This page covers the Detroit fault code SPN 5298 FMI 14, Selective Catalytic Reduction (SCR) Catalyst Abnormal Temperature Rise, on DD Platform engines. It documents the monitored parameters, DEF quality checks, and the SCR temperature sensor test.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD13, DD15 and DD16 (DD Platform) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Source | TruckFaultCodes.com |
| Year / Revision | 2017 (EPA10 / GHG14) |
| Pages | 2 |
| File size | 0.34 MB |
| Format | |
| Language | English |
SPN 5298 FMI 14 table of contents
- Fault description and 25% derate
- DEF concentration and contamination checks
- SCR temperature sensor connectors
- SCR temperature sensor resistance test
- Parked regeneration verification
The monitored parameters are SCR inlet temperature and SCR outlet temperature. Typical duration is 10 seconds, both MIL and CEL illuminate, the engine reaction is a 25% derate, and the code is verified with a parked regeneration.
Diagnosis first repairs any DEF quality (SPN 3364) or DOC/DPF temperature faults, then measures DEF concentration with a refractometer (target 28-36%), checks DEF for diesel or oil contamination with a test strip, inspects the SCR inlet and outlet temperature sensor connectors for damaged pins, and measures sensor resistance against the chart. A failed test ends with a parked regeneration and a call to the Detroit Customer Support Center.
Applicable truck models
This guide applies to Detroit DD13, DD15 and DD16 engines on EPA10 and GHG14 aftertreatment. The DEF Test Kit (W060589001900) and test strips (A0005850202) are called out by part number, and support is via 800-445-1980. See Detroit’s official website for more.
Who needs this SPN 5298 FMI 14 manual
Aftertreatment technicians tracing an SCR temperature complaint or a 25% derate on DD Series trucks use this document to confirm DEF quality and sensor health before disturbing the catalyst. The guide follows the factory decision-tree troubleshooting format.
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