U0140 fault code: what it means

U0140: Lost communication with the body control module (BCM). Lights, locks and other body functions may act up.

Network (communication between modules) · Costly if missed

Usual causes, most likely first

1. BCM power, fuse or earth fault
2. damaged CAN wiring
3. water damage to the BCM
4. faulty BCM

What the repair usually costs

• Water damage dry-out (carpet lift, dry, sanitise)NZ$460–NZ$1,390 · A$500–A$1,480

Not sure what U0140 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.