Is Your GM Truck or SUV Plagued by Baffling Electrical Issues?
If you’re dealing with flickering lights, unresponsive power windows, a malfunctioning security system, or an HVAC system with a mind of its own, the culprit is likely a failing Body Control Module (BCM). The BCM is the central command center for your vehicle’s body electronics, and when it starts to fail, it can cause a cascade of frustrating and seemingly unrelated problems. This genuine GM Body Control Module, part number 25844480 (interchangeable with 15926094), is the definitive solution for restoring full electrical functionality to your vehicle.
From the Diagnostic Bay
We had a 2013 GMC Sierra 3500 come into the shop with a laundry list of complaints from the owner. The radio would cut out, the dome light wouldn’t turn off, and the power locks worked only half the time. He had already replaced the battery and checked fuses with no luck. After connecting our scanner, we saw multiple communication error codes pointing towards the BCM. Instead of a complex and costly wiring chase, we installed a VIN-programmed BCM. In under 10 minutes, every single one of his electrical gremlins was gone. It’s a perfect example of how one component can solve a dozen problems.
Common Symptoms of a Failing BCM
- ✔ Power windows, door locks, or mirrors not working or operating erratically.
- ✔ Interior or exterior lights staying on, flickering, or not turning on at all.
- ✔ HVAC controls are unresponsive, or the blower motor works intermittently.
- ✔ The vehicle’s security system malfunctions, causing false alarms or starting issues.
- ✔ An airbag warning light is illuminated on the dash, often with DTC B1001.
- ✔ Unexplained battery drain when the vehicle is turned off.
- ✔ Intermittent stalling, misfires, or other grounding-related performance problems.
The Plug-and-Play Solution for Your 2013 Sierra Denali 3500 BCM
Forget expensive dealership visits and the hassle of programming. We take care of the hard part for you. This module arrives at your door pre-programmed to your vehicle’s specific VIN. This ensures that all factory settings and security information are correctly loaded for a seamless, plug-and-play installation. Simply locate your old BCM (typically under the driver’s side dash), disconnect it, and plug this one in. This process restores factory performance and communication between all your vehicle’s electronic systems.
Installation and Post-Install Notes
Installation is straightforward, but in some cases, additional steps may be required. If the airbag warning light appears after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ function. This syncs the new BCM with the airbag system. Additionally, some models may require a ‘Brake Pedal Position Relearn’ to ensure proper brake light and traction control operation. Best of all, there is no core charge—you can keep your old part without any extra fees.
Frequently Asked Questions
What is a Body Control Module (BCM)?
The BCM is a computer in your vehicle that controls and monitors a wide range of electronic accessories not related to the engine, such as power windows, locks, lights, wipers, and the security system.
Will I need to have this module programmed by a dealer?
No. This module comes pre-programmed to your vehicle’s VIN. It is ready for installation right out of the box, saving you time and money on dealership programming fees.
Where is the BCM located on my 2013 Sierra Denali 3500?
The BCM is typically located under the driver’s side dashboard, near the steering column. Installation usually takes less than 15 minutes with basic tools.
What if my airbag light is on after I install the new BCM?
If the airbag light is on, it means the new BCM needs to be synced with the airbag system’s SDM. This requires a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep or dispose of your original module without any additional cost or hassle.