What causes a SPN 511 code?

SPN 511 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 511 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 511 active.

How do I fix SPN 511?

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 511

J1939 SPN 511 — Engine Management parameter

What it means

SPN 511 relates to the Auxiliary Idle/Accelerator Pedal source. It typically indicates the ECM is receiving invalid, inconsistent, or missing data regarding the requested engine speed or pedal position.