Detroit DD16 GHG14 (2014-16) Fault Code: SPN 3246 FMI 3 (ACM) Diesel Particulate Filter Outlet Temperature Sensor Circuit Failed High

Posted by PerDiezel Solutions on April 23, 2026

NOTE: Please see the step by step troubleshooting procedures for this specific code.

NOTE: If codes 3246-3, 3242-3, 3250-3 or 1172-3 active, fix those first.

PROBABLE CAUSES:
1. Wiring between the turbocharger compressor inlet temperature and the 120-pin MCM connection.
2. DPF outlet temperature sensor.
3. DPF outlet temperature sensor connector/harness.

WARNING!