Restore Peak Transmission Performance in Your GMC Yukon XL
Is your 2007 or 2008 GMC Yukon XL 1500 suffering from erratic shifting, delayed gear engagement, or a frustrating “limp mode”? These are classic symptoms of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every shift with precision. When it fails, it can lead to poor performance, decreased fuel economy, and potentially catastrophic transmission damage. This OEM-quality T42 TCM, service number 24239224, is the definitive solution, pre-programmed to your vehicle’s specific VIN for a true plug-and-play installation.
From the Diagnostic Bay
We had a 2008 Tahoe come in that the owner described as ‘possessed.’ It would slam into gear from a stop and refuse to shift past 3rd on the highway. The check engine light was on, and the codes pointed to multiple solenoid circuit failures. A novice might start replacing solenoids, a costly and time-consuming job inside the transmission. However, experience told us that multiple, simultaneous electronic failures often point to the controller, not the components. We swapped in a VIN-programmed T42 TCM, cleared the codes, and the Tahoe drove like it just rolled off the assembly line. The issue wasn’t the transmission itself, but the module commanding it.
Common Symptoms of a Failing GM T42 TCM
- ✔ Harsh, jerky, or unpredictable gear shifts.
- ✔ The vehicle gets stuck in a single gear (limp mode) and will not upshift or downshift.
- ✔ Illumination of the Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ A noticeable delay when shifting from Park into Drive or Reverse.
- ✔ Poor acceleration and a significant drop in fuel efficiency.
- ✔ Complete loss of transmission function in severe cases.
Why Choose Our 2007-2008 Yukon XL TCM?
This isn’t just a replacement part; it’s a complete solution designed for reliability and ease of use. Our key advantage is the comprehensive VIN programming service included with every module. When you place your order, we flash the unit with the latest GM software specific to your Yukon XL. This critical step ensures that the TCM communicates flawlessly with your vehicle’s engine control module (ECM) and other systems, delivering optimal shift points, torque converter lockup, and fuel strategy from the moment you install it. You bypass the expensive and time-consuming trip to the dealership for programming.
Simple, Direct-Fit Installation
For the 2007-2008 GMC Yukon XL 1500, the TCM is conveniently located in the engine compartment, typically next to the battery. Installation is a straightforward process that can be completed in under 30 minutes with basic hand tools. Simply disconnect the vehicle’s battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect the battery, and you’re ready to go. We recommend using a basic OBD2 scanner to clear any stored fault codes after installation to ensure a clean slate for the new module.
This module is a direct replacement for a wide range of GM part numbers, including 24252114, 24234503, 24230461, 24239224, and many more. It is engineered to meet or exceed original equipment specifications, providing a dependable, long-term fix for your transmission woes. Plus, with no core charge, you don’t have to worry about the hassle and expense of returning your old, faulty part.
Frequently Asked Questions
What is the primary function of the T42 TCM?
The T42 Transmission Control Module (TCM) acts as the central computer for your automatic transmission. It processes data from various sensors (like vehicle speed, engine RPM, and throttle position) to control shift solenoids, manage hydraulic pressure, and engage the torque converter clutch, ensuring smooth and efficient gear changes.
Do I need a professional mechanic to install this part?
While professional installation is always an option, this part is designed for straightforward DIY installation. Since it comes pre-programmed to your VIN, the most complex step (software flashing) is already done. With its accessible location on the Yukon XL and simple bolt-on design, many owners with basic mechanical skills can perform the replacement themselves.
What happens if I continue driving with a bad TCM?
Driving with a faulty TCM is not recommended. It can lead to progressively worse shifting, internal transmission damage from harsh engagement and improper fluid pressure, and leave you stranded if the vehicle enters a permanent limp mode or fails to engage a gear entirely. Prompt replacement is the best course of action.
How does the VIN programming process work?
During checkout, you will provide your vehicle’s 17-digit VIN. Our technicians use this number to load the exact GM-certified software calibration for your specific vehicle model, year, and powertrain configuration onto the module before it ships. This ensures perfect compatibility and performance right out of the box.
Is there a core charge for this module?
No, there is absolutely no core charge for this transmission control module. You can keep your old part without any additional fees or the need to ship it back to us, simplifying the repair process for you.