What causes a SPN 808 code?

SPN 808 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 808 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 808 active.

How do I fix SPN 808?

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 808

J1939 SPN 808 — Engine Management parameter

What it means

Engine Management Parameter - Memory Error/Calibration Issue. This code indicates a checksum error or corruption within the ECM's internal parameter storage area.