Restore Peak Transmission Performance in Your GMC Yukon XL 1500
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 powertrain efficiency. When it falters, your driving experience and vehicle reliability are severely compromised. This genuine GM T42 TCM, service part number 24240449, is the definitive solution to restore your vehicle’s factory performance and dependability.
From the Diagnostic Bay
We had a 2008 Yukon XL 1500 come into the shop that the owner described as “possessed.” It would slam into gear one moment and refuse to shift out of second the next. The check engine light was on, and a scan revealed a generic P0700 transmission fault code along with several solenoid circuit errors. After verifying the wiring and solenoids were intact, we identified a faulty TCM. Instead of a costly trip to the dealer, we installed one of our VIN-programmed T42 modules. The installation took less than 30 minutes. After clearing the codes, the Yukon shifted like it just rolled off the assembly line. The customer was thrilled to have their reliable family hauler back on the road without the dealership hassle.
Diagnosing a Faulty 2007-2008 Yukon XL TCM
A failing transmission module can manifest in various ways, often mimicking mechanical transmission problems. Before condemning your transmission, it’s crucial to check for these common electronic symptoms. Replacing a faulty TCM can save you from a much more expensive and unnecessary transmission rebuild. If your Yukon exhibits any of the following behaviors, the TCM is a likely culprit.
Common Failure Symptoms
- ✔️ Harsh, jerky, or unpredictable gear shifts.
- ✔️ The vehicle gets stuck in a single gear (limp mode), often 2nd or 3rd.
- ✔️ Illumination of the Check Engine Light or Transmission Warning Light.
- ✔️ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other transmission-related codes are stored.
- ✔️ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔️ A noticeable decrease in fuel economy.
- ✔️ Complete failure to shift gears, either up or down.
The Plug-and-Play Advantage: VIN Programmed for Your Yukon
The biggest hurdle in replacing modern electronic modules is programming. This module eliminates that problem entirely. We pre-program each TCM to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This crucial step ensures that the module communicates flawlessly with your Yukon’s Engine Control Unit (ECU) and other onboard systems. It arrives loaded with the latest GM software updates, making the installation a simple plug-and-play process. There is no need for expensive scan tools or a trip to the dealership for programming—just install the part, and you’re ready to drive.
This T42 TCM is a direct-fit replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is an exact match for part number 24240449 and interchanges with several other service numbers, including 24252114, 24234503, and 24256960, guaranteeing perfect fitment and function.
Frequently Asked Questions
Why is VIN programming so important for a TCM?
VIN programming loads your vehicle’s specific software, including shift strategies, torque converter settings, and communication protocols. Without it, the TCM cannot correctly control the transmission or communicate with other vehicle computers, leading to poor performance or a no-start condition.
Can I install this module myself?
Yes, installation is straightforward for someone with basic mechanical skills. 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 old module’s electrical connectors, unbolt it, and install the new one. The entire process usually takes under 30 minutes.
What happens if I continue driving with a bad TCM?
Continuing to operate your vehicle with a faulty TCM can lead to more severe issues. Poor shifting can cause premature wear on clutches and other internal transmission components, potentially leading to a catastrophic mechanical failure that is far more costly to fix.
Is there a core charge for this part?
No, we do not require a core charge. You can keep your old part without the hassle of returning it, saving you time and money on shipping.
How do I provide my VIN for programming?
You can enter your vehicle’s 17-digit VIN during the checkout process. Please double-check it for accuracy to ensure the programming is correct for your specific Yukon XL.