DESCRIPTION:
Diesel Exhaust Fluid (DEF) system circuit low voltage signal or short to ground.

MONITORED PARAMETER:
DEF dosing unit voltage.

TYPICAL ENABLING CONDITIONS:
DEF dosing enabled then disabled.

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
50 seconds (max).

DASH LAMPS:
1. MIL
2. CEL

ENGINE REACTION:
Derate 25%

VERIFICATION:
Key cycle off five minutes after repair.

PROBABLE CAUSES:
1. DEF doser valve harness connector.
2. DEF metering unit failure.
3. Wiring between DEF doser valve harness and the ECM.