Restore Flawless Shifting to Your GMC Yukon
If your 2007-2009 GMC Yukon is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, the culprit is often a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen how a faulty TCM can make a reliable truck feel unpredictable and unsafe. This T42 Transmission Control Module, part number 24235753, is the definitive, hassle-free solution. It arrives pre-programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership programming and getting you back on the road with confidence.
From the Diagnostic Bay: The Intermittent Shifting Mystery
A customer brought in his ’08 Yukon with a frustrating problem: most of the time it drove perfectly, but once or twice a week, it would slam into gear or refuse to shift out of 2nd. There were no consistent codes, just a general transmission fault (P0700) that would pop up and disappear. After checking the fluid, wiring, and solenoids, everything looked fine. This is a classic symptom of a TCM failing internally due to heat and vibration. The internal connections become unstable. We installed a VIN-programmed TCM, and the problem was solved permanently. This module prevents that diagnostic headache by providing a reliable, pre-configured component from the start.
Is Your Yukon Showing These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission failure. Often, the signs are electronic. Watch out for these common symptoms before the problem gets worse:
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ The vehicle enters “limp mode,” often stuck in 2nd or 3rd gear.
- ✔ An illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults.
- ✔ Inability to upshift or downshift, leading to poor acceleration and fuel economy.
- ✔ The transmission seems to slip between gears or struggles to engage from park.
Get Back on the Road: Your 30-Minute Installation Guide
Replacing the TCM on your Yukon is a straightforward job that most DIYers can handle with basic tools. Our VIN programming makes it a true plug-and-play process. For the 2007-2009 Yukon TCM, it’s typically located right next to the battery.
- 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: Find the TCM in the engine bay. On most GMT900 trucks like the Yukon, it’s mounted in a bracket next to the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new module in the bracket and securely plug in the electrical connectors until they click.
- Final Steps: Reconnect the battery terminal. While the system may reset, it’s best practice to use a basic OBD2 scan tool to clear any stored transmission codes. Start the vehicle and enjoy your smooth-shifting transmission!
Verified Fitment for Your General Motors Vehicle
This T42 TCM is a direct replacement for part number 24235753 and is compatible with a wide range of GM vehicles equipped with 4-speed automatic transmissions (4L60E, 4L65E, 4L70E). Please verify your model and location below:
- GMC Yukon / Yukon XL 1500 (2007-2009): Located next to the battery.
- Chevrolet Tahoe / Suburban 1500 (2007-2009): Located next to the battery.
- Chevrolet Silverado / GMC Sierra 1500 (2007-2013): Located next to the battery (for non-hybrid models).
- Chevrolet Express / GMC Savana Vans (2006-2014): Located in the RH engine compartment.
- Cadillac DTS (2006-2011): Located in the RH front engine compartment.
- Hummer H3 (2008-2010): Located in the RH rear engine compartment.
- Chevrolet Impala / Monte Carlo (2006-2011): Located under the lower air cleaner housing.
- …and many other Buick, Pontiac, and Saturn models.
Frequently Asked Questions
Why is VIN programming so important for this part?
VIN programming loads your vehicle’s specific software and calibrations onto the module before it ships. This ensures the TCM communicates correctly with your engine and transmission for optimal shift points, torque converter lockup, and fuel efficiency. It eliminates the need for a dealership visit, saving you hundreds of dollars.
Is this a difficult part for a DIYer to install?
Not at all. For most trucks like the Yukon, it’s one of the easier electronic components to replace. It’s located in an accessible spot in the engine bay and requires only basic hand tools. The entire process typically takes less than 30 minutes.
Will this fix a P0700 transmission code?
A P0700 code is a general fault code, meaning the TCM has detected a problem and requested the Check Engine Light. Often, if the TCM itself is faulty, replacing it will resolve the root cause of the P0700 and any related specific codes (like for solenoids). It’s a very common fix for this code.
Do I need to send my old part back (core charge)?
No, there is no core charge for this module. You can keep your old part or dispose of it without the hassle of returning it.
What kind of warranty is included?
This module comes with a one-year warranty, giving you peace of mind that you’re investing in a quality, reliable part for your vehicle.