What causes a SPN 3475 code?

SPN 3475 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 3475 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3475 active.

How do I fix SPN 3475?

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 3475

SPN 3475 Aftertreatment 1 Regeneration Device Control Temperature

What it means

Indicates the exhaust temperature at the DPF inlet or during the dosing/regeneration event is not increasing or maintaining levels as commanded by the ECM.