Go to start my car today and noticed my boost gauge was at 0 then I saw my iat2s were like 6452 on the interceptor. Weird thing is that the interceptor reads vacuum but the boost gauge doesn't read it. One code is the map sensor, another cooling fan relay and the other ac pressure sensor. Radiator fans are also on non stop. Fuses are fine pretty sure its the map sensor giving a bad temp reading causing the fans to run all the time. Just don't know if that would cause the ac pressure sensor code. Gonna replace the map sensor tomorrow and report back. Just want other opinions in the mean time. I did do my brakes yesterday so I was romping on the car a bit.

 

FYI if you go into a parts store and ask for a map sensor for a cobalt they give you a barometric pressure sensor. Gonna head to the stealership tomorrow bc no one has the "air charge temperature sensor" which is what parts stores call our map.

Just a heads up, here's the correct map part numbers after my long search today.

Gm/Bosch- 90423637
AC delco- 213-3907
Duralast- su8254
Wells/airtex- 5s6754

 

Are all those sensors in close proximity of each other, wiring harness could have been damaged, might be worth checking...

 

I went over everything, harness looks fine all connectors are tight, fuses ok. If its not the map possibly could be a bad relay maybe. Will report back once I change out the map.

 

Well I replaced the map and problem still persisted. I emailed tennpenn83 bc I did a search online and he had the same exact 3 codes after he did a engine build. Convinced me that it was most likely a problem with the harness. He wound up replacing his whole harness and I was not about to do the same. Spent a couple hours researching wiring diagrams to get ready to troubleshoot this stuff then went out and looked at my wiring harness for awhile. It wound up being this connector. It wasn't pushed in all the way. Thanks tennpenn And ccrunner I owe you one

 

I just saw this thread. Glad you got it figured out. I had underlying issues with mine other than that connector you pictured, which had to do with a shoddy install of a wideband through the A/C line (from a so-called reputable tuner on these boards) that shorted out some wiring. So my wiring harness still needed replaced anyway. I have no issues now.

 

Wow i had exactly same issue, thanks man

 

No problem. I like to document problems and solutions bc it helps people out. When people title threads "help my car doesn't work" it makes searching useless.