Generic (OBD-II) interpretation in the TuningBot DTC database.
U · NetworkNetworkOBD2
What U3543 means
U3543
High Voltage System Interlock Circuit O Low
Generic · network
Data confidence65%
The control module detected a fault associated with the High Voltage System Interlock Circuit O Low circuit or function; the stored code identifies the affected component rather than a single failure mode.
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.
543
Specific fault index within the subsystem.
Frequently asked questions about U3543
What does U3543 mean?
High Voltage System Interlock Circuit O Low. The control module detected a fault associated with the High Voltage System Interlock Circuit O Low circuit or function; the stored code identifies the affected component rather than a single failure mode.
Is U3543 generic or manufacturer-specific?
U3543 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove U3543 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 U3543 is removable in your case.
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