Restore Your Yukon’s Shifting Performance
If you’re dealing with the frustration of a GMC Yukon that bangs into gear, refuses to shift, or is stuck in limp mode, you’re not alone. Over my 20 years in the garage, I’ve seen countless GM trucks and SUVs sidelined by a faulty Transmission Control Module (TCM). The TCM is the brain of your automatic transmission, and when it fails, it can cause a cascade of problems that make your vehicle unreliable and unsafe to drive. This T42 Transmission Control Module, part number 24230461, is the definitive solution, arriving pre-programmed to your vehicle’s VIN for a true plug-and-play fix.
From the Diagnostic Bay
I remember a 2008 Yukon that came into my shop with the classic complaint: “It shifts fine when it’s cold, but after 20 minutes of driving, it starts slamming into gear and the check engine light comes on.” The owner had already replaced two shift solenoids with no luck. A quick scan showed a P0752 (Shift Solenoid A Stuck On) code, but my experience pointed elsewhere. We tested the TCM’s command signals and found they were dropping out when the module got hot. Instead of a costly internal transmission repair, the fix was this simple external module. Installing a pre-programmed 2007-2009 Yukon TCM had the customer back on the road in under an hour, with shifting smoother than ever.
Is Your Yukon Exhibiting These Transmission Problems?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. Don’t let a small electronic part lead to a major transmission failure.
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ Vehicle is stuck in a single gear (often called “limp mode”) and won’t upshift or downshift.
- ✔ The Check Engine Light or Transmission Warning Light is illuminated on your dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as the general P0700 or specific solenoid codes like P0750, P0751, P0752, etc.
- ✔ A noticeable decrease in fuel economy as the transmission operates inefficiently.
- ✔ Complete loss of communication with the TCM, leading to a no-start or no-shift condition.
A Straightforward Guide to Your TCM Replacement
One of the best features of this module is how simple it is to install. You don’t need specialized tools or a trip to the dealership. For most Yukon and similar GM models, you can complete the job in your driveway in about 30 minutes.
- Safety First: Begin by disconnecting the negative terminal on your vehicle’s battery. This prevents any electrical shorts and helps reset the vehicle’s computer systems.
- Locate the Module: On your 2007-2009 Yukon, the TCM is typically located in the engine bay, right next to the battery. On other GM vehicles, it might be on the LH strut tower or under the air cleaner box. It’s a silver box with several large electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed TCM into place. Securely plug in the electrical connectors, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and let it idle for a few minutes. If you have a basic OBD2 scanner, it’s a good practice to clear any stored fault codes. Take the vehicle for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility
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. It is interchangeable with part numbers 24252114, 24234503, 24230461, and more. Please verify your model and options below:
- GMC Yukon / Yukon XL 1500 (2007-2009): Located next to battery.
- Chevrolet Tahoe / Suburban 1500 (2007-2009): Located next to battery.
- Chevrolet Silverado / GMC Sierra 1500 (2007-2013): Located next to battery (for non-hybrid models).
- Chevrolet Avalanche 1500 (2007-2008): Located next to battery.
- Cadillac DTS (2006-2011): Located in RH front engine compartment.
- Buick Lucerne (2006-2011): Located in LH engine compartment.
- Chevrolet Impala (2006-2011): Located under lower air cleaner housing.
- Hummer H3 (2008-2010): Located in RH rear engine compartment.
- Chevrolet Colorado / GMC Canyon (2008-2012): Located in RH rear engine compartment.
- …and many more GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions About the 2007-2009 Yukon TCM
Frequently Asked Questions
Do I need to take my truck to the dealer for programming?
No. This module is delivered pre-programmed to your vehicle’s specific VIN. It’s ready for installation right out of the box, saving you hundreds in dealership fees.
Is this part difficult to install for a DIYer?
Not at all. The installation is very straightforward, typically requiring only basic hand tools to unbolt the old module and install the new one. Most customers complete the job in under 30 minutes.
What is the warranty on this TCM?
This module comes with a one-year warranty, giving you peace of mind that you’re buying a quality, reliable part for your vehicle.
Will this fix a P0700 trouble code?
Yes. A P0700 code is a general transmission fault request. In many cases, a failing TCM is the root cause that triggers this code. Replacing the module with this programmed unit will resolve the underlying issue.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module without the hassle of needing to return it.