Restore Full Electrical Function to Your GM Truck or Van
Are you chasing electrical gremlins in your Silverado, Sierra, or Express van? Flickering lights, intermittent power windows, a security light that won’t turn off, or a vehicle that refuses to start can all point to one culprit: a failing Body Control Module (BCM). As the central hub for your vehicle’s body electronics, a faulty BCM can cause a cascade of frustrating and seemingly unrelated issues. This isn’t just an inconvenience; it can affect your vehicle’s safety and reliability.
This is a direct-fit replacement for your original BCM, and we take the biggest headache out of the repair. We program the module to your vehicle’s specific VIN before we ship it. This means it arrives ready for installation, loaded with the latest GM software updates to ensure optimal performance and correct known factory bugs. You get a reliable, long-term fix without the expensive trip to a dealership for programming.
Case Study: A Tricky Diagnosis
I remember a 2005 Sierra 2500 that came into my bay with a laundry list of complaints from the owner. The radio would turn on and off by itself, the driver’s side power lock was dead, and the dome light would stay on, draining the battery overnight. The owner had already replaced the battery and the alternator. After checking the grounds and finding no obvious wiring issues, I connected my scan tool. It couldn’t communicate with half the modules on the network. This communication breakdown is a classic sign. The problem wasn’t a dozen separate faults; it was one failing 2003 – 2007 GM BCM that was corrupting the data bus. A new, programmed module fixed every single issue at once.
Common Signs of a Failing BCM
- ✔ Erratic or non-functional power windows, door locks, and mirrors.
- ✔ Interior or exterior lights flickering, staying on, or not working at all.
- ✔ The security or anti-theft light stays illuminated, preventing the engine from starting.
- ✔ Horn sounding unexpectedly or not working when pressed.
- ✔ Wipers behaving erratically or not parking in the correct position.
- ✔ Diagnostic trouble codes (DTCs) related to communication errors (U-codes) or BCM internal faults.
- ✔ A/C and climate control functions not responding correctly.
A Straightforward Guide to Installation
Installing your new BCM is a manageable job for a confident DIYer. While the exact location varies slightly, it’s typically found under the driver’s side dashboard. Always consult a service manual for your specific model.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow all modules to power down completely.
- Locate the BCM: On most trucks (Silverado/Sierra), it’s under the steering column. On vans (Express/Savana), it’s often behind the center dash panel. You may need to remove a lower dash trim panel for access.
- Disconnect and Remove: Carefully unplug the electrical connectors. Most have a locking tab that needs to be depressed or lifted. Once disconnected, unbolt or unclip the old BCM from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed BCM in the same location and securely reconnect all electrical connectors. Ensure they click into place.
- Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position (without starting the engine) and test your lights, locks, windows, and other accessories to confirm they are working correctly.
Important Post-Installation Steps
After installing your new 2003 – 2007 GM BCM, your vehicle may require one or more relearn procedures for full system functionality. This is a normal part of the process.
- 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’ procedure. This syncs the new BCM with the airbag module.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration might be necessary to ensure brake lights and stability control systems function as designed.
Disclaimer: Vehicle systems vary. Always refer to a factory service manual or consult with a qualified technician if you are unsure about any step.
Will This Fit My GM Vehicle?
This module is a direct replacement for part numbers 15167329, 15194169, 15747545, 15136224, 15116065, 15198115, 15136876, and 10367689. It is guaranteed to fit the following models and options:
SIERRA/SILVERADO 1500/2500/3500 PICKUP (2007): Body Control (BCM); classic style (creased door skin), (under steering column), exc. Crew Cab (check transmission options for 2500/3500)
EXPRESS/SAVANA 1500/2500/3500 VAN (2003): Body Control (BCM); (center dash)
EXPRESS/SAVANA 1500/2500/3500 VAN (2004-2007): Body Control (BCM); (center dash), w/o commercial tradesman package
SSR (2003-2006): Body Control (BCM)
Why do you need my VIN?
Your VIN (Vehicle Identification Number) is essential. We use it to load the precise, factory-correct software and settings for your truck’s specific options, like the drivetrain, keyless entry, and lighting packages. This ensures the 2003 – 2007 GM BCM works correctly right out of the box.
Is this a plug-and-play part?
Yes, for the most part. Because we program it to your VIN, it eliminates the most difficult step. However, as noted above, some vehicles may require a simple relearn procedure for the airbag or brake pedal position sensor, which may require a scan tool.
Do I need to send my old BCM back?
No. We have a ‘No Core Charge’ policy. You can keep your old module, which saves you the time and expense of shipping a core back to us.
Will this fix my ‘Service 4WD’ light?
While a BCM can cause a wide range of issues, a ‘Service 4WD’ message is more commonly related to the Transfer Case Control Module (TCCM), the encoder motor, or the front axle actuator. It’s best to have the vehicle scanned for specific trouble codes before ordering.
How do I provide my VIN after purchase?
After you complete your purchase, you will receive an email with instructions on how to send us your VIN. We will not ship your order until we receive and validate your VIN to ensure perfect programming.