What causes a SPN 4886 code?

SPN 4886 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 4886 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 4886 active.

How do I fix SPN 4886?

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 4886

Cummins fault code 4886

What it means

EGR Differential Pressure - Data Valid but Above Normal Operating Range - Most Severe Level. This indicates a high flow rate through the EGR system or excessive backpressure in the exhaust.