SPN-3490 Aftertreatment purge air actuator

[Godsplan15]

(07-12-2020 )JimT Wrote:  Oh, and if I remember correctly this code will not go away/turn off the MIL unless you clear it directly. It may have only triggered briefly and gone inactive but will continue to display until manually cleared. That's what was happening with my truck.

You are correct. I replaced the purge valve mounted on the side of the engine and had the light cleared with a scan tool. 1 week later it’s back on. Smh