U0042Vehicle area network (VAN) data bus B ( - ) - open circuit
Generic (OBD-II) interpretation in the TuningBot DTC database.
U · NetworkNetworkOBD2
What U0042 means
U0042
Vehicle area network (VAN) data bus B ( - ) - open circuit
Generic · network
Data confidence65%
The control module detected an interruption (open circuit) in the Vehicle area network (VAN) data bus B ( - ) circuit, so the expected electrical continuity was not present.
Symptoms
Multiple warning lamps possible
Functions of the affected module unavailable
Possible causes
CAN bus wiring fault (open, short, chafed harness)
Faulty control module loading the bus
Connector or terminal corrosion
Power supply or ground fault of a module
Recommended checks
Perform a full-module scan to map which modules communicate
Check CAN bus resistance and voltages at the diagnostic connector
Inspect wiring and connectors of the affected module
Check module power supply and grounds
Disconnect suspect modules one at a time only with a documented procedure
Generic SAE-standard code: same meaning on every make.
042
Specific fault index within the subsystem.
Frequently asked questions about U0042
What does U0042 mean?
Vehicle area network (VAN) data bus B ( - ) - open circuit. The control module detected an interruption (open circuit) in the Vehicle area network (VAN) data bus B ( - ) circuit, so the expected electrical continuity was not present.
Is U0042 generic or manufacturer-specific?
U0042 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove U0042 at file level?
Not guaranteed. Powertrain (P) codes can be reliably disabled in the ECU calibration, but body, chassis and network codes depend on the specific control unit and how the fault is implemented - some can be handled, some cannot. Ask for a quote and our engineers will check your file and tell you, free of charge, whether U0042 is removable in your case.
ItalianoIT
DeutschDE
EspañolES
PortuguêsPT
FrançaisFR
РусскийRU