Restore Crisp, Reliable Shifting to Your GMC Yukon
If your 2007-2009 GMC Yukon is suffering from delayed shifts, getting stuck in gear, or throwing transmission-related check engine lights, you’re likely dealing with a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can cause a host of frustrating and potentially damaging problems. This OEM-quality T42 TCM, part number 24235754, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair that gets you back on the road without a trip to the dealership.
Over my 20 years in diagnostics, I’ve seen countless GM trucks and SUVs come into the shop with what owners feared was a catastrophic transmission failure. More often than not, the culprit wasn’t the mechanical hardware but this very module. A failing 2007-2009 Yukon TCM can mimic the symptoms of a bad transmission, but replacing it is a fraction of the cost and effort. Our VIN programming service ensures the module communicates flawlessly with your vehicle’s engine computer and other systems right out of the box, restoring the smooth, predictable performance you expect.
Case Study: A Tricky Diagnosis
A customer brought in his ’08 Yukon XL, complaining of intermittent harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode), especially on hot days. He’d already replaced a shift solenoid with no luck. We scanned it and found a generic P0700 code. Instead of just throwing more parts at it, we monitored the TCM data stream. We noticed the command signals from the TCM were dropping out randomly. This pointed directly to an internal failure in the module, likely due to heat and vibration over the years. We installed one of our VIN-programmed TCMs, and the problem was solved instantly. It’s a classic example of how the 2007-2009 Yukon TCM is often the root cause of confusing transmission behavior.
Is Your Yukon Exhibiting These Telltale Signs?
- ✔ Unpredictable or harsh gear changes.
- ✔ The vehicle feels like it’s 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 (Transmission Control System Malfunction), P0750, or other solenoid-specific codes.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable decrease in fuel economy.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Installation
One of the best parts about this solution is its simplicity. You don’t need to be a master mechanic to get this job done in your own driveway in less than half an hour.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: On most 2007-2009 Yukon models, the TCM is conveniently located in the engine compartment, typically right next to the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount your new, VIN-programmed TCM onto the bracket and securely plug in the electrical connectors. You’ll hear a click when they’re properly seated.
- Reconnect and Verify: Reconnect the battery terminal. Start the vehicle and ensure all warning lights are off and the transmission shifts smoothly through all gears. While not always necessary, using a basic scan tool to clear any stored codes is good practice.
Verified Fitment for Your General Motors Vehicle
This T42 TCM is a direct replacement for part number 24235754 and is interchangeable with many other service numbers. It is engineered to work with a wide array of GM vehicles equipped with 4-speed automatic transmissions (like the 4L60E, 4L65E, and 4L70E). While this page is focused on the 2007-2009 Yukon TCM, this part also fits:
- GMC: Sierra 1500/2500, Savana, Envoy
- Chevrolet: Silverado 1500/2500, Tahoe, Suburban, Avalanche, Express, Impala, Cobalt, HHR
- Cadillac: DTS
- Buick: LaCrosse, Lucerne, Rainier
- Pontiac: G6, Grand Prix
- And many more models from Saturn, Hummer, and Saab. Please verify your specific model and year in the fitment chart.
Why is VIN programming so important for a TCM?
Why is VIN programming so important for a TCM?
VIN programming loads your vehicle’s specific software and calibrations onto the module. This ensures it communicates correctly with the engine, brakes, and other systems. Without it, the transmission may not shift correctly, or the vehicle may not start at all. Our pre-programming service saves you a costly and time-consuming trip to the dealership.
Is this a difficult part to replace myself?
No, this is a great DIY-friendly repair. The TCM is usually located in an easy-to-access spot in the engine bay, requiring only basic hand tools. The entire process typically 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. While this module replacement often resolves the root cause that triggered the P0700, it’s always wise to check for other specific codes (like solenoid or sensor codes) to confirm the diagnosis.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep your old module or dispose of it, making the process hassle-free.