Ok.. help out a retarded person here. How would one get any of these codes? They would come from something like an Autotap?

 

your check engine light will come on and then a diagnostic tool will have to be connected to your vehicle to extract the code which the error occured in..then they just basically tell you what u need...this can def come in handy to prevent yourself from gettin ripped off from a mechanic who assumes you know nothing about your car

Sweet post

 

Oh, my, god. Thats an absolutely incredible amount of sensors... Theres one error message up there I really do like seeing though...

P1258 Engine Coolant Over Temperature - Fuel Disabled -PCM

It won't let you drive it when its overheated... I like that...

 

Yet another (possibly stupid) question...will OnStar give you these codes when you run the diagnostic through that or will they just tell you if it's critical/non-critical?

 

On Star will only tell you if it is cricical or not, (as far as the last time I spoke with them). Also only a DTC (code) that is emissions related will set a SES light. Any of the (P) codes.

 

OK guys I split this off from the DTC list just so we could keep it clean and seperate for sticky purposes.

To answer a question. You can get the codes from a odbII code reader, autotap is one of them.

I dunno anything about onstar.