What causes a SPN 7140 code?

SPN 7140 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 7140 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 7140 active.

How do I fix SPN 7140?

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 7140

Cummins fault code 7140

What it means

Condensation in the Crankcase - Data Valid but Above Normal Operational Range - Least Severe Level. This code indicates that the engine control module (ECM) has detected an accumulation of moisture/condensation in the crankcase oil system.