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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 5298 FMI 14 (ACM) Selective Catalytic Reduction Catalyst Abnormal Temperature Rise

NOTE: This code sets after SPN 5246/FMI 15 is present and the speed limit has been reduced to 55 mph.

DESCRIPTION:
Regulatory fault ignored – final action pending.

MONITORED PARAMETER:
SCR and DPF sensors.

TYPICAL ENABLING CONDITIONS:
Always enabled

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Always enabled

TYPICAL DURATION:
Two seconds

DASH LAMPS:
CEL

ENGINE REACTION:
40% derate, limited to 55 mph.

VERIFICATION:
1. Parked SCR efficiency test for extended SCR faults.
2. High idle regeneration for DPF and NOx faults

NOTE: If code 3364-xx present, fix that first.

PROBABLE CAUSES:
1. Check all DEF supply lines for damage or leaks.
2. DEF tank is contaminated with gas, diesel, water, etc…
3. SCR outlet and/or inlet temperature sensor.
4. SCR outlet and/or inlet temperature sensor connector/harness.

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