No CEL on start up [Archive] - GrandAmGT.com Forum

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Loki76
01-16-2013, 02:09 PM
Noticed this morning that the CEL doesn't light up on startup. All the other idiot lights work, they light up anyway. Would this be just a bad bulb?
It's my wife's car and I very rarely drive it so no idea how long it's been out..
2003
Grand Am
3.4 v6

MilzyZ34
01-16-2013, 02:37 PM
does the Service Engine Soon (SES) light come on at key ON engine OFF?

Loki76
01-16-2013, 03:04 PM
It's a Canadian model, the other service light does come on at start up. Nothing stays on though.

MilzyZ34
01-16-2013, 03:26 PM
ok, what lights do you have for malfunction indicator lamps? here the grand ams have Service Engine Soon and Service Vehicle Soon.

Of these lights, which ones come ON when key is ON, and engine is OFF?

Loki76
01-16-2013, 03:40 PM
The service engine doesn't light up, the service vehicle does light up. This is when all the lights light up when when you have the key to run but haven't started it yet.

MilzyZ34
01-16-2013, 08:19 PM
maybe a bad bulb. i would check voltage at the MIL pin on the instrument cluster connector with key On engine OFF. if you have voltage, probably a bad bulb or problem with the IC. if no voltage, have to backtrack from there, possibly bad fuse, damaged wire, or maybe pcm, but i doubt it's that.