What causes a SPN 380 code?

SPN 380 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a SPN 380 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 380 active.

How do I fix SPN 380?

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

J1939 SPN

SPN 380

J1939 SPN 380 — Fuel/Air parameter

What it means

SPN 380 indicates a generic fault within the intake air heater or pre-heater secondary circuit, affecting the fuel-to-air ratio during cold starts.