If your 2007-2009 GMC Yukon is suffering from delayed shifts, getting stuck in gear, or throwing transmission codes, you’re not just dealing with an annoyance—you’re facing a potential breakdown. The Transmission Control Module (TCM) is the brain of your automatic transmission, and when it fails, it can bring your entire vehicle to a halt. This T42 series TCM, part number 24241806, is the definitive solution, arriving expertly programmed to your vehicle’s VIN for a true plug-and-play repair.
As a technician with over two decades of experience, I’ve seen firsthand how a failing TCM can mimic a host of other expensive problems. Drivers often spend hundreds on fluid flushes or solenoid replacements, only to find the core issue was electronic. This module eliminates the guesswork. By controlling everything from shift points to torque converter lockup, a healthy TCM is critical for the performance and longevity of transmissions like the 4L60E, 4L65E, and 4L70E found in your Yukon.
A Technician’s Notebook: The Intermittent Gremlin
A customer brought in his ’08 Sierra with a classic complaint: “Sometimes it just won’t shift out of second gear.” Of course, it behaved perfectly on my test drive. We checked for codes—nothing active, but history showed a P0700 (Transmission Control System Malfunction). After checking the fluid and wiring harness for obvious damage, experience pointed me toward the TCM. These modules, especially the T42s, are known for developing internal faults from heat cycles and vibration. We swapped in a VIN-programmed module, and the problem vanished. The customer called a month later to say his truck had never shifted better. This isn’t just a part; it’s a permanent fix for those frustrating, intermittent electronic issues.
Is Your Yukon Exhibiting These Telltale Signs?
- ✔ Harsh, slamming shifts or erratic gear changes that make driving uncomfortable.
- ✔ The vehicle enters “limp mode,” often stuck in 2nd or 3rd gear, with significantly reduced power.
- ✔ Your Check Engine Light or a dedicated transmission warning light is illuminated on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as the generic P0700 or specific solenoid codes (e.g., P0751, P0756).
- ✔ A noticeable drop in fuel economy as the transmission fails to operate efficiently.
- ✔ Complete failure to shift, either up or down, or delayed engagement when shifting from Park to Drive.
A Straightforward Guide to Installation
This repair is well within the reach of a DIY enthusiast and can be completed in under 30 minutes with basic hand tools.
- Safety First: Before you begin, disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Locate the TCM: On most 2007-2009 Yukon models, the TCM is conveniently located in the engine bay, typically next to the battery. Consult your vehicle’s service manual if you have trouble finding it.
- Disconnect and Remove: Carefully unplug the electrical connectors from 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 connectors. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the engine and enjoy smooth, reliable shifting.
Verified Vehicle Compatibility
This T42 TCM is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions. While this listing is for the 2007-2009 Yukon TCM, it is also compatible with numerous other models. This unit interchanges with part numbers including 24252114, 24234503, 24240400, and more, ensuring broad application for your repair needs.
Fitment includes, but is not limited to:
- GMC Yukon, Yukon XL, Sierra
- Chevrolet Tahoe, Suburban, Silverado, Avalanche
- Cadillac DTS, Escalade
- Hummer H3
- And many other GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean for me?
It means this module arrives ready for installation right out of the box. We flash it with the latest GM software specific to your vehicle’s Vehicle Identification Number (VIN). This ensures perfect communication with your engine computer and other systems, 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. A basic socket set to remove the mounting bolts and potentially a small flathead screwdriver to help release the connector tabs are all you should need. The entire process typically takes less than 30 minutes.
Will this fix a P0700 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 code. However, P0700 can also be triggered by other transmission issues. If the module is the source of the fault, this part will be the solution.
Is there a core charge for my old part?
No, there is no core charge. You are not required to send your old, faulty module back to us, which simplifies the process and saves you money on shipping.
What kind of warranty is included?
This module is backed by our one-year, hassle-free warranty, giving you confidence and peace of mind in your repair.