Fix Your Tahoe’s Electrical Headaches for Good
Are you tired of dealing with baffling electrical issues in your 2003-2006 Chevrolet Tahoe? One minute the power windows work, the next they don’t. The A/C blower motor has a mind of its own, and a persistent airbag light is staring you down. These aren’t just random glitches; they’re classic signs of a failing Body Control Module (BCM). As the central command for your vehicle’s comfort and security features, a faulty BCM can cause widespread and frustrating problems. This replacement module, part number 15137393, is the definitive solution to restore full functionality and peace of mind.
Our unique Cloning Service makes this repair easier than ever. Simply send us your original BCM, and we’ll transfer all its vital data—including key information and vehicle-specific settings—to this replacement unit. The result? A true plug-and-play module that requires no expensive trip to the dealership for programming. This service ensures your vehicle accepts the new module without any security lockouts or compatibility errors, making it a perfect fix for both seasoned mechanics and first-time DIYers. Get your 2003-2006 Tahoe BCM back to operating like new.
From the Diagnostic Bay: The Case of the Intermittent Blower
A customer brought in a 2005 Tahoe, complaining that his A/C blower would only work on high speed, and sometimes not at all. He’d already replaced the blower motor and the resistor, but the problem persisted. After hooking up my scan tool, I noticed several communication DTCs (U-codes) pointing to the BCM. In my 20+ years of experience, I’ve seen that when multiple, unrelated body systems act up, the BCM is the prime suspect. The internal circuits responsible for sending the variable voltage signal to the blower resistor had failed. We performed our cloning service on a replacement 2003-2006 Tahoe BCM, he installed it in 10 minutes, and his climate control was fully functional again. It’s a common failure point I’ve diagnosed on hundreds of these GM trucks and SUVs.
Is Your Tahoe Exhibiting These Failure Symptoms?
A failing BCM can manifest in numerous ways. If you’re experiencing any of the following, it’s highly likely your BCM is the culprit:
- ✔ Intermittent or non-functional power windows, door locks, or interior lights.
- ✔ HVAC and climate control problems, such as a blower motor stuck on one speed or not working at all.
- ✔ An illuminated airbag light on the dash, often accompanied by DTC B1001 (Option Configuration Error).
- ✔ Vehicle security system malfunctions, leading to a no-start or crank-no-start condition.
- ✔ Erratic behavior from windshield wipers or exterior lighting.
- ✔ A cluster of seemingly unrelated diagnostic trouble codes stored in the system.
A Straightforward Guide to BCM Installation
Replacing your BCM is a quick job that typically takes less than 15 minutes. Our cloning service eliminates the most difficult part—the programming.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the BCM: On most 2003-2006 Tahoes and similar GM models, the BCM is located under the driver’s side dashboard, to the left of the steering column. It’s a black plastic box with several large electrical connectors.
- Remove the Old Module: Carefully unplug the electrical connectors. They have locking tabs that need to be depressed. Once unplugged, the module can be unclipped or unbolted from its bracket.
- Install the New Module: Seat the replacement BCM into the mounting bracket and securely reconnect all electrical connectors. You’ll hear a click as they lock into place.
- Reconnect & Test: Reconnect the negative battery terminal. Start the vehicle and test all functions: lights, locks, windows, wipers, and HVAC to confirm the repair was successful.
Post-Installation Checks & Procedures
While our cloning service handles the primary programming, some systems may require a quick sync. After installing your 2003-2006 Tahoe BCM, be aware of the following:
- Airbag System Sync: If the airbag light remains on after installation, a professional scan tool is needed to perform the “Setup SDM Primary Key in BCM” procedure. This syncs the airbag system with the new BCM.
- Brake Pedal Position Relearn: On some models, a brake pedal position relearn might be necessary to ensure correct brake light and traction control operation.
Disclaimer: Procedures can vary slightly by model and year. Always consult a factory service manual or a qualified technician if you are unsure.
Verified Vehicle Compatibility
This module is a direct replacement for part number 15137393 and is interchangeable with several other part numbers, including 15116066, 15136225, and 15198116. It offers confirmed fitment for a wide range of GM vehicles:
AVALANCHE 2500 02-06 Body Control (BCM); (under steering column)
CADILLAC ESCALADE, ESV, EXT 03-06 Body Control (BCM); (under steering column)
CHEVROLET EXPRESS/GMC SAVANA VANS 04-07 Body Control (BCM); (center dash), w/commercial tradesman package (opt PRP)
CHEVROLET SILVERADO & GMC SIERRA 1500/2500/3500 PICKUPS 03-06 Body Control (BCM); (under steering column), Crew Cab models
CHEVROLET SILVERADO & GMC SIERRA CLASSIC 07 Body Control (BCM); classic style, (under steering column), Crew Cab models
HUMMER H2 04-07 Body Control (BCM); (LH dash)
CHEVROLET SUBURBAN 1500/2500 03-06 Body Control (BCM); (under steering column)
CHEVROLET TAHOE 03-06 Body Control (BCM); (under steering column)
GMC YUKON & YUKON XL 1500/2500 03-06 Body Control (BCM); (under steering column)
GMC SIERRA DENALI 03-06 & 07 (Classic) Body Control (BCM); (under steering column)
Frequently Asked Questions
Frequently Asked Questions
What is the cloning service and why do I need it?
Cloning is a process where we transfer the exact programming and security data from your old BCM to the replacement unit. This makes the new part plug-and-play, avoiding a costly and time-consuming programming session at a dealership.
Do I need to send my original BCM to you?
Yes, for the cloning service, you must send us your original module. We will perform the data transfer and ship both your original module and the ready-to-install replacement back to you.
Is there a core charge for this part?
No, there is no core charge. We always return your original module along with the programmed replacement, so you don’t have to worry about core returns or fees.
Will this fix my airbag light with code B1001?
A faulty BCM is a very common cause of a B1001 code. Replacing it often resolves the issue. However, if the light stays on after installation, the simple ‘Setup SDM Primary Key’ relearn procedure with a capable scan tool will be required to finalize the repair.
What tools do I need for installation?
Basic hand tools are all that’s typically required, such as a socket set or screwdriver to access the panel under the dashboard. No special electronic tools are needed for the physical installation.