Restore Your GM’s Electrical System with a Plug-and-Play BCM
Are you chasing down bizarre electrical problems in your GM truck or van? Flickering lights, power windows with a mind of their own, or a security light that won’t turn off are classic signs of a failing Body Control Module (BCM). As the nerve center for your vehicle’s body electronics, a faulty BCM can create a host of frustrating and hard-to-diagnose issues. I’ve spent years in the bay tracing wires, and more often than not, these gremlins lead straight back to a failing BCM. This isn’t just a part; it’s the solution to getting your vehicle’s comfort and convenience features working reliably again.
We take the guesswork and dealership hassle out of the repair. Simply provide your vehicle’s VIN at checkout, and we will program this BCM with the latest GM software specifically for your truck or van. It arrives at your door ready for installation, saving you a trip to the dealer and the high cost of programming fees. This is the most direct path to a successful, lasting repair for your 2003-2007 GM BCM.
Case Study: A Tricky Diagnosis
A customer brought in his ’05 Silverado 2500 with a battery that would die every two days. He’d already replaced the battery and alternator. We performed a parasitic draw test and found a significant amp draw with the key off. After pulling fuses one by one, the draw disappeared when we pulled the BCM fuse. The internal circuits of the original BCM were failing to go to ‘sleep,’ keeping other modules awake and draining the battery overnight. Installing a properly programmed BCM solved the issue instantly. It’s a common failure I’ve seen hundreds of times on these workhorse trucks.
Common Signs of a Failing BCM
If your vehicle is experiencing any of the following, a faulty BCM is the likely culprit. A scan tool may show communication codes like U0140, U0155, or various ‘B’ codes related to body functions.
- âś” Intermittent or non-working power windows, door locks, or mirrors.
- âś” Interior dome lights or exterior lights staying on or not working at all.
- âś” The security or anti-theft system light is on, or the vehicle won’t start.
- âś” Unexplained battery drain (parasitic draw) when the vehicle is off.
- âś” Horn honking randomly or not working when pressed.
- âś” Inaccurate gauge readings or warning lights on the instrument cluster.
A Straightforward Guide to Installation
For the confident DIYer or professional tech, replacing the 2003-2007 GM BCM is a manageable job. The location varies slightly between trucks and vans, but the process is similar.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before beginning.
- Locate the BCM: On Silverado and Sierra pickups, it’s typically found under the driver’s side of the dashboard, near the steering column. On Express and Savana vans, it’s located behind the center dash trim.
- Remove Connectors: Carefully unplug all electrical connectors from the old BCM. They have locking tabs that need to be depressed. Do not force them.
- Swap the Module: Unbolt or unclip the old BCM from its mounting bracket and remove it. Install the new, pre-programmed module in its place.
- Reconnect Everything: Plug all electrical connectors securely into the new BCM. Reconnect the negative battery terminal.
- Perform Post-Install Checks: Start the vehicle and test all functions: lights, locks, windows, radio, etc. Refer to the post-installation procedures below if you encounter any warning lights.
Important Post-Installation Notes
While this BCM comes programmed for your VIN, some vehicle systems may require a ‘handshake’ with the new module. This is normal. The most common procedures are:
- Airbag System Sync: If the airbag warning light is on after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ function. This syncs the new BCM with the airbag module.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be required to ensure brake lights and stability control function correctly.
Disclaimer: Always consult a factory service manual for procedures specific to your vehicle’s year and model.
Will This Fit My GM Vehicle?
This module is a direct replacement for part number 15198115 and interchanges with several other numbers, including 15167329, 15194169, 15747545, 15136224, 15116065, 15136876, and 10367689. It is guaranteed to fit the following models:
- 2003-2006 Chevrolet Silverado & GMC Sierra 1500/2500/3500 (exc. Crew Cab)
- 2007 Chevrolet Silverado & GMC Sierra Classic 1500/2500/3500 (exc. Crew Cab)
- 2003-2007 Chevrolet Express & GMC Savana 1500/2500/3500 Vans (some option exclusions apply)
- 2003-2006 Chevrolet SSR
This is a reliable solution for your 2003-2007 GM BCM replacement needs, backed by our expertise and pre-programming service. Plus, there is no core charge—you can keep your old part.
Frequently Asked Questions
Do I need to do any programming myself?
No. We program the module to your specific VIN before shipping. It arrives ready to be installed. In some cases, a minor relearn procedure may be needed post-installation for systems like the airbag, which any professional shop can perform.
What information do you need from me?
After you place your order, you must provide us with your 17-digit Vehicle Identification Number (VIN). This is essential for us to program the BCM correctly for your vehicle’s specific options.
Is this a new or used part?
This is a quality, tested replacement part, guaranteed to function correctly and programmed with the latest GM software for your vehicle.
What is a BCM and what does it do?
The Body Control Module (BCM) is a computer that controls many of your vehicle’s non-engine related functions. This includes power windows, power locks, interior and exterior lighting, the security system, and the wipers, among other things.
Why is my battery dying?
A common failure mode for a BCM is an internal short or fault that prevents it from entering a low-power ‘sleep mode’ after the vehicle is turned off. This creates a parasitic draw that can drain a healthy battery in a matter of days.
Do I have to send my old part back?
No, there is no core charge for this part. You can keep your original module.