The check engine lights stays on and then goes off the next day on 2000 Pontiac Montana

The check engine light came on and stayed on all night. The following morning the light went out. ?????

Asked by for the 2000 Pontiac Montana
2 answers
Check owners manual for possible answer!
There are still trouble codes in the memory. Take it to a repair shop and get a computer diagnostic. They will be able to tell you what caused it.

Zee