If your 2007-2009 GMC Yukon is suffering from harsh shifting, getting stuck in gear, or has the dreaded check engine light on with transmission codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless GM trucks and SUVs sidelined by a faulty Transmission Control Module (TCM). The T42 module is the brain of your 4L60E or 4L65E transmission, and when it fails, it can cause a host of frustrating and debilitating problems. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded.
This is a direct-fit, OEM-quality T42 Transmission Control Module, a reliable solution for part number 24230461. The most significant benefit we offer is our expert VIN programming service. Before this module ships, we flash it with the latest GM software calibrated specifically to your Yukon’s VIN. This means it arrives at your door ready for a true plug-and-play installation, eliminating the need for an expensive trip to the dealership for programming. You can restore your vehicle’s smooth shifting performance right in your own driveway.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Yukon XL that was intermittently going into ‘limp mode,’ stuck in 3rd gear. He had already spent money replacing a shift solenoid based on a code, but the problem persisted. After connecting my scan tool, I saw the classic P0700 (Transmission Control System Malfunction) and an intermittent solenoid circuit code. Experience told me the issue wasn’t the solenoid itself, but the module commanding it. Heat soak was causing internal circuits in the original TCM to fail. We installed one of our pre-programmed T42 modules, and the problem was solved permanently. The customer was back on the road with confidence, having avoided further incorrect repairs.
Is Your Yukon’s TCM Failing? Watch for These Signs
A failing 2007-2009 Yukon TCM can manifest in several ways. If you’re noticing any of the following, it’s highly likely your module is the culprit:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in one gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758, or other solenoid-related faults.
- ✔ Failure to upshift or downshift properly as you accelerate or decelerate.
- ✔ A noticeable decrease in fuel economy due to inefficient shifting.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Installation
One of the best parts about this solution is its simplicity. For most DIYers or professional mechanics, this is a quick job that gets your vehicle running right without complex procedures.
- Safety First: Before you begin, disconnect the negative terminal from your vehicle’s battery. This prevents any electrical shorts and helps reset the vehicle’s electronic systems.
- Locate the TCM: On your GMC Yukon, the TCM is typically found in the engine bay, mounted next to the battery. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses connected to the old module. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Final Steps: Reconnect the negative battery terminal. While our programming handles the critical setup, it’s always a good practice to use a basic OBD2 scan tool to clear any stored fault codes from the ECU. Start the vehicle and enjoy restored shifting performance.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions. While this page focuses on the 2007-2009 Yukon TCM, it is also compatible with the following models. Please verify the location described matches your vehicle.
- GMC Yukon / Yukon XL 1500 (2007-2009): Transmission Control, (next to battery)
- Chevrolet Tahoe / Suburban 1500 (2007-2009): Transmission Control, (next to battery)
- Chevrolet Silverado 1500 (2007-2013): Transmission Control, (next to battery, non-hybrid)
- GMC Sierra 1500 (2007-2013): Transmission Control, (next to battery, non-hybrid)
- Chevrolet Avalanche 1500 (2007-2008): Transmission Control, (next to battery)
- Cadillac DTS (2006-2011): Transmission Control, (RH front engine compartment)
- Buick Lucerne (2006-2011): Transmission Control, (LH engine compartment)
- Chevrolet Impala (2006-2011): Transmission Control, (lower air cleaner housing)
- Hummer H3 (2008-2010): Transmission Control, (RH rear engine compartment)
- …and many other GM cars, trucks, and vans from 2006-2014. This part interchanges with 24252114, 24234503, 24230461, 24242391, and more.
Frequently Asked Questions
Do I need to do any programming myself?
No. This module comes fully pre-programmed to your vehicle’s specific VIN. It is ready for installation right out of the box, with no need for a scan tool or dealership visit for programming.
Is this a brand new part?
This is a high-quality, OEM-standard component that has been expertly inspected and prepared with fresh VIN programming to ensure reliability and performance that meets or exceeds the original factory part.
What is the warranty on this TCM?
We stand behind our work. This transmission control module is backed by a one-year warranty, giving you peace of mind with your purchase.
Will this fix a P0700 code?
A P0700 code is a general fault request from the TCM to the main engine computer. In many cases, a faulty TCM is the root cause, and replacing it will resolve the P0700 code and any other related transmission codes.
Do I need to send my old part back?
No, there is no core charge for this module. You can keep your old part, which saves you the time and hassle of a return shipment.