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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 3251 FMI 20 (ACM) Diesel Oxidation Catalyst Inlet Pressure – Not Plausible

DESCRIPTION:
Diesel oxidation catalyst (DOC) inlet pressure sensor – not plausible.

MONITORED PARAMETER:
Exhaust pressure

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:
Derate 25%

VERIFICATION:
Parked regen

PROBABLE CAUSES:
1. Inspect all connections upstream of the MCM – DPF outlet pressure sensor, ATD harness 10-pin connector, VIH 31-pin connetor, and MCM 120-pin connector.
2. DPF outlet pressure sensor.
3. DPF outlet pressure sensor tube.
4. Perform stationary regen.
5. Inspect DPF for oil, soot, or coolant contamination.

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