Volvo All Engines (2017 Emissions) Fault Code: U300001 PID: EMS Electronic Control Unit

Volvo All Engines (2017 Emissions) Fault Code: U300001 PID: EMS Electronic Control Unit

Battery voltage is monitored by the circuits within the Engine Control Module (ECM).

Conditions for diagnostic trouble code (DTC):
1) The voltage is more than 15V

Probable cause
1) Battery charger connected
2) Alternator
3) Damaged component, Engine Control Module