U0003Controller area network (CAN) data bus: high speed bus(+) - open circuit
Generic (OBD-II) interpretation in the TuningBot DTC database.
U · NetworkNetworkOBD2
What U0003 means
U0003
Controller area network (CAN) data bus: high speed bus(+) - open circuit
Generic · network
Data confidence65%
The control module detected an interruption (open circuit) in the Controller area network (CAN) data bus: high speed bus(+) circuit, so the expected electrical continuity was not present.
Symptoms
Multiple systems may log communication codes
Possible loss of gauge or system functions
Possible causes
Bus wiring open or short circuit
Terminating resistor fault
A faulty node disturbing the bus
Connector corrosion
Recommended checks
Measure CAN-H/CAN-L voltages and bus resistance
Map communicating vs silent modules with a full scan
Generic SAE-standard code: same meaning on every make.
003
Specific fault index within the subsystem.
Frequently asked questions about U0003
What does U0003 mean?
Controller area network (CAN) data bus: high speed bus(+) - open circuit. The control module detected an interruption (open circuit) in the Controller area network (CAN) data bus: high speed bus(+) circuit, so the expected electrical continuity was not present.
Is U0003 generic or manufacturer-specific?
U0003 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove U0003 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 U0003 is removable in your case.
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