← Back to Detroit Diesel Fault Codes
Detroit Diesel SPN 4360 FMI 18 indicates that the SCR inducement system has been activated on the engine. This code appears on DD13, DD15, and DD16 engines and is the ECM’s way of enforcing compliance with emissions requirements by progressively limiting engine performance when the SCR system has been operating outside acceptable parameters for an extended period.
Symptoms
- Check engine light on
- SCR and DEF warning lights illuminated
- Significant engine derate active
- Vehicle speed may be limited
- Multiple SCR and NOx related codes likely present
- Engine power noticeably reduced
Cause
SCR inducement is triggered after the ECM has detected ongoing SCR system issues that have not been addressed within the allowed timeframe. Common causes include:
- Extended operation with low or empty DEF tank
- Prolonged SCR efficiency faults left unresolved
- Repeated DEF quality faults not corrected
- DEF dosing system failure over extended period
- Tampered or missing SCR components
- Accumulated fault counts exceeding ECM thresholds
Can You Keep Driving?
The engine is already in an active derate condition with this fault. Vehicle speed and power will be significantly restricted. This fault will not resolve on its own and requires diagnosis and repair by a qualified diesel technician. Continued operation in this condition risks further aftertreatment damage.
Recommended Action
This fault requires professional diagnosis as it indicates a history of unresolved SCR system issues rather than a single component failure. Have a technician perform a full aftertreatment system evaluation including DEF quality, dosing system, NOx sensors, and SCR catalyst condition. Simply clearing codes without repair will not resolve the inducement condition.
It means the ECM has activated the SCR inducement system after detecting prolonged SCR system non-compliance, resulting in a significant engine derate condition to enforce emissions requirements.
This fault is typically caused by extended operation with unresolved SCR system issues such as low DEF, poor DEF quality, or ongoing SCR efficiency faults that were not addressed within the ECM allowed timeframe.
The engine is already in active derate with this fault. Continued operation without repair will not improve the situation and risks further damage to the aftertreatment system.
Yes. SCR inducement is specifically designed to enforce a derate condition and will continue until the underlying SCR system issues are properly diagnosed and repaired.
The underlying SCR system faults must be diagnosed and repaired by a qualified technician. Clearing codes without fixing the root cause will result in the inducement condition returning. A full aftertreatment system evaluation is required.
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.