Body Control Module (BCM) - Invalid Serial Data Received
The Body Control Module (BCM) sees invalid serial data from a connected component.
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)
The BCM is not getting the correct data from another module, which could be due to a short, open circuit, or a faulty module.
What the computer is actually seeing
The BCM expects to receive serial data signals that fall within a certain voltage range (typically 0.5 to 4.5 volts) but is detecting signals that are too low, too high, or nonsensical (like constant zero or maximum voltage).
What a healthy reading looks like
Serial data signals should be between 0.5V to 4.5V; normal operation shows fluctuating signals corresponding with active components.
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.
- 1Inspect wiring and connectors for damage or corrosion. Fix any issues found.
- 2Use a scan tool to check for related codes in other modules. If multiple codes appear, proceed with further diagnostics.
- 3Check voltage at the BCM connector. It should read between 0.5V to 4.5V while communicating with connected components.
- 4Test each module connected to the BCM by inspecting their operation and connections. Replace faulty components as needed.
Common causes
- Faulty BCM
- Shorted or open wiring in the communication circuit
- Corroded or loose connectors
- Faulty sensor/module connected to the BCM
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It depends on the connected components that are malfunctioning. If critical systems are affected, avoid driving until repaired.
Will this code come back after resetting?
If the underlying issue isn't fixed, the code is likely to reappear.
Why might this code pair with other codes?
Codes often indicate multiple modules have communication issues, so check them as a group.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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