12
UnclassifiedGeneral
What This Code Means
Engine or alternator shutdown; Generator set non-operational; Control prevents generator set from restarting; HIGH AC VOLTAGE message/symbol displayed
Possible Causes
- •High AC voltage fault condition active for the duration of the High AC Voltage Time Delay
- •One or more measured AC output voltages exceeded 130% of nominal for 1 second or 110% of nominal for 10 seconds
Suggested Actions
- 1Correct shutdown fault before restarting generator set
- 2Immediate repair by trained and experienced service personnel
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Get a diagnosis walkthrough for 12 on your specific Cummins unit — cited to the OEM manual, not a forum guess.
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