Module comes pre-programmed to your vehicle’s specific VIN. This ensures it works correctly right out of the box without any need for additional dealership tools or programming fees.
Where is the TCM located on my 2008 GMC Yukon?
On most 2007-2009 GMC Yukon, Tahoe, and Silverado models, the T42 TCM is found in the engine compartment, mounted next to the battery. Always confirm the location on your specific vehicle before beginning the installation.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a faulty TCM itself can cause this code, it often appears alongside other, more specific codes. This module will resolve the issue if the TCM is the root cause of the fault codes being stored.
Is this a genuine OEM part?
This is an OEM-quality part built to meet or exceed original equipment specifications. It is programmed using official GM software and is designed to provide lasting and reliable performance.
What is the warranty on this part?
This part comes with a one-year warranty, giving you peace of mind and protection against any potential defects in materials or workmanship.