Is Your GMC Yukon Shifting Erratically?
If you’re dealing with a 2007, 2008, or 2009 GMC Yukon that’s slamming into gear, refusing to shift, or has the check engine light glaring at you, the problem is very likely a failing Transmission Control Module (TCM). Over my 20+ years in the shop, I’ve seen hundreds of these GM trucks and SUVs come in with these exact symptoms. Just last week, a customer brought in his ’08 Yukon. It was stuck in third gearโwhat we call ‘limp mode’โand throwing a P0700 code. He was worried he needed a whole new transmission, but a quick scan confirmed our suspicion: the TCM was the culprit. This is a common failure point, but the fix is surprisingly straightforward.
The Direct Solution: A VIN-Programmed T42 TCM
Don’t let a faulty module sideline your vehicle. This OEM-quality T42 Transmission Control Module, corresponding to part number 24234503, is the definitive solution. The most critical feature is our pre-programming service. We flash the module with your Yukon’s specific Vehicle Identification Number (VIN) and the latest GM software before it even ships. This means it arrives at your door ready for a true plug-and-play installation, restoring the precise, smooth shifting you expect from your truck and saving you from a costly and time-consuming trip to the dealership for programming.
Expert Pro Tip: Check Your Connectors First
Before you install the new module, take a moment to inspect the wiring harness connectors that plug into the TCM. I’ve seen cases where moisture intrusion causes corrosion on the pins. This corrosion can create poor connections that mimic the symptoms of a failed module. Use a small brush and some quality electrical contact cleaner to ensure the pins are clean and bright. This simple five-minute check can prevent a misdiagnosis and ensure your new part works perfectly from the start.
Common Symptoms of a Failing 2007-2009 Yukon Transmission Control Module
If you’re experiencing any of the following, a faulty TCM is the most likely cause. This module directly resolves these issues:
- โ Harsh, jerky, or delayed gear shifts.
- โ Vehicle is stuck in one gear (limp mode).
- โ Check Engine Light or Transmission Warning Light is on.
- โ Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related codes are present.
- โ Failure to upshift or downshift properly.
- โ A sudden drop in fuel economy.
- โ Complete loss of communication with the transmission.
Plug-and-Play Installation: Get Back on the Road in Under 30 Minutes
You don’t need to be a master technician to replace this part. The TCM on your 2007-2009 Yukon is conveniently located in the engine bay, right next to the battery. Follow these simple steps:
- 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: Open the hood and find the TCM mounted next to the battery on the driver’s side.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed module into place. Securely reconnect the wiring harnesses, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While not always necessary, 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 restored performance!
This replacement 2007-2009 Yukon Transmission Control Module is built to meet or exceed original equipment specifications for a long-lasting, reliable repair. It’s also interchangeable with a wide range of part numbers, including 24252114, 24234274, and 24256960, making it a versatile solution for many GM vehicles. Order today and fix your transmission problems the right way.