What causes a SPN 103 code?

SPN 103 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 103 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 103 active.

How do I fix SPN 103?

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 103

SPN 103 Engine Turbocharger 1 Speed

What it means

This fault indicates that the electronic control module has detected a signal from the turbocharger speed sensor that is outside of the normal operating range or is invalid.