Detroit DD16 GHG14 (2014-16) Fault Code: SPN 625 FMI 9 (ACM) Heartbeat Missing
DESCRIPTION:
PT-CAN Heartbeat missing.
MONITORED PARAMETER:
CAN communication
TYPICAL ENABLING CONDITIONS:
Always enabled
MONITOR SEQUENCE:
None
EXECUTION FREQUENCY:
Always enabled
TYPICAL DURATION:
2 seconds
DASH LAMPS:
1. MIL
2. CEL
ENGINE REACTION:
None
VERIFICATION:
Ignition cycle
NOTE: If any engine computer modules have been programmed recently, it may cause this code to be inactive. Reset the codes, test drive, and see if they come back.
PROBABLE CAUSES:
1. Low battery voltage.
2. Wiring between the MCM 21-pin connector and the battery.
3. Wiring between the MCM 21-pin connector and the CPC #4 connector.
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