Help needed to assist my Mexican husband renew his Mexican passport

I  haven't been on this site for a long time, but remember several expats who helped a lot. My husband is very ill (not Covid) and I  booked flight to US. Discovered at airport that his Mexican passport had expired in 2016.

can someone please steer me to the right site to try to get an emergency passport? We live in Guanajuato.

Thank you very, very much for any help. I can't seem to get to site- at all.