What causes a SPN 93 code?

SPN 93 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 93 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 93 active.

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 93

J1939 SPN 93 — Engine parameter

What it means

SPN 93 indicates an issue with the Engine Net Brake Torque signal. This is a calculated value based on engine load, friction, and fuel delivery, or measured via a torque sensor.