What causes a SPN 755 code?

SPN 755 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 755 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 755 active.

How do I fix SPN 755?

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 755

J1939 SPN 755 — Engine Management parameter

What it means

SPN 755 specifically identifies a fault in the Injector Solenoid Driver Circuit for Cylinder #11. This indicates the ECM has detected an electrical abnormality (open, short, or invalid current) in the circuit controlling fuel delivery for that specific cylinder.