Egr code help if possible

[Jamescj212]

Fault 1893 pid s324 spn3251
It says egr valve control circuit-abnormal update rate. No communication or invalid data transfer rate detected in the SAE J1939 data link btwn ecm and smart egr valve. Havent been able to regen for 5 wks, this is only active code and im looking for any thoughts or a startimg point if anybody has one. Thank you

[Jamescj212]

Nevermind. I worked my way through and found my mistake. We are golden eith this, now to drain diffs and compression test raditor.