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Detroit DD13 GHG14 (2014-16) Fault Code: SPN 3936 FMI 18 (ACM) Diesel Particulate Filter (DPF) Pressure – Out of Range Low

DESCRIPTION:
This fault code sets when the diesel oxidation catalyst (DOC) inlet pressure and Diesel Particulate filter (DPF) outlet pressure delta is below normal operating range for more than 10 seconds.

MONITORED PARAMETER:
DOC inlet pressure sensor and DPF outlet pressure sensor.

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
3. SEL

ENGINE REACTION:
Derate 25%

VERIFICATION:
Run engine between 1200 to 1800 rpm with a load less than 10%.

PROBABLE CAUSES:
1. Inspect entire exhaust system for leaks.
2. DOC inlet pressure sensor.
3. DOC outlet pressure sensor.
4. DOC inlet and/or outlet pressure sensor connector/harness.
5. DOC and/or DPF pressure sensor tubes leak, plugged, or kinked.
6. Perform stationary regen.

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