Restore Full Electrical Function to Your GM Truck or SUV
If your 2013 GMC Sierra Denali 2500 is plagued by strange electrical issues, a failing Body Control Module (BCM) is often the culprit. This critical component acts as the central nervous system for your vehicle’s body electronics, managing everything from your power windows and door locks to the HVAC system and interior lights. A faulty BCM can lead to a cascade of frustrating problems that can be difficult to diagnose. This genuine GM BCM, part number 15901388 (interchangeable with 25844480 and others), arrives pre-programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership programming and ensuring a straightforward, plug-and-play installation.
We had a 2013 Sierra Denali 2500 come into the shop with a list of bizarre symptoms. The radio would turn on and off by itself, the driver’s side window wouldn’t roll down, and the airbag light was on. The owner had already replaced the window switch and checked fuses with no luck. After connecting our scanner, we saw multiple communication codes pointing to the BCM. Instead of chasing individual components, we identified the central failure. Installing a VIN-programmed 2013 Sierra Denali BCM resolved all the issues at once, saving the customer time and money on further diagnostics.
Symptoms of a Failing Body Control Module
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ HVAC blower motor not working or climate controls behaving erratically.
- ✔ Airbag warning light illuminated on the dash, often with DTC B1001.
- ✔ Security system malfunctions, causing no-start conditions or random alarm activation.
- ✔ Interior or exterior lights (headlights, dome lights) not working correctly.
- ✔ Windshield wipers operating randomly or not at all.
- ✔ A variety of communication-related Diagnostic Trouble Codes (DTCs).
Your Plug-and-Play Solution: The 2013 Sierra Denali BCM
Don’t let electrical gremlins keep your truck off the road. This module is the definitive solution for restoring your vehicle’s factory functions. We handle the complex programming so you don’t have to. Simply provide your VIN during checkout, and we’ll flash the module with the latest GM software specific to your vehicle’s configuration. This ensures all systems communicate correctly from the moment you plug it in.
Installation and Post-Install Procedures
The BCM is typically located under the driver’s side dashboard, near the steering column, making physical installation a quick process. After connecting the new module, some vehicles may require additional electronic procedures for full system integration:
- Airbag System Sync: If the airbag warning light remains on after installation, a technician will need to perform the ‘Setup SDM Primary Key in BCM’ procedure using a professional scan tool. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: In some cases, a brake pedal position sensor relearn may be necessary to ensure proper brake light and stability control operation.
This module is a direct replacement for a wide range of GM part numbers, including 25835966, 15901388, 20939137, and 22860591. With no core charge, you can complete the repair without the hassle of returning your old part.
Frequently Asked Questions
Do I need to take this BCM to the dealer for programming?
No. This Body Control Module comes fully pre-programmed to your vehicle’s VIN. It is ready for installation right out of the box, saving you a trip to the dealership.
What is the most common sign of a bad BCM in a Sierra?
One of the most common signs is a combination of unrelated electrical issues, such as the radio, power locks, and interior lights malfunctioning at the same time. Erratic HVAC behavior is also a strong indicator.
Where is the BCM located on my 2013 Sierra Denali?
The BCM is located under the driver’s side of the dashboard, usually attached to a bracket near the steering column.
What happens if my airbag light is still on after installing the new BCM?
If the airbag light persists, it means the new BCM needs to be electronically synced with the vehicle’s Sensing and Diagnostic Module (SDM). This requires a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure.
Is there a core charge for this part?
No, there is no core charge. You can keep your old module without any additional fees or hassle.