Tired of Chasing Electrical Gremlins in Your GM Truck?
If your 2003-2006 Chevrolet Avalanche 1500 is experiencing bizarre electrical issues like flickering lights, a dead instrument cluster, or power windows with a mind of their own, you’re not alone. After 20 years in the diagnostics bay, I’ve seen countless GM trucks and SUVs from this era develop these frustrating problems. The culprit is often a failing Body Control Module (BCM). This module is the central nervous system for your vehicle’s comfort and convenience features, and when it goes bad, it can make your truck feel possessed. This replacement BCM, part number 15136225, is the definitive solution to restore order and get your vehicle’s electronics working reliably again.
What sets our service apart is our professional Cloning Service. Instead of shipping you a blank module that requires an expensive trip to the dealership for programming, you send us your original BCM. We transfer all the critical vehicle-specific data—including VIN, mileage, and key information—to this replacement unit. The result is a true plug-and-play module, ready for installation right out of the box. This process eliminates compatibility errors and saves you hundreds of dollars in programming fees, making it the smartest choice for both DIY mechanics and professional shops.
A Technician’s Notebook: The Case of the Intermittent No-Start
A customer brought in his ’05 Silverado 2500HD with a maddening problem: sometimes it would start, sometimes it wouldn’t. The battery was new, the starter was fine, but the security light would flash randomly. He’d already replaced several parts. After hooking up the scan tool, I saw a slew of communication DTCs pointing to the BCM. A quick check of the BCM’s internal ground showed it was failing intermittently. Instead of a costly dealer replacement and programming, we used our cloning service. We transferred his data to a quality replacement BCM, and he had it back in his truck the next day. The problem was solved instantly. It’s a classic failure mode for these modules, and this 2003-2006 Avalanche 1500 BCM provides the same reliable fix.
Is Your Truck Showing These Telltale Signs?
A failing BCM can manifest in numerous ways. If you’re experiencing any of the following, it’s time to consider a replacement:
- âś” Unresponsive or erratic HVAC controls and blower motor function.
- âś” Power windows, door locks, or interior/exterior lights not working correctly.
- âś” An active airbag warning light, often with Diagnostic Trouble Code (DTC) B1001.
- âś” Malfunctioning security system, leading to a no-start or crank-no-start condition.
- âś” A cluster of seemingly unrelated electrical communication codes (U-codes).
- âś” Erratic wiper operation or radio issues.
Your 5-Minute BCM Swap Guide
Installation is a straightforward process that most DIYers can complete in their own driveway. No special tools are required.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the BCM: On most trucks and SUVs like the Avalanche, Silverado, and Tahoe, the BCM is located under the driver’s side of the dashboard, near the steering column. In Express or Savana vans, it’s typically behind the center dash.
- Swap the Module: Carefully unplug the electrical connectors from your old BCM. They have locking tabs, so be gentle. Remove any mounting screws or clips holding it in place. Install your newly cloned module and reconnect the connectors securely.
- Reconnect and Test: Reconnect the battery terminal. Start the vehicle and test all functions: lights, windows, locks, HVAC, and wipers to confirm the repair.
- Post-Install Checks: In some cases, an “Airbag System Sync” or “Brake Pedal Position Relearn” procedure may be needed if you see a related warning light. This requires a professional-grade scan tool.
Verified Fitment for Your GM Truck or SUV
This BCM is a direct replacement for a wide range of popular General Motors vehicles and is interchangeable with multiple part numbers, including 10383536, 15116066, 15136225, 15136877, 15137393, and more. It is guaranteed to fit the following models:
AVALANCHE 2500 02-06 Body Control (BCM); (under steering column)
CADILLAC ESCALADE, ESV, EXT 03-06 Body Control (BCM); (under steering column)
HUMMER H2 03-07 Body Control (BCM); (LH dash)
CHEVROLET SILVERADO & GMC SIERRA 1500/2500/3500 PICKUP (Crew Cab) 03-07 (Classic Style)
CHEVROLET SUBURBAN 1500/2500 03-06 Body Control (BCM); (under steering column)
CHEVROLET TAHOE & GMC YUKON/YUKON XL 1500/2500 03-06 Body Control (BCM); (under steering column)
CHEVROLET EXPRESS & GMC SAVANA VAN 1500/2500/3500 04-07 (w/commercial tradesman package)
Don’t let a faulty module keep your truck off the road. Order this pre-programmed 2003-2006 Avalanche 1500 BCM today and restore your vehicle’s full functionality with confidence.
Frequently Asked Questions
How does the Cloning Service work?
After you place your order, you’ll receive instructions to ship your original BCM to us. We extract the unique data from your module and flash it onto the replacement unit. This ensures 100% compatibility with your vehicle’s specific options and security system, eliminating the need for dealership programming.
Do I get my old BCM back?
Yes, your original module is always returned to you along with the programmed replacement unit. We do not keep customer cores, and there is no core charge.
Why is my airbag light on after installing the new BCM?
This can happen if the BCM and the Sensing and Diagnostic Module (SDM) lose their sync. A professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure to re-establish communication and turn off the light.
Is this a difficult part to install myself?
Not at all. For most DIYers, this is a very simple job. The BCM is typically held in with a few clips or screws and is easily accessible under the dashboard. The entire swap usually takes less than 15 minutes.
What happens if I install a BCM that isn’t cloned?
A non-programmed BCM will likely cause a no-start condition due to the anti-theft system (Passlock/VATS). It may also cause features like power windows or the HVAC system to not work correctly until it is programmed to your vehicle’s VIN by a dealer or a qualified locksmith.