Is your 2007-2009 GMC Yukon suffering from frustrating and unpredictable transmission issues? As a technician with over two decades of experience, I’ve seen firsthand how a failing Transmission Control Module (TCM) can turn a reliable SUV into a source of daily stress. Hard slams into gear, getting stuck in limp mode, or a persistent Check Engine Light are more than just annoyances—they’re signs that the brain of your transmission is failing. This T42 series TCM, part number 24252114, is the definitive solution, arriving expertly programmed to your vehicle’s VIN for a true plug-and-play repair.
A Technician’s Notebook
I remember a customer with a 2008 Yukon who was about to spend thousands on a transmission rebuild. His truck was shifting harshly and would intermittently refuse to shift past 2nd gear. He’d been told the clutches were shot. I hooked up my scan tool and saw no signs of major mechanical failure, but I did see erratic data from the TCM and a history of solenoid circuit codes. We swapped in one of these pre-programmed modules right in the parking lot. In less than 30 minutes, the truck was shifting like it just rolled off the factory floor. It saved him a massive repair bill and reinforced a key diagnostic lesson: always check the electronics first.
Is Your Yukon Exhibiting These Telltale Signs?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution for your 2007-2009 Yukon TCM problems:
- ✔ Abrupt, harsh, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle enters a ‘limp mode,’ often getting stuck in 2nd or 3rd gear.
- ✔ An illuminated Check Engine Light or Transmission Warning Light on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700 (Transmission Control System Malfunction), P0750-series solenoid codes, or communication errors.
- ✔ A sudden drop in fuel efficiency or signs of the transmission overheating.
- ✔ Complete loss of gear engagement or intermittent communication failure.
Your 30-Minute Path to a Smooth Ride
One of the biggest advantages of this module is its straightforward installation. You don’t need a lift or specialized transmission tools. For most GMT900 platform trucks like your Yukon, the process is simple:
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On your Yukon, the TCM is typically found in the engine bay, mounted next to the battery. It’s a silver box with large electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses. They have locking tabs that need to be released. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Bolt the new, pre-programmed module into place and securely reconnect the electrical harnesses. You’ll hear a ‘click’ when they are properly seated.
- Final Steps: Reconnect the battery terminal. While our programming handles the critical setup, it’s always good practice to use a basic OBD2 scanner to clear any stored fault codes from the vehicle’s memory.
Verified Fitment for Your GM Vehicle
This T42 TCM is a direct replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page is focused on the 2007-2009 Yukon TCM, it also fits many other models. Please verify your part number or consult the list below:
Fits Select Models Including:
- GMC Yukon / Yukon XL: 2007-2009
- Chevrolet Tahoe / Suburban / Avalanche: 2007-2008
- GMC Sierra & Chevrolet Silverado 1500/2500: 2007-2013 (varies by engine/options)
- GMC Savana & Chevrolet Express Vans: 2006-2014
- Cadillac DTS, Buick Lucerne, Chevrolet Impala: and many more.
This module is interchangeable with part numbers: 24252114, 24242391, 24234503, 24230461, 24234274, 24235340, and others.
Frequently Asked Questions
Do I need to take my vehicle to the dealership for programming?
No. This module comes fully pre-programmed to your vehicle’s specific VIN. This is a plug-and-play solution that saves you the time, cost, and hassle of a dealer visit.
What tools are required for installation?
Basic hand tools are all that’s needed. Typically, a simple socket set to remove the mounting bolts and a flathead screwdriver to help release the connector clips are sufficient. The entire job usually takes less than 30 minutes.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, a failing TCM is the root cause, and replacing it will resolve the issue. However, you should always check for other specific codes (like solenoid or sensor codes) to confirm the diagnosis.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module without any extra fees or the need to ship it back to us.
What kind of warranty is included?
This part is backed by our one-year warranty, giving you peace of mind and confidence in your repair. We stand by the quality and reliability of our programmed electronics.