Cummins ISX CM870 (2003-06) Fault Code: 598 PID: P167 SPN: 167 FMI: 1/1 Electrical Charging System Voltage – Data Valid But Below Normal Operating Range – Most Severe Level. Very low battery voltage detected by the battery voltage monitor feature.
Make sure the ECM battery supply (+) is coming directly from the battery and not the starter.
Possible cause:
1)Undercharged batteries caused by a malfunctioning alternator or regulator.
Possible repairs:
1)Charge or replace the battery.
2)Repair or replace the alternator and/or OEM wiring to the alternator.
3)Repair or replace the OEM harness.
4)Repair the battery power connector.
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