What causes a SPN 3466 code?

SPN 3466 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 3466 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3466 active.

How do I fix SPN 3466?

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 3466

SPN 3466 Aftertreatment 1 SCR Regeneration Device Control Circuit

What it means

Indicates an electrical circuit failure, such as an open circuit or short, in the SCR air supply control valve or regeneration device control loop.