Understand severity and derate rules for International DTC codes to prioritize repairs and ensure compliance. Our guide equips maintenance managers with templates and KPIs to reduce downtime by up to 50% and avoid costly penalties.
Achieve 98% compliance with automated severity and derate protocols.
Severity and derate rules classify International DTC codes based on their impact, from critical faults triggering immediate derates to noncritical issues. This guide, linked with critical vs noncritical codes, ensures prioritized responses.
Proper application of these rules prevents engine shutdowns, ensures FMCSA compliance, and optimizes fleet performance.
| Category | Code | Impact |
|---|---|---|
| Critical | SPN 110 FMI 15 | Engine Derate |
| Critical | SPN 4364 FMI 1 | Emissions Shutdown |
| Noncritical | SPN 102 FMI 2 | Performance Alert |
| Noncritical | SPN 168 FMI 2 | Minor Electrical |
Step-by-step process to classify and respond to DTCs, integrated with code structure analysis for precise diagnostics.
Read SPN/FMI using diagnostic tools or HVI app.
Determine criticality based on FMI and system impact.
Log actions for FMCSA audits and schedule repairs.
Address critical codes to avoid FMCSA violations, integrated with live DTC alert systems for rapid response.
Compliance adherence rate
Downtime reduction
Critical fault resolution
Audit-ready logging
Leverage HVI’s AI tools for severity classification, linked with datalogger setup for real-time monitoring.
Identify critical faults instantly.
Notify teams of derate risks.
Guide repair workflows.
Log for regulatory audits.
Answers for effective fault prioritization
Critical codes like SPN 110 FMI 15 (high coolant temp) or SPN 4364 FMI 1 (low DEF) trigger derates. See our DPF SCR playbook.
Use FMI values and system impact; critical codes often involve FMI 0, 1, 3, 4, or 15. Learn more in our critical vs noncritical guide.
Unresolved derates can lead to FMCSA violations; HVI’s automated logging ensures compliance. Check our datalogger guide for tracking.
Regular maintenance and real-time monitoring with HVI’s live alerts reduce derate risks by 30%.
Track fault frequency, derate occurrences, and resolution times using HVI’s analytics, aligned with our top 50 codes guide.
Complete DTC management for International equipment
Comprehensive diagnostics across major brands for seamless DTC management
Reduce downtime by 50% and ensure 98% compliance with HVI’s severity and derate rules for International fleets.
Prioritized responses
Regulatory adherence
AI-driven prioritization