Cold wheater sucks ... This morning it was minus 8 farenheit degrees. I put the key in the ignition, turned it and the car started very well; as fast as usual. So I let it idle for maybe 2 minutes until the coolant temp achieve maybe 45 farenheit degrees, then I put the car in reverse to get out of the parking.

Immediatly, the instrument panel write this (it was in french) : Reduced power mode; shutting ignition. Damn the car shutt off by itself ! After I try to turn the key, but nothing. I saw the check engine light comes ON. I wait a couple of minutes, then tried to start again. OK I get it started and the car runs as good as usual, except it took longer to get warmed.

Later I have been able to see what DTC it was (with the Aeroforce Interceptor) and it was the P0606 code. I got it reset with the Interceptor gauge and the car ran good today and this afternoon.

I was wondering what was the cause ? The service manual doesn't say a lot of things about it.

Any thoughts ? Maybe the throttle plate was stucked in slight ice ? My car was cover with some ice this morning ...

 

Well I can tell you it certainly wasn't ice on your throttle. If that was the case, that meant you were getting water from somewhere and you'd have more problems than just a code.

Sounds to me like a good old fasioned malfunction.

Did you check what the code you got meant?

 

It means Control Module Internal Performance.

 

The P0606 has been known to appear intermittently when battery voltage is low, possibly due to to leaving an accessory ON or abnormal parasitic drain. As long as you can clear the P0606, it isnt considered a real issue unless it resets or fails frequently. You should have your car checked out for excessive parasitic drain if your battery runs down over only a few days of sitting. There is an undocumented calibration update for the 2005 Cobalts that affects the P0603- perhaps it will reduce the occurances of the P0606 as well? (since they are both hardware related)

HTH
WopOnTour