U0140Średni
Utrata komunikacji z BCM (moduł nadwozia)
Komunikacja sieciowa
Sprawdź szczegóły →U0040
ŚredniVehicle Communication Bus (VAN) B (+) – Low Voltage
OBD-II (EN): CAN Bus B (+) Low Voltage
Code U0040 indicates too low voltage on the VAN B communication bus. This can cause various electrical faults such as problems with locks, lighting, or air conditioning. Professional workshop diagnosis is recommended to avoid more serious issues.
Symptoms
Multiple dashboard warnings, malfunctions of door lock control, interior lighting, or air conditioning
Possible causes
Damaged wiring harness Corroded or loose connectors Blown bus power fuse Faulty power module Internal control module failure
Affected systems
Sieć VANModuły sterujące (ECU, BCM, etc.)Elektryka nadwozia
Related codes
U0100Krytyczny
Utrata komunikacji z ECM (sterownik silnika)
Komunikacja sieciowa
Sprawdź szczegóły →Does code U0040 require professional diagnostics?
The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.