Is Your GMC Yukon Shifting Erratically?
If you’re dealing with harsh shifting, delayed gear engagement, or a check engine light that points to transmission trouble in your 2007, 2008, or 2009 GMC Yukon, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change with precision. When it fails, it can lead to a frustrating and potentially unsafe driving experience, including being stuck in ‘limp mode.’ This direct-replacement T42 TCM, part number 24235754, is the definitive solution to restore your vehicle’s factory performance and drivability.
From the Diagnostic Bay
We had a 2008 Yukon come into the shop with classic symptoms: banging into gear and a P0700 code. The owner had already replaced two shift solenoids based on a generic code reader’s advice, with no improvement. We knew from experience that on these GM platforms, the internal electronics of the T42 module often fail, causing erratic signals to perfectly good solenoids. Instead of chasing ghosts, we installed one of our VIN-programmed TCMs. The installation took less than 30 minutes. After a quick battery disconnect to clear the adaptive memory and a test drive, the Yukon was shifting like it just rolled off the assembly line. The customer saved hundreds by avoiding unnecessary internal transmission work.
Diagnosing a Faulty 2007-2009 Yukon TCM
A failing TCM doesn’t just degrade performance; it can mimic more severe mechanical transmission problems. Before considering a costly transmission rebuild, it’s crucial to evaluate the TCM. Our pre-programmed 2007-2009 Yukon TCM is engineered to resolve these issues directly, arriving at your door ready for a plug-and-play installation without any need for expensive dealership programming.
Common Symptoms of TCM Failure
- ✔️ Harsh Shifting: Abrupt, jerky, or banging gear changes, both upshifting and downshifting.
- ✔️ Limp Mode Activation: The vehicle gets stuck in a single gear (usually 2nd or 3rd) to prevent further damage.
- ✔️ Warning Lights: Illumination of the Check Engine Light or a specific transmission warning light on your dashboard.
- ✔️ Diagnostic Trouble Codes (DTCs): Common codes include P0700 (Transmission Control System Malfunction), P0750-series (Shift Solenoid Malfunction), and other transmission-related faults.
- ✔️ Delayed Engagement: A noticeable pause when shifting from Park into Drive or Reverse.
- ✔️ Poor Fuel Economy: Inefficient shifting patterns cause the engine to work harder, consuming more fuel.
- ✔️ No Communication: A scan tool may be unable to communicate with the transmission module, indicating a complete failure.
The Plug-and-Play Advantage
The single biggest hurdle in replacing a modern electronic module is programming. This module eliminates that problem entirely. We use your vehicle’s Vehicle Identification Number (VIN) to load the latest GM-certified software and calibrations directly onto the module before it ships. This ensures it communicates perfectly with your Yukon’s Engine Control Module (ECM) and other systems right out of the box. Simply install it, connect the harnesses, and you’re ready to go.
Broad Compatibility Beyond the Yukon
While this is the perfect fit for your 2007-2009 Yukon, this T42 TCM is also compatible with a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It serves as a direct replacement for numerous part numbers, including 24242391, 24234503, 24252114, and many more, making it a versatile solution for models like the Chevrolet Silverado, Tahoe, GMC Sierra, Cadillac DTS, and Buick Lucerne from roughly 2006 to 2014.
Simple Installation
For most GMT900 trucks and SUVs like the Yukon, the TCM is conveniently located in the engine bay, typically next to the battery. The replacement process is straightforward for a DIY mechanic with basic tools and can be completed in under an hour.
1. Disconnect the negative battery terminal.
<2. Locate the TCM and disconnect the electrical connectors.
3. Unbolt the module from its bracket.
4. Install the new module, reconnect the connectors, and re-attach the battery terminal.
5. Start the vehicle and allow it to idle for a few minutes to complete the relearn process. It’s recommended to clear any stored codes with a scan tool after installation.
Frequently Asked Questions
Will this TCM fit my 2007 GMC Yukon?
Yes, this module is a direct-fit replacement for the 2007, 2008, and 2009 GMC Yukon. It is pre-programmed to your specific vehicle’s VIN for guaranteed compatibility and performance.
Do I need to take my vehicle to the dealer for programming?
No. This is the key benefit of our module. We handle all the programming before shipping. This is a true plug-and-play solution, saving you the time and expense of a dealership visit.
What is the difference between a TCM and an ECM?
The ECM (Engine Control Module) is the main computer for the engine’s operations, like fuel and ignition. The TCM (Transmission Control Module) is a dedicated computer that controls only the functions of the automatic transmission, such as shift points and line pressure.
Where is the TCM located on my Yukon?
On the 2007-2009 GMC Yukon, the Transmission Control Module is typically found in the engine compartment, mounted on a bracket next to the battery.
Is there a core charge for this part?
No, there is no core charge. You are not required to send your old, faulty module back to us, which simplifies the repair process for you.