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Detroit Diesel SPN 4364 FMI 18 indicates an issue with Exhaust Gas Recirculation (EGR) flow. This code appears when the EGR system is not operating within expected parameters and can contribute to emissions system faults.
Symptoms
- Check engine light illuminated
- Rough idle
- Reduced fuel efficiency
- Increased exhaust smoke
- Possible aftertreatment warnings
Cause
This fault is commonly triggered by a stuck EGR valve, clogged EGR cooler, faulty EGR differential pressure sensor, or restricted exhaust passages.
Can You Keep Driving?
Driving may be possible temporarily, but unresolved EGR flow issues can lead to additional emissions faults and eventual engine derate.
Recommended Action
Inspect the EGR valve and cooler for blockage or failure. Verify proper sensor readings and clean or replace faulty components as needed.
SPN 4364 FMI 18 indicates that Exhaust Gas Recirculation (EGR) flow is outside the expected operating range.
Common causes include a stuck EGR valve, clogged EGR cooler, faulty differential pressure sensor, or restricted exhaust passages.
Driving may be possible temporarily, but unresolved EGR faults can contribute to emissions issues and engine derate.
Yes. If EGR flow remains incorrect, the engine control module may reduce power to protect emissions components.
Inspect and clean the EGR valve and cooler, test related sensors, and verify proper exhaust flow before clearing the code.
Related codes
Need Immediate Help With This Fault Code?
If your engine is derating, losing power, or unable to complete regeneration, don’t risk further damage or costly downtime.
Use 4RoadService to locate mobile truck repair, dealer diagnostics, or emergency roadside assistance near your location.
Important Notice
The information provided above is for general informational purposes only and should not replace official OEM service procedures. Always consult the manufacturer’s service manual or a qualified diesel technician before performing repairs. Operating a vehicle with active fault codes may result in further damage.