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Rough Idle At Cold Start — Possible Fault Codes

Found 2 fault codes associated with rough idle at cold start. Codes are sorted by severity — check STOP ENGINE codes first.

SPN 411 FMI 16

Exhaust Gas Recirculation (EGR) Differential Pressure

PACCAR MX-13 • Component: EGR Differential Pressure Sensor / EGR System • J1939

🟠 CHECK SOON

SPN 158 FMI 2

Engine Start-Up Aid Erratic

Detroit Diesel DD13 • Component: Engine Start-Up Aid / Intake Grid Heater • J1939

🔵 INFO

⚠️ Diagnostic Note: Symptoms can have multiple root causes. Always verify with a diagnostic scan tool before replacing parts. The fault codes listed above are possible matches for rough idle at cold start based on SAE J1939/J1587 fault code definitions and OEM service documentation.