Detroit DD16 GHG14 (2014-16) Fault Code: SPN 3246 FMI 8 (ACM) Diesel Particulate Filter Outlet Temperature – Signal Spike

Posted by PerDiezel Solutions on April 23, 2026

NOTE: This fault indicates the aftertreatment control module (ACM) has detected a sudden temperature shift on the Diesel Particulate filter (DPF) outlet temperature sensor.

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

NOTE: If codes 3246-3 or 3246-4 active, fix those first.

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

WARNING!