24 June, 2025Cummins ISM CM870 (2003-06) Fault Code: 223 PID: S085 SPN: 1265 FMI: 4/4 Centinel? oil control valve circuit – shorted low. Low signal voltage detected at Centinel? oil control valve circuit. This fault is logged when the ECM commands the Centinel? oil control valve ON and detects a lower signal voltage than expected at the output. Possible causes: 1)Short circuit to ground in the oil control valve or engine harness.2)Faulty ECM circuit3)Low internal resistance of Centinel? oil control valve. Possible repairs: 1)Replace the Centinel? oil control valve.2)Replace the ECM.3)Repair or replace the engine harness. Share on Facebook Opens in a new window. Tweet on Twitter Opens in a new window. Pin on Pinterest Opens in a new window. Back to blog