DESCRIPTION:
High side digital output circuit shorted low.

MONITORED PARAMETER:
High side digital output.

TYPICAL ENABLING CONDITIONS:
Always on

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
Two seconds

DASH LAMPS:
1. MIL
2. CEL

ENGINE REACTION:
None

VERIFICATION:
Key cycle

NOTE: The supply voltage circuit is networked internal of the Aftertreatment Control Module (ACM). This circuit supplies voltage to the Coolant Valve, DEF Post Run indicator (if equipped), and the Inlet NOx sensor. A short on any one of those circuits will set this fault code.

PROBABLE CAUSES:
1. Coolant valve connector/harness.
2. Failed ACM (Aftertreament Control Module).