Cummins ISB CM850 (2003-06) Fault Code: 442 PID: 168 SPN: 168 FMI: 0 Battery 1 Voltage – Data Valid but Above Normal Operational Range – Moderately Severe Level. ECM supply voltage is above the maximum system voltage level.

Cummins ISB CM850 (2003-06) Fault Code: 442 PID: 168 SPN: 168 FMI: 0 Battery 1 Voltage – Data Valid but Above Normal Operational Range – Moderately Severe Level. ECM supply voltage is above the maximum system voltage level.

This fault code is logged when the ECM battery supply voltage exceed 36 volts. C

Possible causes :

1)Faulty alternator or regulator that is overcharging the system
2)Batteries connected in series instead of parallel
3)Incorrect jump-starting procedure.

Possible repairs:

1)Install the battery system correctly.
2)Repair or replace the alternator, regulator, and/or the OEM wiring to the alternator.

Categories Cumminz, ISB CM850 (2003-06) Tags 0, 06, 1, 168, 2003, 442, Above, Battery, But, CM850, Code, Cummins, Data, ECM, Fault, FMI, is, ISB, Level, Level., maximum, Moderately, Normal, Operational, PID, Range, Severe, SPN, Supply, System, the, Valid, Voltage

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