Heavy truck
Heavy-truck SPN/FMI codes
Browse J1939 SPN/FMI diagnostic sheets for Class 7–8 heavy trucks.
25 codes
- SPN 100Engine oil pressure — out of range
- SPN 102Engine intake manifold #1 pressure (boost) — signal fault
- SPN 110Engine coolant temperature — signal or high temperature
- SPN 111Engine coolant level (surge-tank sensor path)
- SPN 111 FMI 1SPN 111 FMI 1 — Low level
- SPN 111 FMI 3SPN 111 FMI 3 — Voltage above normal / shorted high
- SPN 1121EBS brake switch
- SPN 1569Engine protection torque derate (messenger fault)
- SPN 157Injector metering rail pressure — data erratic, intermittent, or incorrect
- SPN 161Transmission input shaft speed — signal fault
- SPN 177Transmission oil temperature 1 — signal or high temperature
- SPN 190Engine speed (crank/ECM speed signal) fault
- SPN 191Transmission output shaft speed — signal fault
- SPN 3031Aftertreatment 1 DEF tank temperature 1 — signal fault
- SPN 3216Aftertreatment 1 intake NOx (SCR inlet / upstream)
- SPN 3226Aftertreatment 1 outlet NOx (SCR downstream / tail)
- SPN 3251DPF ash load — above threshold
- SPN 3597DEF/urea fluid quality — out of specification
- SPN 4354DEF/urea fluid level — low
- SPN 4364Aftertreatment 1 SCR conversion efficiency
- SPN 5246SCR operator inducement (end-stage speed/torque limits)
- SPN 639J1939 network #1 — primary vehicle network fault
- SPN 70Parking brake switch — signal fault
- SPN 789ABS wheel-speed sensor faults (J1939 SPN 789–794)
- SPN 91Accelerator pedal position (APP) signal fault