P0600
Serial Communication Link
OBD-II
Electrical
What it means
Internal ECM communication fault — check grounds and connectors before condemning the module.
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Check your car freeRelated codes
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
P0601
Internal Control Module Memory Check Sum Error
ElectricalHigh
P0602
Control Module Programming Error
ElectricalHigh
General reference only — what a code means can vary by make and model. Confirm with a qualified technician.