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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 3250 FMI 8 (ACM) Diesel Oxidation Catalyst Outlet Temperature – Signal Spike

DESCRIPTION:
This fault indicates the aftertreatment control module (ACM) has detected a sudden temperature shift on the diesel oxidation catalyst (DOC) outlet temperature sensor.

MONITORED PARAMETER:
DOC outlet temperature.

TYPICAL ENABLING CONDITIONS:
DOC outlet temperature greater than 150°C (302°F).

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
None

TYPICAL DURATION:
10 seconds

DASH LAMPS:
1. CEL
2. MIL

ENGINE REACTION:
None

VERIFICATION:
Low temp ATD check.

POSSIBLE CAUSES:
1. Wiring concern.
2. Poor terminal fit.
3. Corrosion.
4. Chaffing.

NOTE: If codes 3250-3 or 3250-4 active, fix those first.

PROBABLE CAUSES:
1. DOC outlet temperature sensor.
2. DOC outlet temperature sensor harness/connector.