no crank no start. all lights work. batt is good

My best guess is starter.

My wife and I had the very same issue with our 2008 cobalt and I was able to trace it back to a break in the circuit board contained within the fuse box. The car would fail to start and if the start/run relay was moved or wiggled you could hear the fuel pump kick in.. to correct this issue (should this be the one u face) the pins for the start/run relays do not pass through the distribution panel into a plug. you must lift the fuse box and remove the plugs and inspect their condition as the start/run circuit must leave the box I'd imagine it does so, good idea to check plug and pins for moisture or corrosion. if they are without corrosion or damage and your vehicle is displaying the same no start/no crank until the relay is touched you must find the part number for your distribution panel (sticker with barcode on one of the sides somewhere) write it down and search your local scrap yard for a match ...I got mine out of an 09 and it's worked brilliantly for going on a year now.

Did you have to program fuse box?

No, just plug it in and off we went.......MAKE SURE IT IS THE SAME PART NUMBER AS YOURS!! Very important. That was some time ago too and it hasnt missed a beat.

Cobalt 2008 it will crank but won't start lights work some one said no compression in engine too ran good that night came back out then nothing ?

My 2010 Cobalt would start sometimes sometimes not. I had a new key cut at the dealer and was able to use the old key to program the new. Solved my problem. If you have a spare key try that.

hello ihave a cobalt 2010 my problem is when i turn this ignition switch to start position and release the starter no stop and the motor no run . i turn the switch to off for stopping starter . i checked relay crank . this ok , problem with bcm or ecm module or circuit crank on yellow wire is short to order voltage ? what it is ?

The starter will spin but not engage