NOTE: Please see the step by step troubleshooting procedures for this specific code.
NOTE: If codes 5357-16 or 5357-18 present, fix those first.
PROBABLE CAUSES:
1. Perform a stationary regen.
2. SCR outlet NOx sensor.
Detroit DD16 GHG14 (2014-16) Fault Code: SPN 3238 FMI 2 (ACM) Selective Catalyst Reduction Outlet NOx Sensor Failure to Activate
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