Lost Communication with Body Control Module (BCM)
The PCM cannot communicate with the BCM.
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 main computer (PCM) is trying to contact the body control module but isn’t able to, which can affect features like power windows and interior lights.
What the computer is actually seeing
The PCM receives no response from the BCM for a specific period, usually longer than 5 seconds, after sending a request for data.
What a healthy reading looks like
The PCM expects to receive a data frame back from the BCM within a 5-second window that includes signals like window status or light status.
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 for basic issues: Inspect wiring harness and connectors for damage or corrosion, especially near the BCM.
- 2Verify power: Check for power and ground at the BCM connector. You should see battery voltage (around 12-14V) and a good ground (close to 0V resistance).
- 3Scan for additional codes: Use a scan tool to check for other codes including U0140, U0141, which may give more context.
- 4Perform a visual inspection of the BCM: Look for signs of physical damage, such as burns or melted plastic, and ensure it's properly mounted and secured.
- 5If previous checks are clear, test the BCM: If you have access to a known good BCM, swap it in to see if communication is restored.
Common causes
- Bad wiring or connector to the BCM
- Faulty body control module
- Corrosion or damaged pins in the connector
- Power supply issues to the BCM
- Software glitches in BCM or PCM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but could affect non-essential systems, so fix it soon.
Will this code come back after repair?
If the root cause is fixed, it shouldn't come back.
Why does this code pair with other U014?
They indicate communication issues, potentially caused by the same underlying fault.
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 →