What causes a SPN 4046 code?

SPN 4046 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 4046 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 4046 active.

How do I fix SPN 4046?

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 4046

Cummins fault code 4046

What it means

High Pressure Common Rail Fuel Pressure Relief Valve - Forced Engine Shutdown. The ECM detected that the fuel rail pressure exceeded the maximum limit or the relief valve has been tripped too many times.