Volvo All Engines (2010 Emissions) Fault Code: SPN 158 FMI 16 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) The voltage is more than 19?V

Probable cause
1) Battery charger connected
2) Alternator