What causes a SPN 806 code?

SPN 806 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 806 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 806 active.

How do I fix SPN 806?

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 806

J1939 SPN 806 — Engine Management parameter

What it means

SPN 806 indicates a 'Parameter Error.' The ECM has detected one or more programmed parameters are out of range, missing, or logically inconsistent with the engine hardware or other control modules.