What causes a SPN 4353 code?

SPN 4353 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 4353 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 4353 active.

How do I fix SPN 4353?

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 4353

Diffuser Heater

What it means

The Aftertreatment Control Module (ACM) detects an open circuit, short to ground, or short to battery in the DEF Diffuser Heater circuit. This heater prevents DEF from crystallizing/freezing at the injection point.