Not sure if I'm posting this in the right spot... My check engine light came on today leaving work. So I went back to the shop to use my snap on scanner to look up the code... I couldn't get the scanner to work. I kept saying it had no communication with my truck... I did notice that usually when I hook that scanner into an obd2 port it comes on but I was having to turn the scanner on manually... I assumed the scanner messed up somehow and The truck runs and sounds fine so I assumed it was a sensor of some kind so I went to oreillys to have them pull the code and ran into the same problem... It's a 2001 silverado 5.3 I put a newer 5.3 engine, cam, long tubes and mail order tune from Nelson in may and its been running fine no problems... Any ideas?

 

your cigarette lighter fuse is blown.

 

Yep. Its in the box under the hood

 

The aux power 20a fuse?

 

I thought there was one that says cig something... if not then that's the one i believe

 

I only see an aux 20a fuse no cig fuse and its good. My truck has three aux ports inside well I guess two aux and one cig in a row... My radar detector is in one phone charger in another and nothing in the third both of those work but I plugged my charger into the third and it didn't come on... But shouldn't all three be on the same fuse

 

Oops sorry I'm blind or one too many lol. found it it said "cigar" and yes it's blown... I never have had anything plugged into it no cig lighter nothing... Any ideas on why it blew?

 

probably ever 3 of 5 vehicles I tune has one that's blown lol. If you overload the ports they can draw too much current.

 

Ok thanks.. Ill replace it tomorrow and hook my scanner up to it to see why the check engine light is on

 

The third one is on that fuse. The other two ports are on another circuit.