Fix Your Yukon’s Erratic Shifting for Good
If your 2007-2009 GMC Yukon is suffering from harsh shifting, getting stuck in gear, or throwing transmission-related check engine lights, a failing Transmission Control Module (TCM) is the most likely culprit. As a technician with over two decades of experience, I’ve seen these symptoms countless times. The TCM is the brain of your automatic transmission, and when it fails, it can make your reliable SUV feel unpredictable and unsafe. This T42 TCM, part number 24234274, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
From the Diagnostic Bay: The Case of the Hesitant Yukon
A customer brought in their ’08 Yukon complaining of a severe ‘bang’ when shifting from 1st to 2nd and occasional refusal to shift past 3rd gear. They had already replaced two shift solenoids at another shop with no success. A quick scan revealed a P0700 (Transmission Control System Malfunction) and an intermittent P0752 (Shift Solenoid A Stuck On). Instead of just throwing more parts at it, we checked the TCM’s command signals. We found the module was sending erratic voltage to the solenoid, causing the harsh engagement. Replacing the faulty original unit with a VIN-programmed 2007-2009 Yukon Transmission Control Module like this one resolved all shifting issues on the first test drive. It’s a classic example of how the controller, not always the mechanical part, is the root cause.
Is Your Yukon Exhibiting These Telltale Signs?
A failing TCM doesn’t get better on its own. Ignoring these symptoms can lead to more significant transmission damage. Here’s what to look for:
- ✔ Unpredictable, harsh, or delayed gear shifts.
- ✔ The vehicle enters “limp mode,” often stuck in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0752, or other solenoid-specific codes.
- ✔ A sudden drop in fuel economy.
- ✔ The transmission seems to slip out of gear or fails to engage entirely.
A Straightforward Guide to Installation
One of the biggest benefits of this module is its simple installation, which a confident DIYer can complete in under 30 minutes. For your 2007-2009 Yukon, the TCM is conveniently located in the engine bay, right next to the battery.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the system.
- Locate the Module: Find the TCM mounted next to the battery in your Yukon’s engine compartment.
- Disconnect and Remove: Carefully unclip the electrical connectors. Be gentle with the locking tabs. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock.
- Reconnect and Verify: Reconnect the negative battery terminal. Start the vehicle and allow it to idle for a few minutes. Take a short test drive to confirm that shifting is smooth and responsive. Any stored codes should be cleared.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page focuses on the 2007-2009 Yukon Transmission Control Module, it is also compatible with the following models. Please verify your part number (24234274) or one of the interchangeable numbers (e.g., 24252114, 24234503, 24242391) for a perfect match.
- Chevrolet Avalanche (2007-2008)
- Chevrolet Cobalt (2006-2010)
- Chevrolet Colorado (2008-2012)
- Chevrolet Express Vans (2006-2014)
- Chevrolet HHR (2006-2011)
- Chevrolet Impala (2006-2011)
- Chevrolet Malibu (2006-2010)
- Chevrolet Monte Carlo (2006-2007)
- Chevrolet Silverado 1500/2500 (2007-2013)
- Chevrolet SSR (2005-2006)
- Chevrolet Suburban 1500 (2007-2008)
- Chevrolet Tahoe (2007-2009)
- Chevrolet Trailblazer (2006-2009)
- GMC Canyon (2008-2012)
- GMC Envoy / XL (2006-2009)
- GMC Savana Vans (2006-2014)
- GMC Sierra 1500/2500 (2007-2013)
- GMC Yukon / XL 1500 (2007-2009)
- Buick Allure / LaCrosse (2006-2009)
- Buick Lucerne (2006-2011)
- Buick Rainier (2006-2007)
- Buick Rendezvous (2006-2007)
- Cadillac DTS (2006-2011)
- Hummer H3 (2008-2010)
- Pontiac G5 / G6 (2006-2010)
- Pontiac Grand Prix (2006-2008)
- Pontiac Pursuit (2006)
- Saab 9-7X (2006-2009)
- Saturn Aura (2007-2009)
- Saturn Ion (2006-2007)
- Saturn Vue (2007-2010)
Frequently Asked Questions
What does ‘VIN Programmed’ mean for me?
It means we load your vehicle’s unique Vehicle Identification Number (VIN) and the latest GM software onto the module before shipping. This ensures it communicates perfectly with your Yukon’s engine and other systems right out of the box, eliminating the need for an expensive trip to the dealership for programming.
Do I need any special tools for this installation?
No special tools are required. Basic hand tools, such as a socket set to remove the mounting bolts and disconnect the battery, are all you need. The entire process is designed to be straightforward for anyone with basic mechanical skills.
Is there a core charge for my old TCM?
No, there is no core charge. You are not required to send your old, faulty module back to us, saving you time and return shipping costs.
Will this fix a P0700 check engine light code?
Yes. A P0700 code is a general fault code indicating the TCM has detected a problem. In a vast majority of cases where the TCM itself is the faulty component, replacing it with this pre-programmed unit will resolve the P0700 code and any related transmission codes.
What kind of warranty is included?
This module is backed by our one-year, hassle-free warranty. We stand behind the quality and reliability of our parts, giving you peace of mind with your purchase.