Tired of Unpredictable Electrical Problems in Your GM Truck?
If you’re dealing with a 2003-2006 Chevrolet Avalanche 1500 that seems to have a mind of its own—with flickering lights, a dead A/C blower, or power locks that work one minute and not the next—you’re not alone. These frustrating and seemingly random issues often point to a single culprit: a failing Body Control Module (BCM). The BCM is the central command for your truck’s body electronics, and when it starts to go, it can create a cascade of annoying and potentially unsafe problems. This replacement BCM, part number 15137393, is the definitive, hassle-free solution to restore order and reliability to your vehicle.
A Technician’s Notebook: The Case of the Haunted Silverado
I remember a 2005 Silverado that came into my shop with a laundry list of complaints. The owner was convinced his truck was possessed. The radio would switch off, the dome light would stay on, and the driver’s side window wouldn’t roll down—but only on Tuesdays, he swore. A scan tool showed a dozen communication codes (U-codes) and a B1001 for the airbag system. Instead of chasing each problem individually, my experience pointed straight to the BCM. These modules are notorious for internal solder joint failures and grounding issues over time. We installed a VIN-programmed BCM, and like magic, every single ghost in his machine vanished. This single part saved him hundreds in diagnostic fees and countless headaches.
Is Your Avalanche Exhibiting These Electrical Gremlins?
A failing BCM doesn’t always trigger a check engine light, making it tricky to diagnose. Look for these common warning signs that point directly to a faulty module:
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ HVAC blower motor that won’t turn on, or only works on certain speeds.
- ✔ The security or anti-theft system acting up, potentially causing a no-start condition.
- ✔ Headlights, taillights, or interior lights behaving erratically.
- ✔ An illuminated airbag light, often accompanied by Diagnostic Trouble Code (DTC) B1001.
- ✔ Wipers that won’t park correctly or activate randomly.
Your Direct-Fit, Plug-and-Play Solution
The biggest hurdle in BCM replacement has always been the expensive and time-consuming programming required at a dealership. We eliminate that step entirely. We pre-program this module to your vehicle’s specific VIN before it ships, loading it with the latest GM software. This ensures it communicates perfectly with your truck’s other systems right out of the box. This is the ideal fix for any DIY mechanic or professional shop looking to save time and money. With this module, you are getting a reliable part that restores function and peace of mind, backed by a one-year warranty.
A Straightforward Guide to BCM Installation
You don’t need to be a master mechanic to perform this repair. The BCM is typically located under the driver’s side dashboard, near the steering column. The entire process usually takes less than 15 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes to ensure all modules have powered down.
- Locate the Old BCM: On most GM trucks of this era, you’ll find it attached to a bracket under the steering column. It will have several large multi-pin connectors.
- Swap the Module: Carefully release the locking tabs on the electrical connectors and unplug them. Remove the old BCM from its bracket and install the new one in its place.
- Reconnect and Power Up: Firmly plug the connectors into your new BCM. Reconnect the negative battery terminal.
- Verify the Repair: Start the vehicle and test all the functions that were previously malfunctioning—windows, locks, HVAC, lights, etc.
Will This Fit My Truck or SUV?
This BCM is a direct replacement for a wide range of General Motors vehicles. While this listing is for the 2003-2006 Avalanche 1500 BCM, it is also compatible with the following models. Please verify your part number (15137393) or one of the interchangeable numbers (e.g., 15116066, 15136225) for a guaranteed match.
SILVERADO 1500/2500/3500 PICKUP 03-07 (Classic) Crew Cab
SIERRA 1500/2500/3500 PICKUP 03-07 (Classic) Crew Cab
TAHOE 03-06
SUBURBAN 1500/2500 03-06
YUKON & YUKON XL 1500/2500 03-06
ESCALADE, ESV, EXT 03-06
HUMMER H2 03-07
EXPRESS & SAVANA VAN 04-07 (w/commercial tradesman package opt PRP)
Frequently Asked Questions
Do I need to get this BCM programmed by a dealer?
No. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for a plug-and-play installation, saving you a trip to the dealership and costly programming fees.
What tools are required for installation?
Typically, you will only need a basic socket set or nut driver (often 7mm or 10mm) to remove the lower dash panel and the BCM mounting bracket, along with a wrench to disconnect the battery. No special tools are needed.
My airbag light is on. Will this fix it?
If the airbag light is caused by a BCM-related code like B1001, this module will resolve the root cause. However, after installation, a ‘Setup SDM Primary Key in BCM’ procedure may be needed using a professional scan tool to sync the new BCM with the airbag system and turn off the light.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your old module without any hassle or need to return it.
What if I have other issues after installation?
On some models, a Brake Pedal Position (BPP) sensor relearn might be necessary. This is a simple procedure that can be done with a capable scan tool. Always consult a service manual or a qualified technician if you encounter unexpected behavior.