What causes a SPN 3305 code?

SPN 3305 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 3305 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3305 active.

How do I fix SPN 3305?

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 3305

SPN 3305 Cummins Aftertreatment 1 Diesel Oxidation Catalyst Intake Gas Temperature

What it means

Indicates a high voltage or open circuit detected at the Diesel Oxidation Catalyst (DOC) intake temperature sensor circuit.