Fix Your Truck’s Electrical Headaches for Good
As a technician with over two decades of experience, I’ve seen countless GMT800 trucks like the Silverado, Sierra, and Tahoe roll into the shop with baffling electrical problems. The radio works one minute and is dead the next, the A/C blower quits on the hottest day of the year, or the security light causes a frustrating no-start condition. More often than not, the culprit is a failing Body Control Module (BCM). This module is the electronic brain for all your vehicle’s comfort and convenience features, and when it goes, it can feel like your truck is haunted.
This isn’t just a replacement part; it’s a permanent solution. We offer this high-quality Body Control Module, interchangeable with part number 15194170, fully programmed to your vehicle’s specific VIN. This means you can skip the expensive trip to the dealership for programming. It arrives at your door ready for a true plug-and-play installation, restoring full functionality and peace of mind to your daily driver or workhorse.
Is Your Silverado Showing These Classic BCM Failure Signs?
A faulty BCM can manifest in numerous ways. If you’re experiencing any of the following, there’s a strong chance your BCM is the root cause:
- ✔ Intermittent or non-functional power windows, door locks, or interior lights.
- ✔ HVAC system problems, such as a blower motor that won’t turn on or stays stuck on high.
- ✔ The security or anti-theft light is illuminated, sometimes preventing the engine from starting.
- ✔ An airbag warning light on the dash, often accompanied by diagnostic trouble codes (DTCs) like B1001.
- ✔ Wipers behaving erratically or not working at all.
- ✔ Communication errors with other modules on the data network.
A Technician’s Notebook: The Case of the Ghostly Gauges
A 2005 Silverado 1500 came in with a complaint that was driving the owner crazy: the gauges would randomly drop to zero while driving, the A/C would cut out, and the radio would shut off, all at the same time. He’d already replaced the battery and checked the main grounds. After hooking up my scan tool, I noticed multiple communication loss codes (U-codes) pointing to the BCM. A faulty BCM can disrupt the entire Class 2 data line, causing other modules to temporarily lose communication. We installed a VIN-programmed BCM, and within 10 minutes, all the ghostly electrical issues were gone. It’s a classic failure pattern for these trucks.
Your 5-Minute BCM Installation Guide
Replacing the 2003-2007 Silverado BCM is a job most DIYers can handle in their own driveway with basic tools. It’s one of the most straightforward module replacements you can do.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work. This prevents short circuits and helps reset the vehicle’s systems.
- Locate the BCM: On most Silverado, Sierra, Tahoe, and Suburban models, the BCM is located under the driver’s side of the dashboard, to the left of the steering column. It’s a black plastic box with several large multi-pin connectors.
- Swap the Module: Carefully unplug the electrical connectors. They have locking tabs that need to be depressed. Once unplugged, the old module can be unclipped or unbolted from its bracket. Simply install the new module in its place and securely reconnect all the connectors.
- Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all functions: windows, locks, wipers, lights, and the HVAC blower. Start the vehicle to ensure everything is operating correctly.
Post-Installation Note: In some cases, particularly if the airbag light was on, a procedure like ‘Setup SDM Primary Key in BCM’ may be required using a professional scan tool to sync the new BCM with the airbag system. This is not always necessary but is a possibility.
Verified Fitment for Your GM Truck, Van, or SUV
This module is a direct-fit replacement for a wide range of General Motors vehicles. Please verify your model and year below. This part is interchangeable with numbers: 15116066, 15136225, 15198116, 10383536, and others.
- Chevrolet Silverado 1500/2500/3500: 2003, 2004, 2005, 2006, 2007 (Classic)
- GMC Sierra 1500/2500/3500/Denali: 2003, 2004, 2005, 2006, 2007 (Classic)
- Chevrolet Tahoe / Suburban 1500 & 2500: 2003, 2004, 2005, 2006
- GMC Yukon / Yukon XL 1500 & 2500: 2003, 2004, 2005, 2006
- Cadillac Escalade, ESV, EXT: 2003, 2004, 2005, 2006
- Chevrolet Avalanche 1500 & 2500: 2003, 2004, 2005, 2006
- Hummer H2: 2003, 2004, 2005, 2006, 2007
- Chevrolet Express & GMC Savana Vans: 2004, 2005, 2006, 2007 (w/ tradesman package)
Frequently Asked Questions
Does this Body Control Module require programming?
No. This module comes pre-programmed to your vehicle’s VIN. It is ready to install right out of the box, saving you a trip to the dealership.
Where is the BCM located on my 2005 Silverado?
The BCM is typically found under the driver’s side dashboard, to the left of the steering column. It is a black plastic box with three or four large electrical connectors.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module without any penalty or need to return it.
My airbag light is on. Will this fix it?
A bad BCM can cause the airbag light to come on. Replacing it will likely solve the problem, but you may need a professional scan tool to perform an ‘SDM Key Relearn’ procedure to sync the modules and turn off the light after installation.
Will this fix my A/C that doesn’t work?
Yes, one of the most common symptoms of a failing 2003-2007 Silverado BCM is a non-functional HVAC system, especially the blower motor. This module is responsible for sending the signal to operate it.