Tired of Chasing Electrical Gremlins in Your GMC Sierra?
If your 2003-2007 GMC Sierra 1500 is acting possessed—with flickering lights, a dead climate control system, or power windows with a mind of their own—you’re not alone. These frustrating and seemingly random issues often point to a single culprit: a failing Body Control Module (BCM). As the central command for your truck’s body electronics, a faulty BCM can cause chaos. This replacement BCM, part number 15064149, is the definitive solution, arriving pre-programmed to your truck’s VIN for a true plug-and-play repair.
A Technician’s Notebook: The Case of the Haunted Sierra
I had a 2005 Sierra 1500 in my bay that was driving the owner crazy. The radio would cut out, the driver’s side window wouldn’t roll down, and the HVAC blower was completely dead. He’d already replaced the blower motor resistor with no luck. After connecting my scanner, I saw a handful of communication codes (U-codes) and a B1001 for an airbag system fault. Instead of chasing each problem individually, experience pointed me straight to the BCM. A failing BCM often creates these phantom issues by disrupting the data network. We swapped in a VIN-programmed module, and instantly, every function was restored. It’s a classic failure on these GMT800 platforms.
Is Your Sierra Showing These Telltale BCM Failure Symptoms?
- âś” Your power windows, door locks, or interior lights work intermittently or not at all.
- âś” The HVAC system is unresponsive, or the blower motor won’t turn on.
- âś” The security system acts up, sometimes causing a no-start condition.
- âś” The airbag warning light is illuminated, often with a DTC like B1001 (Option Configuration Error).
- âś” You’re experiencing a variety of seemingly unrelated electrical problems.
- âś” Your diagnostic scanner shows communication errors or grounding fault codes.
A Straightforward Guide to Your BCM Installation
Replacing the 2003-2007 Sierra 1500 BCM is a job most DIYers can handle in under 15 minutes right in their driveway. Our VIN programming service means you can skip the expensive trip to the dealership.
- Safety First: Always disconnect the negative terminal from your truck’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: On most Sierra models, the BCM is located under the driver’s side of the dashboard, near the steering column. It’s a black plastic box with several large multi-pin connectors.
- Swap the Connectors: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Plug them securely into your new, pre-programmed module.
- Mount the New BCM: Secure the new module back into its mounting bracket.
- Power Up & Verify: Reconnect the battery terminal. Start the truck and test all the functions that were previously malfunctioning—lights, windows, locks, and HVAC—to confirm the repair.
Post-Installation Note: In some cases, an airbag light may persist. This requires a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure. Additionally, a Brake Pedal Position Relearn might be needed. There is no core charge for this part, so you can keep or discard your old module without any hassle.
Verified Vehicle Compatibility
This module is a direct replacement for part number 15064149 and other interchangeable numbers. While it is a perfect fit for the 2003-2007 Sierra 1500 BCM, it also fits a wide range of other GM vehicles. Please verify your specific model and options below.
AVALANCHE 2500 02-06 Body Control (BCM); (under steering column)
ESCALADE & ESV & EXT 03-06 Body Control (BCM); (under steering column)
HUMMER H2 04-07 Body Control (BCM); (LH dash)
HUMMER H2 03 Body Control (BCM); ID 8116
SIERRA 1500 PICKUP 03-06 Body Control (BCM); (under steering column), Crew Cab
SIERRA 1500 PICKUP 07 Body Control (BCM); classic style (creased door skin), (under steering column), Crew Cab
SIERRA 2500 PICKUP 03-05 Body Control (BCM); (under steering column), Crew Cab
SIERRA 2500 PICKUP 06-07 Body Control (BCM); (under steering column), Crew Cab
SIERRA 3500 PICKUP 03-05 Body Control (BCM); (under steering column), crew cab
SIERRA 3500 PICKUP 06-07 Body Control (BCM); (under steering column), crew cab
SIERRA DENALI 03-07 Body Control (BCM); (under steering column)
SILVERADO 1500 PICKUP 03-06 Body Control (BCM); (under steering column), Crew Cab
SILVERADO 1500 PICKUP 07 Body Control (BCM); classic style (creased door skin), (under steering column), Crew Cab
SILVERADO 2500 PICKUP 03-05 Body Control (BCM); (under steering column), Crew Cab
SILVERADO 2500 PICKUP 06-07 Body Control (BCM); (under steering column), Crew Cab
SILVERADO 3500 PICKUP 03-05 Body Control (BCM); (under steering column), crew cab
SILVERADO 3500 PICKUP 06-07 Body Control (BCM); (under steering column), crew cab
SUBURBAN 1500 & 2500 03-06 Body Control (BCM); (under steering column)
TAHOE 03-06 Body Control (BCM); (under steering column)
YUKON & YUKON XL 1500 & 2500 03-06 Body Control (BCM); (under steering column)
EXPRESS & SAVANA VANS 1500/2500/3500 04-07 Body Control (BCM); (center dash), w/commercial tradesman package (opt PRP)
Frequently Asked Questions
What does a Body Control Module do?
The BCM is a computer that acts as the central hub for your vehicle’s body-related electronics. It controls non-engine functions like power windows, door locks, interior and exterior lighting, wipers, the security system, and the HVAC climate controls.
Why is VIN programming so important?
VIN programming loads your truck’s specific software and options into the BCM. This ensures all features work correctly without requiring a trip to the dealership for expensive programming. It makes the installation a simple plug-and-play process.
Is this part difficult to install myself?
Not at all. For most DIYers with basic tools, the installation takes less than 15 minutes. It involves unplugging the old module and plugging in the new one. No complex procedures are needed for the initial setup.
What if my airbag light is on after installation?
If the airbag light remains on, it means the new BCM needs to be synced with the airbag’s computer (SDM). This requires a ‘Setup SDM Primary Key’ procedure, which can be done by a repair shop with a professional-grade diagnostic scanner.
Do I need to return my old BCM?
No. There is no core charge on this module. You can keep your original part without any extra fees or hassle.