Restore Peak Performance to Your GMC Yukon XL 1500
If you’re dealing with the frustration of a transmission that won’t shift correctly, gets stuck in gear, or triggers warning lights on your dash, you’re not alone. As a technician with over two decades of experience, I’ve seen countless GM trucks and SUVs, including the dependable Yukon XL, sidelined by a failing Transmission Control Module (TCM). The symptoms can be alarming, but the solution is straightforward. This OEM-quality T42 TCM, part number 24243901, is the definitive fix for your transmission woes, arriving fully programmed to your vehicle’s VIN for a true plug-and-play repair.
This isn’t just a replacement part; it’s a restoration of your vehicle’s core functionality. The TCM is the brain of your automatic transmission, managing everything from shift points and line pressure to torque converter lockup. When it fails, communication breaks down, leading to the erratic behavior you’re experiencing. Our module, loaded with the latest GM software updates specific to your Yukon, ensures that communication is restored perfectly, eliminating the need for an expensive trip to the dealership for programming.
From the Diagnostic Bay: A Common Yukon XL Case
A customer recently brought in his 2007 Yukon XL 1500, complaining it was stuck in what felt like 3rd gear (a classic ‘limp mode’ scenario) and the check engine light was on. A quick scan pulled code P0700 (Transmission Control System Malfunction) and a few solenoid circuit codes. Instead of starting a costly diagnostic rabbit hole chasing solenoids, my experience pointed straight to the TCM. These modules are known to fail internally, causing false solenoid codes. We ordered this exact pre-programmed T42 module. Less than 30 minutes after it arrived, the new module was in, codes were cleared, and the Yukon was shifting as smoothly as the day it left the factory. The customer saved hundreds on diagnostic labor and dealership programming fees.
Is Your Yukon Exhibiting These Transmission Problems?
A faulty TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module needs replacement. This is the first step in diagnosing your 2007-2008 Yukon XL 1500 TCM issues.
- ✔ Harsh, slamming, or erratic gear shifts.
- ✔ Vehicle is stuck in limp mode and will not shift out of 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A sudden drop in fuel economy.
- ✔ The transmission seems to slip between gears or fails to upshift/downshift.
A Straightforward Guide to Installation
One of the best features of this module is its simple, DIY-friendly installation. No specialized tools are needed, and you can have your truck back to normal in under half an hour. For the GMC Yukon XL, the TCM is typically located in the engine compartment, right next to the battery.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: Open the hood and find the TCM mounted next to the battery. It’s a silver box with several large electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harnesses from the old TCM. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New TCM: Mount your new, pre-programmed module onto the bracket and securely re-fasten the bolts. Reconnect the wiring harnesses, ensuring they click firmly into place.
- Final Steps: Reconnect the negative battery terminal. While the system may reset, it’s best practice to use a standard OBD2 scan tool to clear any stored fault codes. Start the vehicle and take it for a test drive to confirm smooth shifting.
Verified Fitment for Your General Motors Vehicle
This T42 TCM is a direct replacement for part number 24243901 and is interchangeable with many other service numbers. It is guaranteed to fit the following models, including the 2007-2008 Yukon XL 1500 TCM. Please verify your vehicle’s specific location, as it can vary.
- GMC YUKON XL 1500 07-08 Transmission; (next to battery)
- GMC YUKON 07-09 Transmission; (next to battery)
- Chevrolet Tahoe 07-09 Transmission; (next to battery)
- Chevrolet Suburban 1500 07-08 Transmission; (next to battery)
- Chevrolet Avalanche 1500 07-08 Transmission; (next to battery)
- GMC Sierra & Chevrolet Silverado (1500/2500) 07-13 Transmission; (next to battery)
- Cadillac DTS 06-11 Transmission; (RH front engine compartment)
- Buick Lucerne 06-11 Transmission; (LH engine compartment)
- And many more GM models from 2006-2014.
Frequently Asked Questions
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean for me?
It means we flash the module with the latest software from General Motors that is specific to your vehicle’s Vehicle Identification Number (VIN). This ensures it works perfectly with your Yukon’s engine and transmission configuration right out of the box, with no dealer programming required.
Will this fix my transmission that’s stuck in limp mode?
Yes, in a vast majority of cases. Limp mode is a protective measure triggered by the computer when it detects a critical fault. A failing TCM is one of the most common causes of this issue in GM vehicles. Replacing it often resolves the problem immediately.
Do I need any special tools for this installation?
No. Basic hand tools, such as a socket wrench set to remove the module’s mounting bolts and disconnect the battery, are all that is typically required. The entire process should take less than 30 minutes.
Is a core charge required? What do I do with my old part?
There is absolutely no core charge. You can keep your old module or dispose of it at your convenience. This saves you the hassle and expense of shipping a core back.
Will this part solve a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem and has requested the check engine light be turned on. While this module replacement often resolves the root cause that triggered the P0700, you should always clear codes after installation and confirm no other issues are present.