Restore Full Electrical Function to Your GM Truck
Are you chasing down frustrating electrical gremlins in your GMC Sierra, Chevy Silverado, or Tahoe? Random warning lights, a dead HVAC system, or power windows with a mind of their own are classic signs of a failing Body Control Module (BCM). This module is the central command for your vehicle’s body electronics, and when it fails, it can cause a cascade of confusing issues. This OEM-quality replacement, equivalent to part number 15263497, is the definitive solution. We pre-program it to your truck’s specific VIN, so it arrives ready for a true plug-and-play installation, getting you back on the road without a mandatory trip to the dealership for expensive programming.
A Technician’s Notebook: The Ground Wire That Wasn’t
I once had a 2013 GMC Sierra in my bay with a textbook case of what looked like a bad ground. The dash lights would flicker, the radio would cut out on bumpy roads, and the door locks worked intermittently. The owner had already replaced the battery and cleaned every ground strap he could find. After an hour of diagnostics, my scanner pointed to communication errors originating from the BCM. We swapped in a VIN-programmed module, and every single issue vanished instantly. It’s a reminder that on modern trucks, the BCM is often the root cause of symptoms that mimic a simple wiring problem.
Is Your Truck Showing These Symptoms?
- ✔ Power windows, door locks, or mirrors not working or behaving erratically.
- ✔ Interior or exterior lights flickering, staying on, or not turning on at all.
- ✔ HVAC controls are unresponsive, or the blower motor works only on high or not at all.
- ✔ The security system acts up, causing no-start conditions or random alarm triggers.
- ✔ An airbag warning light is illuminated, often with a DTC like B1001 (Setup SDM Primary Key in BCM).
- ✔ Intermittent stalling or misfires linked to security system communication failures.
A Straightforward Guide to Your BCM Replacement
Replacing the 2013 Sierra Body Control Module is a job most DIYers can handle in under 15 minutes. It’s located in a tight spot, but requires no special tools for the physical swap.
- Safety First: Always disconnect the negative terminal on your vehicle’s battery before working on electrical components.
- Locate the BCM: On most GM trucks and SUVs of this era, you’ll find the BCM mounted under the driver’s side dashboard, to the left of the steering column. You may need to remove a lower dash panel for access.
- Disconnect and Remove: Carefully unplug the multiple wiring harness connectors from the old module. They have release tabs that need to be pressed. Once disconnected, unclip or unbolt the module from its mounting bracket.
- Install the New Module: Seat the new, pre-programmed BCM into the mounting bracket and securely plug in all the electrical connectors. You should hear a click as they lock into place.
- Reconnect Power: Re-attach the negative battery terminal. Turn the key to the ‘On’ position and test all functions—lights, locks, windows, wipers, and HVAC—to confirm the repair.
- Post-Install Steps: In some cases, an airbag light may remain on. This requires a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ function. A Brake Pedal Position relearn might also be needed.
Verified Vehicle Compatibility List
This module is a direct replacement for a wide range of General Motors trucks and SUVs. It is interchangeable with part numbers 25844480, 25835966, 15263363, 15878753, and others. Please verify your part number or contact us with your VIN to ensure perfect fitment.
ESCALADE & ESV/EXT 07-11
SIERRA 1500/2500/3500 & DENALI 07-13
SILVERADO 1500/2500/3500 07-13
SUBURBAN 1500/2500 07-11
TAHOE 07-11
YUKON & YUKON XL 07-11
Note: For 2007 models, this fits the ‘new style’ with a smooth door skin.
Frequently Asked Questions About the 2013 Sierra Body Control Module
Does this BCM really not require dealer programming?
That’s correct. We program the module to your vehicle’s VIN before shipping. This ensures it communicates correctly with your truck’s other computers right out of the box, saving you time and money.
Why is my airbag light still on after installation?
This is a common GM security feature. The new BCM needs to be electronically ‘introduced’ to the airbag system’s computer (SDM). This is done with a pro-level scan tool using the ‘Setup SDM Primary Key’ function. It’s a quick procedure for any competent repair shop.
What tools do I need for the installation?
For most models, you’ll only need basic hand tools like a socket wrench to disconnect the battery and possibly a trim removal tool or screwdriver to take off the lower dash panel. The module itself usually has clip-in connectors.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it without needing to send it back to us, making the process hassle-free.
Will this fix my truck’s intermittent starting problem?
It can. The BCM is a key part of the Pass-Key/Pass-Lock anti-theft system. If it’s failing, it can prevent the engine from starting. If your ‘Security’ light is on, a faulty BCM is a very likely cause.