DESCRIPTION:
Diesel exhaust fluid (DEF) coolant valve circuit failed high.

MONITORED PARAMETER:
DEF coolant valve.

TYPICAL ENABLING CONDITIONS:
DEF tank temperature less than 36°F and engine coolant temperature greater than 32°F.

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
Two seconds

DASH LAMPS:
1. MIL
2. CEL

ENGINE REACTION:
Derate 10%

VERIFICATION:
Output component test.

NOTE: If code not active, release vehicle to customer.

PROBABLE CAUSES:
1. DEF coolant valve harness connector.
2. Wiring between DEF coolant valve harness connector and the 120-pin ECM connection.