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Rough Idle — Possible Fault Codes
Found 7 fault codes associated with rough idle. Codes are sorted by severity — check STOP ENGINE codes first.
SPN 1322 FMI 31
Misfire Detected on Cylinder 6
Cummins ISX15 • Component: Cylinder 6 Injector / Valve Train • J1939
MID 128 SID 1 FMI 5
Injector Cylinder 1 Circuit
Cummins ISX15 • Component: Fuel Injector #1 Solenoid Circuit • J1587
MID 128 PSID 90 FMI 4
EGR Differential Pressure Sensor
Volvo D13 • Component: EGR Differential Pressure Sensor / EGR Valve • J1587
SPN 97 FMI 15
Water in Fuel Indicator
Volvo D13 • Component: Water-in-Fuel Sensor / Fuel Filter Assembly • J1939
SPN 105 FMI 3
Intake Manifold Temperature Sensor
Volvo D13 • Component: Intake Manifold Air Temperature (IAT) Sensor • J1939
SPN 108 FMI 3
Barometric Pressure Sensor Fault
Detroit Diesel DD13 • Component: Barometric Pressure Sensor / ECM (Integrated) • J1939
SPN 2659 FMI 7
Engine Speed Sensor Fault
PACCAR MX-13 • Component: Crankshaft Position Sensor / Engine Speed Sensing • J1939
⚠️ 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 based on SAE J1939/J1587 fault code definitions and OEM service documentation.