P0685
ECM/PCM Power Relay Control Circuit Open
OBD-II
Electrical
What it means
Main relay control circuit open — can cause intermittent no-start.
Seeing P0685?
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P0560
System Voltage
ElectricalHigh
P0562
System Voltage Low
ElectricalHigh
P0563
System Voltage High
ElectricalHigh
P0571
Brake Switch A Circuit
ElectricalMedium
P0572
Brake Switch A Circuit Low
ElectricalMedium
P0573
Brake Switch A Circuit High
ElectricalMedium
P0600
Serial Communication Link
ElectricalHigh
P0601
Internal Control Module Memory Check Sum Error
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General reference only — what a code means can vary by make and model. Confirm with a qualified technician.