What causes a SPN 32 code?

SPN 32 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 32 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 32 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 32

J1939 SPN 32 — Engine parameter

What it means

SPN 32 refers to the Engine Crankcase Pressure. This fault indicates that the ECM is detecting pressure levels outside of the normal operating range or a circuit failure for the crankcase pressure sensor.