What causes a SPN 3365 code?

SPN 3365 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 3365 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3365 active.

How do I fix SPN 3365?

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 3365

J1939 SPN 3365 — Body/Chassis parameter

What it means

SCR DEF Tank Temperature. Specifically, this code indicates the ECM is receiving data that is out of range, erratic, or missing regarding the temperature of the Diesel Exhaust Fluid (DEF) in the reservoir.