What causes a SPN 937 code?

SPN 937 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 937 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 937 active.

How do I fix SPN 937?

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 937

J1939 SPN 937 — Engine Management parameter

What it means

SPN 937 relates to an Engine Management Parameter error, typically indicating the ECM has detected an invalid data value or a configuration conflict within its internal parameter set.