Restore Smooth, Reliable Shifting to Your GMC Yukon
Is your 2007-2009 GMC Yukon suffering from harsh shifting, getting stuck in gear, or throwing transmission-related trouble codes? You’re not just dealing with an annoyance; you’re facing a common failure point: the Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless GM trucks and SUVs sidelined by these exact issues. A faulty TCM can make your vehicle unpredictable and unsafe. This replacement T42 TCM, part number 24240400, 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 mandatory trip to the dealership.
From the Diagnostic Bay: The Intermittent Shifting Nightmare
A customer brought in his ’08 Yukon XL, complaining of random, violent shifts and occasional ‘limp mode’ that would disappear after restarting the truck. He’d already spent money on a transmission fluid service elsewhere, with no improvement. My scan tool showed a history of solenoid circuit codes and a generic P0700 (Transmission Control System Malfunction). After checking the wiring harness for damage, my experience pointed straight to the TCM. These modules, often mounted in the engine bay, endure constant heat and vibration, which eventually causes internal circuits to fail. We installed one of our VIN-programmed modules, and the fix was immediate. The customer saved hundreds by avoiding dealership programming fees and got a reliable solution that addressed the root cause.
Is Your Yukon Exhibiting These Telltale Signs?
A failing TCM doesn’t heal itself; the symptoms only get worse. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Abrupt, jerky, or delayed gear changes.
- ✔ The transmission refuses to shift up or down, often getting stuck in 2nd or 3rd gear (limp mode).
- ✔ An illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-specific faults.
- ✔ A noticeable drop in fuel efficiency as the transmission operates incorrectly.
- ✔ Complete loss of communication with the transmission module.
Your Quick and Easy Installation Guide
One of the best features of this module is its straightforward installation, which most DIYers can complete in under 30 minutes with basic hand tools. This guide is specifically helpful for your 2007-2009 Yukon Transmission Control Module replacement.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the onboard systems.
- Locate the Module: On most 2007-2009 Yukon models, the TCM is conveniently located in the engine compartment, typically mounted 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 Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. While our programming handles the critical setup, it’s good practice to use a basic OBD-II scanner to clear any stored fault codes from the vehicle’s memory.
Verified Fitment For a Wide Range of GM Vehicles
While this is the perfect solution for your Yukon, this T42 TCM is also compatible with a vast array of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is a direct replacement for part numbers 24240400, 24252114, 24234503, and others listed in the interchange data.
Frequently Asked Questions
What does VIN programming mean for me?
It means the module arrives ready for installation. We load your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software onto the module before shipping. This ensures it communicates perfectly with your engine computer and other systems, eliminating the need for expensive dealership programming.
Do I need to take my vehicle to a dealer after installation?
No. Our VIN programming makes this a true plug-and-play part. Once installed, your vehicle will operate correctly without any further calibration or dealer intervention, saving you time and money.
Where is the TCM located on my 2007-2009 GMC Yukon?
On the 2007-2009 GMC Yukon, the Transmission Control Module is typically found in the engine bay, mounted on a bracket right next to the battery. Its location makes it easily accessible for a quick swap.
Will this fix a P0700 trouble code?
Yes, in many cases. The P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is the source of the malfunction, replacing it with our programmed unit will resolve the issue and allow the code to be cleared permanently.
Is there a core charge for my old part?
No, there is absolutely no core charge. You are not required to send your old, faulty module back to us, which simplifies the repair process for you.