U0140
Lost Communication with Body Control Module
System: Network
Severity: medium
What does U0140 mean?
The DTC U0140 (Lost Communication with Body Control Module) is a fault code stored by the ECU when it detects a lost comm BCM condition in the network subsystem. It is commonly seen on European and Asian vehicles using Bosch, Continental, Siemens or Denso ECUs.
Common causes of U0140
- Failed BCM
- CAN wiring to body
- BCM power supply
- Water damage in BCM
How to fix U0140
BCM often water-damaged in older cars. Check power supply + wiring.
Tuning approach with DaVinci Deluxe
For U0140, DaVinci Deluxe offers the following ECU map adjustments and software solutions:
- (BCM repair required — not ECU tuning territory)
Need to fix U0140 on your ECU?
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