What causes a SPN 4844 code?

SPN 4844 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 4844 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 4844 active.

How do I fix SPN 4844?

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 4844

Cummins fault code 4844

What it means

Aftertreatment Fuel Injector 1 - Flow Rate Lower Than Expected. This indicates the doser valve is not delivering the required amount of fuel into the exhaust stream for an active DPF regeneration.