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Detroit DD16 GHG14 (2014-16) Fault Code: SPN 4353 FMI 4 (ACM) Diffuser Heater Circuit Failed Low

Posted by PerDiezel Solutions on April 22, 2026

NOTE: This fault will turn on the MIL and CEL lamps.

NOTE: If code not active, release vehicle to customer.

PROBABLE CAUSES:
1. DEF metering unit diffuser heater.
2. DEF metering unit diffuser heater connector/harness.
3. DEF doser valve.

WARNING!