CNG light blinking

[sthomas]

2009 Chevy Silverado CNG light stays blinking and engine light has come on. Have not had any codes read as of yet since just started this morning. Have been using the CNG mostly during the week without issues. Bought truck about 2 months ago and have not had any issues. Should I get codes read at AutoZone first and then take to mechanic or have mechanic do it?

[atikovi]

Spend $25 on a code scanner like https://www.ebay.com/itm/Autel-AutoL...cAAOSwB-1Y4Ag3 and get the codes first.