What causes a SPN 682 code?

SPN 682 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 682 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 682 active.

How do I fix SPN 682?

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 682

J1939 SPN 682 — Engine Management parameter

What it means

This code indicates a failure in the ECM's internal memory (EEPROM) specifically regarding the storage of engine management parameters. The ECM has detected that the data stored does not match the checksum or has been corrupted.