Lost Communication with Body Control Module
The PCM is unable to communicate with the body control module.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
This means that the main engine computer stopped talking to the body computer, which controls things like lights and locks. If there's a wiring problem, the body control module can't send its data, making systems that depend on it not work.
What the computer is actually seeing
The Powertrain Control Module (PCM) expects periodic signals from the Body Control Module (BCM) every 50-100 milliseconds. If it doesn't get these signals, it sets this code.
What a healthy reading looks like
PCM expects communication signals at a voltage of around 2.5V to 5V from the BCM for normal operation.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check battery voltage; it should be between 12.4V and 12.6V with the engine off. If below, charge or replace the battery.
- 2Inspect the wiring and connectors between the PCM and BCM. Look for frays, corrosion, or loose connections. Repair if necessary.
- 3Use a scan tool to check for other codes; if there are additional codes, address those first as they may indicate primary issues.
- 4Verify the BCM's operation by testing communication lines with a scan tool. If communication with other modules works but not with BCM, replace the BCM.
Common causes
- Faulty body control module (BCM)
- Wiring issues between PCM and BCM
- Corroded or loose connector pins
- Battery voltage issues (below 9 volts)
- Intermittent fault due to moisture ingress
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code?
Yes, but you might experience issues with electrical systems like lighting, locks, and more until it's fixed.
Will the issue come back after clearing the code?
It depends. If there's an underlying problem like a wiring issue, it may return. Otherwise, if it's a temporary glitch, clearing may hold until the next fault.
Why does this code appear with other codes?
Communication issues might stem from a single fault point affecting multiple modules, causing related codes to appear.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →