My check engine light has been coming on since I got the vehicle.....had it in several times to the dealer:

-Engine Missfire
-Replaced the thermostat
-Raplaced the ECU
-Check Engine - couldn't figure it out cause there was no code logged in (4th, 5th, 6th, and 7th time)

The darn thing keeps coming on and now they are telling me that GM posted a bulletin for the Cobalt SS/SC. A few are having problems with the check engine lights and it will continue to go on and off until they get the problem fixed - they claim their engineers are currently working on this....

I'll get the code when I go back today....

 

2005 or 2006???

 

thats weird keep us posted on what happens

 

It is on the 05's.....I'll get a copy of the bulletin and post it on here.

I'm going to find out from GM today on how they will handle the situation.

 

GM hasn't gotten back to me yet when they said they were going to.....

 

I had the same problem on my 05, they replaced the ecu, and wiring harness, my car has been fine ever since, there were some bugs with the 05s, since they were the first year produced.

 

My 05 has been perfect

 

u need to take it in to get it reprogramed........ Check Engine Light (MIL) Illuminated, Usually without Driveability Symptoms, DTCs P0128, P0604, P0326, P0420, P0717, P2431 Set on L61 Engine (Follow SI-If Necessary, Reprogram ECM with New Calibration #05-06-04-073 - (12/07/2005)