What causes a SPN 3824 code?

SPN 3824 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 3824 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3824 active.

How do I fix SPN 3824?

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 3824

J1939 SPN 3824 — Body/Chassis parameter

What it means

Aftertreatment 1 SCR Catalyst Reagent Tank Heater Control Unit - Special Instructions. This code indicates a communication or configuration mismatch regarding the DEF tank heater control.