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, Purge-in-Process 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 (Aftertreatment Control Module).