Restore Full Functionality to Your GM Truck or SUV
If you’re dealing with baffling electrical issues in your 2007-2011 GMC Yukon XL 1500, you’re not alone. As the central command for your vehicle’s body electronics, a failing Body Control Module (BCM) can cause a cascade of frustrating problems. This genuine quality replacement, equivalent to part number 20939138, is the definitive solution. We pre-program it to your vehicle’s specific VIN, ensuring it works right out of the box with no expensive dealership trips for programming. It’s designed to restore control over everything from your power windows and door locks to the HVAC system and security features, making your truck feel like new again.
From the Diagnostic Bay
I recently had a 2010 Silverado in the shop with a laundry list of complaints from the owner. The radio would cut out, the driver’s side window wouldn’t go down, and the AC blower was completely dead. He’d already replaced the blower motor resistor with no luck. After hooking up the scanner, I saw a handful of communication codes and a specific BCM internal failure code. These GMT900 platform trucks are notorious for BCM failures causing these exact kinds of ‘ghost’ issues. Instead of a costly diagnostic rabbit hole, we installed a VIN-programmed BCM. In under 10 minutes, the windows, radio, and AC were all working perfectly. It’s a common repair, and having a pre-programmed module is the most efficient fix for both pros and DIYers.
Is Your GM Truck Showing These Symptoms?
- ✔ Erratic or non-functional power windows, door locks, or interior lights.
- ✔ HVAC controls not responding or blower motor working intermittently.
- ✔ The security or anti-theft system acting up, sometimes preventing the engine from starting.
- ✔ An airbag light on the dash, often with a diagnostic trouble code like B1001.
- ✔ Strange electrical behavior, such as wipers turning on by themselves or gauges acting erratically.
- ✔ Communication loss codes with other modules (U-codes).
A Straightforward Guide to Installation
Replacing the BCM is a simple job that most vehicle owners can complete in their driveway. It’s located under the driver’s side dash, near the steering column.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on electrical components.
- Locate the Old Module: Find the BCM under the dashboard. It will have several large multi-pin connectors attached to it.
- Swap the Connectors: Carefully release the locking tabs on each electrical connector and unplug them from the old BCM. Plug them securely into your new, pre-programmed module.
- Secure the New BCM: Mount the new module in the same position as the original.
- Reconnect and Test: Reconnect the negative battery terminal. Start your vehicle and test all functions—lights, locks, windows, radio, and HVAC—to confirm the repair was successful.
Important Post-Installation Note: In some cases, particularly if you had an airbag light on, a ‘Setup SDM Primary Key in BCM’ procedure may be needed. This requires a bi-directional scan tool and syncs the new BCM with the airbag system. A brake pedal position relearn might also be necessary on certain models to ensure proper brake light and traction control operation.
Guaranteed Fitment for Your GM Vehicle
This module is a direct replacement for part number 20939138 and other interchangeable numbers, providing a perfect fit for a wide range of General Motors trucks and SUVs. This includes many Chevrolet Silverado, Suburban, Tahoe, Avalanche; GMC Sierra, Yukon, Yukon XL; and Cadillac Escalade models. Please verify your specific model and year in our fitment list or contact us with your VIN for confirmation.
Frequently Asked Questions
What exactly does a Body Control Module do on a Yukon XL 1500?
The BCM is like the brain for your vehicle’s comfort and convenience features. It controls non-engine related functions, including the power windows, door locks, interior and exterior lighting, wipers, security system, and the heating and air conditioning (HVAC) system.
Is this module really ‘plug-and-play’?
Yes. Because we program the module to your vehicle’s VIN before shipping, it eliminates the need for any additional programming from a dealership. You can simply install it, and it will communicate correctly with your vehicle’s other systems.
Why is VIN programming so important?
VIN programming loads your vehicle’s specific software and options into the BCM. Without it, the module wouldn’t know which features your truck has (like power-folding mirrors or a sunroof), leading to improper function or features not working at all.
What if my airbag light is on after I install the new BCM?
This can happen. It means the new BCM needs to be electronically ‘introduced’ to the airbag system’s Sensing and Diagnostic Module (SDM). This is done with a professional scan tool using the ‘Setup SDM Primary Key in BCM’ function. It’s a quick procedure for any well-equipped shop.
Do I have to send my old BCM back?
No. There is no core charge for this part. You can keep your old module, saving you the time and hassle of a return shipment.