End the Electrical Gremlins in Your GM Truck
If you’re dealing with bizarre electrical issues in your 2003-2007 GMC Sierra 3500, you’re not alone. Flickering lights, a dead HVAC system, or a security light that won’t turn off are classic signs of a failing Body Control Module (BCM). As the central hub for your truck’s body electronics, a faulty BCM can cause a cascade of frustrating problems. This OEM-quality replacement, part number 15136877, 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, saving you hundreds of dollars and a trip to the dealership.
A Technician’s Notebook: The Common BCM Failure
A customer’s ’06 Sierra 3500 came into my shop last month with a laundry list of complaints: the radio would cut out, the driver’s side power window was dead, and the airbag light was on. The owner had already replaced the window switch and checked fuses. After hooking up my scanner, I saw a slew of communication codes pointing to the BCM. On these GMT800 platforms, I’ve seen dozens of BCMs fail due to cracked solder joints on the internal circuit board from years of vibration and thermal cycles. This particular module, part 15136877, is a direct replacement that restores those critical communication pathways and gets all accessories working in harmony again.
Is Your Sierra 3500 Showing These Electrical Faults?
- ✔ The HVAC blower motor is intermittent or completely non-functional.
- ✔ Your airbag warning light is illuminated, often with a B1001 diagnostic trouble code.
- ✔ Power windows, door locks, or interior/exterior lights work sporadically or not at all.
- ✔ The factory security system acts up, causing a no-start condition or random alarm triggers.
- ✔ You’re experiencing strange grounding issues or a parasitic battery drain.
- ✔ Your scan tool shows multiple communication DTCs related to body systems.
A Straightforward Guide to Your BCM Installation
Replacing the 2003-2007 Sierra 3500 Body Control Module is a job most owners can handle in their driveway in under 10 minutes. No special tools are required.
- Safety First: Always disconnect the negative terminal from your truck’s battery to prevent electrical shorts and help reset system memory.
- Locate the BCM: On most Sierra and Silverado models, the BCM is located under the driver’s side of the dashboard, just to the left of the steering column. It’s a black box with several large multi-pin connectors.
- Remove the Old Module: Carefully depress the locking tabs on each electrical connector and pull them straight out. The module itself is typically held in place by simple clips or a few small bolts. Remove it from its bracket.
- Install the New BCM: Snap the new, pre-programmed module into the mounting bracket. Firmly reconnect all electrical harnesses, ensuring each one clicks securely into place.
- Reconnect Power: Re-attach the negative battery terminal and tighten it securely.
- Post-Installation Procedures: Start the vehicle. If the airbag light remains on, a ‘Setup SDM Primary Key in BCM’ procedure must be performed with a compatible high-end scan tool. Some vehicles may also benefit from a brake pedal position sensor recalibration to ensure proper brake light function.
Guaranteed Fitment for Your GM Truck or SUV
This module is a direct replacement for part number 15136877 and other interchangeable numbers. It is guaranteed to fit the following vehicles, typically located under the steering column unless otherwise noted:
Cadillac:
Escalade, ESV, EXT (2003-2006)
Chevrolet:
Avalanche 1500/2500 (2003-2006)
Silverado 1500/2500/3500 Crew Cab (2003-2007 Classic)
Suburban 1500/2500 (2003-2006)
Tahoe (2003-2006)
Express Van 1500/2500/3500 (2004-2007, Center Dash)
GMC:
Sierra 1500/2500/3500 Crew Cab (2003-2007 Classic)
Sierra Denali (2003-2007 Classic)
Yukon & Yukon XL 1500/2500 (2003-2006)
Savana Van 1500/2500/3500 (2004-2007, Center Dash)
Hummer:
H2 (2003-2007, LH Dash)
Frequently Asked Questions
Does this BCM really not require a trip to the dealer?
That’s correct. We program the module to your vehicle’s VIN before shipping. This means it’s ready for installation right out of the box, with no additional programming needed for standard functions like power windows, locks, and lights to work.
What tools do I need to clear the airbag light after installation?
To clear an airbag light caused by BCM replacement, you will need a bi-directional scan tool capable of performing the ‘Setup SDM Primary Key in BCM’ function. Many professional-grade scanners from brands like Autel or Snap-on can do this.
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 the hassle of returning it to us.
What is the warranty on this part?
This Body Control Module comes with a one-year, unlimited mileage warranty, giving you peace of mind.
Will this fix my truck’s no-start problem?
If your no-start issue is caused by the BCM losing communication with the Passlock security system, then yes, replacing it with this pre-programmed module will often resolve the problem.