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 signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating smooth gear changes, managing torque converter lockup, and ensuring overall drivetrain efficiency. When it fails, it can lead to poor performance, decreased fuel economy, and potentially catastrophic transmission damage if left unaddressed.
This genuine OEM-quality T42 Transmission Control Module, part number 24238856, is the definitive solution for restoring your vehicle’s factory performance. Unlike generic modules that require expensive and time-consuming trips to the dealership for programming, this unit arrives at your door pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN). This ensures a seamless, plug-and-play installation that gets you back on the road quickly and confidently.
From the Diagnostic Bay
We had a 2008 Sierra come in with a P0700 code and harsh 1-2 shifts. The owner had already replaced two shift solenoids based on a generic code reader’s suggestion, but the problem persisted. After a quick scan with our professional equipment, we identified intermittent communication loss with the TCM. Instead of throwing more parts at it, we installed a VIN-programmed T42 module. The truck immediately shifted like new. This highlights a critical point: often, solenoid codes are symptoms, not the root cause. The failing TCM is the real culprit, and replacing it first can save hundreds in unnecessary parts and labor.
Diagnosing and Solving Issues with Your 2007-2008 Yukon XL TCM
A faulty 2007-2008 Yukon XL TCM can manifest in various ways, often being misdiagnosed as an internal transmission failure. Understanding the symptoms is the first step toward a correct and cost-effective repair. This module is engineered to resolve these issues by restoring precise electronic control over your transmission’s mechanical functions. By providing the latest GM software updates during our VIN programming process, we ensure optimal shift patterns and long-term reliability for your 4L60E, 4L65E, or 4L70E transmission.
Key Symptoms of a Failing T42 TCM
- ✔ Erratic Shifting: Experiencing harsh, banging shifts, or unpredictable gear changes during acceleration or deceleration.
- ✔ Stuck in Gear: The vehicle may get stuck in one gear (often 2nd or 3rd), a condition known as “limp mode,” 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) and various solenoid-specific codes (e.g., P0750, P0751).
- ✔ Delayed Engagement: A noticeable pause when shifting from Park into Drive or Reverse.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lockup can lead to a significant drop in MPG.
- ✔ No Communication: A scan tool may be unable to communicate with the TCM, indicating a complete module failure.
Simple Installation, Lasting Results
Replacing the TCM is a straightforward job that can be completed in your own driveway. On the 2007-2008 Yukon XL 1500, the TCM is typically located in the engine compartment, next to the battery. Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Because our module is pre-programmed, there are no extra steps. Once installed, clear any stored DTCs with a basic scan tool, and you’re ready to drive. Best of all, there’s no core charge, so you don’t have to worry about the hassle and expense of sending your old part back.
This module is a direct replacement for a wide range of GM part numbers, including 24252114, 24234503, 24230461, 24238856, and more, ensuring broad compatibility across many GM trucks, SUVs, and cars from 2006-2014. Don’t let a faulty 2007-2008 Yukon XL TCM keep your vehicle sidelined. Order today for a reliable, pre-programmed solution that restores the smooth, dependable performance you expect.
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. This Transmission Control Module comes fully pre-programmed to your vehicle’s specific VIN. This makes it a true plug-and-play solution, saving you the time and expense of a dealership visit.
Where is the TCM located on my 2007-2008 Yukon XL 1500?
On the 2007-2008 GMC Yukon XL 1500, the T42 TCM is typically found in the engine bay, mounted next to the battery. Always disconnect the battery’s negative terminal before beginning the replacement process.
Will this fix transmission codes like P0700?
Yes, in many cases. A P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is the source of the electrical fault, replacing it with this programmed unit will resolve the code and the underlying issue.
What happens if I continue driving with a bad TCM?
Continuing to drive with a failing TCM can lead to more severe and expensive problems. Poor shifting can cause excessive wear on clutches and bands inside the transmission, potentially leading to a complete mechanical failure requiring a full transmission rebuild.
Is a core charge required for this part?
No, there is no core charge for this module. You can keep your old part without any additional fees or the hassle of returning it.