Is Your Vehicle Experiencing Strange Electrical Problems?
The Body Control Module, or BCM, is the central command center for your vehicle’s body electronics. It manages a vast array of functions that you use every day, including power windows, door locks, interior and exterior lighting, the security system, and even the horn. When the BCM starts to fail, it can create a cascade of bizarre and frustrating symptoms that can be difficult to diagnose, often mimicking other component failures. If your SS Caprice, Silverado, Sierra, or other compatible GM vehicle is acting possessed, a faulty BCM is a very likely culprit.
Diagnosing a Failing 2014-2017 Caprice BCM
A failing BCM doesn’t always result in a simple “it works or it doesn’t” scenario. Often, the failure is intermittent and presents as a collection of seemingly unrelated issues. You might notice your dome lights flickering, the radio turning on by itself, or the security light staying illuminated on the dash. In more severe cases, a complete communication breakdown between modules can prevent the engine from starting, leaving you stranded. Mechanics often refer to these as “ghosts in the machine,” and the BCM is frequently the source.
From the Diagnostic Bay
We once had a 2015 Sierra 1500 in the shop with a list of complaints that made no sense together. The driver’s side window wouldn’t go down, the passenger side turn signal blinked rapidly as if a bulb was out (it wasn’t), and the horn would honk randomly when locking the doors with the fob. The owner had already replaced the battery and checked fuses. After connecting our diagnostic scanner, we found multiple U-codes (communication errors) pointing to the BCM. By monitoring the data stream, we could see the BCM was sending corrupt information across the network. Our solution was a programmed replacement BCM, which resolved every single issue instantly. It’s a classic example of how one failing module can wreak havoc on the entire vehicle.
Common Symptoms of a Failing BCM
- ✔ Intermittent or non-functional power windows, locks, or mirrors.
- ✔ Erratic interior or exterior lighting behavior (flickering, staying on, or not working at all).
- ✔ Security system faults, anti-theft light illumination, or key fob malfunctions.
- ✔ Instrument cluster warning lights turning on randomly.
- ✔ Horn honking unexpectedly or not working when commanded.
- ✔ Communication errors with scan tools (U-codes).
- ✔ In some cases, a no-start or no-crank condition due to security system lockout.
The Perfect Plug-and-Play Solution
Dealerships will often charge a premium for a new BCM, followed by several hundred dollars in labor to install and program it to your vehicle. Our service eliminates that hassle and expense. We offer a straightforward programming service that makes this repair simple. You send us your original, faulty BCM. We then extract the vehicle-specific data—including the VIN, mileage, and optional equipment configuration—and flash it directly onto this replacement module. The BCM you receive back will be 100% plug-and-play. Simply install it, and your vehicle’s electronics will be restored to their proper function. No additional programming or calibration is required for most vehicles.
Installation & Post-Install Procedures
The BCM is typically located under the steering column or on the driver’s side firewall/dash area. While installation is straightforward, please note the following potential post-installation steps:
- 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 system.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration may be needed to ensure proper brake light and traction control operation.
This service is for part number 13594768 and is also a direct replacement for part numbers: 13594692, 13593214, 13580690, 13591519, and 13594769. Please verify your part number before ordering to ensure compatibility.
Frequently Asked Questions
What is this service and how does it work?
This is a programming service. You purchase this listing, ship your original BCM to us, and we transfer all of its critical data to this replacement BCM. We then ship the programmed replacement back to you, ready for installation.
Why do I need to send you my original BCM?
Your original BCM contains the unique VIN, security information, and electronic configuration for your specific vehicle. By cloning this data, we ensure the replacement module is a perfect electronic match, making it a true plug-and-play solution and avoiding the need for expensive dealership programming.
Is this module truly plug-and-play?
Yes, for over 99% of installations. Once we program the module with your vehicle’s data, you simply need to install it. In rare cases, as noted above, an airbag sync or brake pedal relearn may be required, which can be done with a high-end diagnostic tool.
What happens if my airbag light comes on after installation?
This indicates the new BCM needs to be electronically ‘introduced’ to the airbag module (SDM). A technician with a professional scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure to resolve this.
Where is the BCM located on my vehicle?
The location varies slightly by model. It’s generally found in the driver’s side cabin, either under the steering column, behind the lower dash panel, or on the LH firewall/hinge pillar area.
How long does the programming service take?
We typically complete the programming and ship your replacement BCM back out within 1-2 business days of receiving your original module.