What causes a SPN 43 code?

SPN 43 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 43 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 43 active.

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 43

J1939 SPN 43 — Engine parameter

What it means

SPN 43 indicates an 'Engine Parameter' communication error, often referring to a lack of data or invalid data received via the J1939 CAN bus specifically relating to engine configuration or status.