Restore Your Sierra’s Electrical System
Are you battling frustrating electrical problems in your 2003-2007 GMC Sierra Denali? Flickering lights, a dead HVAC system, or power windows with a mind of their own are classic signs of a failing Body Control Module (BCM). The BCM is the central command for your truck’s body electronics, and when it fails, it can cause a cascade of confusing issues. This replacement BCM, equivalent to part number 15137393, is the definitive solution to get your truck back to 100% functionality without an expensive trip to the dealership.
We take the guesswork and hassle out of the repair by pre-programming this module to your truck’s specific Vehicle Identification Number (VIN). This means it arrives ready for a true plug-and-play installation. Simply swap the part, and you’re back in business. This is the ideal fix for both seasoned mechanics looking for a reliable, time-saving part and DIY enthusiasts ready to tackle the job themselves.
I’ve seen hundreds of these GMT800-platform trucks roll into my bay with what owners describe as ‘haunted’ behavior. A common case was a 2005 Sierra where the radio would turn on by itself, the door locks would cycle while driving, and the A/C blower was completely unresponsive. The owner had already replaced the blower motor and resistor. A quick scan revealed a B1001 DTC and other communication errors. The root cause? A failing BCM. Internal solder joints and relays on the original boards just don’t last forever. Installing a quality, pre-programmed 2003-2007 Sierra Denali BCM is the most reliable and direct fix I’ve found for these exact symptoms.
Is Your Sierra Showing These Signs?
- ✔ Non-functional or intermittent power windows, door locks, or interior/exterior lights.
- ✔ HVAC system failure, including an unresponsive blower motor or climate controls.
- ✔ An active airbag warning light on the dash, often accompanied by Diagnostic Trouble Code (DTC) B1001.
- ✔ Vehicle security system acting up, leading to a no-start or crank-no-start condition.
- ✔ Erratic behavior from the windshield wipers or radio controls.
- ✔ A cluster of seemingly unrelated electrical trouble codes stored in the system.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your truck’s battery before starting any electrical work. This prevents short circuits and helps reset the vehicle’s electronic systems.
- ✔ Locate the BCM: On most 2003-2007 Sierra Denali 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.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be depressed. Once unplugged, unbolt or unclip the old BCM from its mounting bracket and remove it.
- ✔ Install the New Module: Mount your new, VIN-programmed BCM in the same location. Securely plug in all the electrical connectors, ensuring each one clicks firmly into place.
- ✔ Reconnect and Test: Reconnect the negative battery terminal. Start your truck and test all body functions—lights, locks, windows, wipers, and the HVAC system—to confirm the repair was successful.
Post-Installation Note: In some cases, an airbag light may persist. This requires a ‘Setup SDM Primary Key in BCM’ procedure with a professional scan tool. A brake pedal position relearn may also be needed on certain models.
Verified Vehicle Compatibility
This module is a direct replacement for part number 15137393 and other interchangeable numbers. It is guaranteed to fit the following vehicles:
SIERRA 1500 PICKUP 03-07 (Crew Cab, Classic Style ’07)
SIERRA 2500 PICKUP 03-07 (Crew Cab, Classic Style ’07)
SIERRA 3500 PICKUP 03-07 (Crew Cab, Classic Style ’07)
SIERRA DENALI 03-07 (Classic Style ’07)
YUKON & YUKON XL 1500/2500 03-06
SAVANA VAN 1500/2500/3500 04-07 (w/ commercial tradesman package opt PRP)
Chevrolet:
SILVERADO 1500 PICKUP 03-07 (Crew Cab, Classic Style ’07)
SILVERADO 2500 PICKUP 03-07 (Crew Cab, Classic Style ’07)
SILVERADO 3500 PICKUP 03-07 (Crew Cab, Classic Style ’07)
AVALANCHE 1500/2500 02-06
SUBURBAN 1500/2500 03-06
TAHOE 03-06
EXPRESS VAN 1500/2500/3500 04-07 (w/ commercial tradesman package opt PRP)
Cadillac:
ESCALADE, ESV, EXT 03-06
Hummer:
HUMMER H2 03-07
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s specific VIN and factory-calibrated software onto the module before shipping. This ensures it communicates perfectly with your truck’s other computers, making installation plug-and-play with no need for dealership programming.
Is this a difficult part for a DIYer to install?
Not at all. The installation is very straightforward, typically taking less than 15 minutes with basic hand tools. The BCM is easily accessible under the driver’s side dashboard.
Do I need to send my old BCM back? Is there a core charge?
No, there is absolutely no core charge. You can keep your old part, so there’s no need to worry about return shipping or waiting for a core refund.
My airbag light is on. Will this BCM fix it?
If the airbag light is caused by a faulty BCM (often with code B1001), this part will resolve the root cause. However, after installation, you may need a professional scan tool to perform an ‘SDM Key Setup’ to sync the new BCM with the airbag system and clear the light.
What if I have issues after installation?
This module is backed by a one-year warranty. Our expert support team is also available to help guide you through any post-installation procedures or troubleshooting you might encounter.