Restore Smooth Shifting to Your GMC Yukon XL
If your 2007-2008 GMC Yukon XL 1500 is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, a failing Transmission Control Module (TCM) is the most likely culprit. As the electronic brain of your automatic transmission, the TCM dictates every gear change and torque converter operation. When it fails, it can make your reliable SUV feel unpredictable and unsafe. This OEM-quality T42 TCM, part number 24241806, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
A Technician’s Notebook: The Ghost in the Transmission
I had a 2008 Yukon XL 1500 in the shop last month that was giving its owner fits. The truck would randomly refuse to shift out of 3rd gear, but only after it was fully warmed up. There were no specific solenoid codes, just a general P0700 (Transmission Control System Malfunction). After checking the fluid and wiring harness, everything looked fine. Experience told me this was a classic case of heat-induced failure inside the TCM. The internal circuits become unstable at operating temperature, causing these intermittent ‘ghost’ problems. We installed one of these VIN-programmed modules, and the customer called back a week later to say his Yukon was driving like it just rolled off the showroom floor. This is the fix that works.
Is Your Yukon Exhibiting These Telltale Signs?
A faulty TCM can manifest in several ways. If you’re noticing any of the following, it’s time to consider a replacement. Getting ahead of the problem can prevent more significant transmission damage down the line.
- ✔ Abrupt, jerky, or delayed gear shifts.
- ✔ The vehicle enters ‘limp mode,’ often stuck in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, especially P0700, P0750, or other solenoid-related faults.
- ✔ Failure to upshift or downshift, leading to poor acceleration and fuel economy.
- ✔ Inconsistent communication with the module or complete transmission failure.
A Straightforward Guide to Your 2007-2008 Yukon XL 1500 TCM Installation
One of the best features of this module is its simple installation. You don’t need specialized tools or a trip to the dealership. For your Yukon XL, the process is quick and can be done in your own garage in under 30 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic work.
- Locate the Module: On the 2007-2008 Yukon XL 1500, the TCM is conveniently located in the engine bay, right next to the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new, pre-programmed module onto the bracket and securely plug in the electrical connectors. You’ll hear a click when they are fully seated.
- Final Steps: Reconnect the negative battery terminal. While the system may reset on its own, it’s best practice to use a basic OBD2 scan tool to clear any stored transmission codes. Start the vehicle and enjoy restored performance!
Verified to Fit These GM Models
This T42 TCM is a direct replacement for a wide range of General Motors vehicles, ensuring broad compatibility. It is interchangeable with part numbers 24252114, 24234503, 24241806, and more.
- ✔ GMC: YUKON XL 1500 (07-08), YUKON (07-09), SIERRA 1500/2500 (07-13), SAVANA 1500/2500/3500 (06-14), ENVOY (06-09), CANYON (08-12)
- ✔ Chevrolet: TAHOE (07-09), SILVERADO 1500/2500 (07-13), SUBURBAN 1500 (07-08), AVALANCHE 1500 (07-08), EXPRESS 1500/2500/3500 (06-14), IMPALA (06-11), MALIBU (06-10), COBALT (06-10), HHR (06-11), COLORADO (08-12), MONTE CARLO (06-07), SSR (05-06), TRAILBLAZER (06-09)
- ✔ Cadillac: DTS (06-11)
- ✔ Buick: LACROSSE (06-09), LUCERNE (06-11), ALLURE (06-09), RAINIER (06-07), RENDEZVOUS (06-07), TERRAZA (06-07)
- ✔ Pontiac: G6 (06-10), GRAND PRIX (06-08), G5 (07-10), PURSUIT (06)
- ✔ Saturn: VUE (07-10), AURA (07-09), ION (06-07)
- ✔ Hummer: H3 (08-10)
- ✔ Saab: 9-7X (06-09)
Frequently Asked Questions
What does ‘VIN Programmed’ mean for me?
It means 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 vehicle’s other computers right out of the box, with no expensive dealership programming required.
Do I need to send my old TCM back?
No, there is no core charge for this part. You can keep your old module or dispose of it, saving you the time and hassle of return shipping.
Is this part difficult to install for a DIYer?
Not at all. For most vehicles like the Yukon, it’s located in an easy-to-access spot in the engine bay and requires only basic hand tools. The entire job typically takes less than 30 minutes, making it a very popular DIY repair.
Will this fix a P0700 code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause, it’s wise to scan for more specific codes (like P0751, P0756, etc.) to confirm the diagnosis. In many cases, a failing TCM is the source of the P0700.
What kind of warranty is included?
This module is backed by our one-year, hassle-free warranty, giving you peace of mind and confidence in your repair.