Detroit DD15 GHG14 (2014-16) Fault Code: SPN 3226 FMI 21 (ACM) NOx Outlet Sensor Drift High
DESCRIPTION:
Outlet NOx sensor drifted high.
MONITORED PARAMETER:
Selective catalyst reduction (SCR) outlet NOx.
TYPICAL ENABLING CONDITIONS:
Always enabled
MONITOR SEQUENCE:
None
EXECUTION FREQUENCY:
Continuous when enabling conditions met.
TYPICAL DURATION:
Two seconds
DASH LAMPS:
MIL
ENGINE REACTION:
None
VERIFICATION:
Parked regeneration
NOTE: If any other EGR codes are active, fix those first.
PROBABLE CAUSES:
1. Check the aftertreatment system for leaks/damage.
2. Perform a high idle regeneration with the metering valve or dosing unit disconnected.
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