Volvo All Engines (2010 Emissions) Fault Code: SPN 158 FMI 18 PID: PSID 124 Keyswitch Battery Potential – Moderately Severe Level

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

Conditions for diagnostic trouble code (DTC):
1) Lower voltage than normal

Probable cause
1) Low battery voltage
2) Voltage supply
3) Ground connection