08 Cobalt with P0128 Code - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 4 (permalink) Old 12-18-2016, 09:53 AM Thread Starter
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08 Cobalt with P0128 Code

My 2008 Cobalt with appr 133K just threw P0128. Its 20 degrees outside.Will this code reset itself or must it be cleared? Opinion is that I did not allow it to warm up enough before I stared driving.

@Coby7 @MP81 @Parthros it normally doesnt get this cold in dallas
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post #2 of 4 (permalink) Old 12-18-2016, 01:32 PM
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I start my Cobalt and engage before the Xmas tree even clears and never had a problem. Thermostat failures happen even more in warm climate, it's just due for a little maintenance. It will clear itself after 3 start-ups if the problem doesn't persist but you can be sure you will need a thermostat change soon.

lol 20F isn't cold in fact it's damn near toasty, It was -23C ( -9F ) yesterday morning here and Cobalt purred.
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Last edited by Coby7; 12-18-2016 at 01:36 PM.
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post #3 of 4 (permalink) Old 12-18-2016, 04:13 PM
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Thanks Coby7
I did tell her about blocking off some of the radiator for a bit but to keep an very sharp eye on the temp.

BTW. This is the silver 08 LT that did the cross country late summer. "cigarette lighter fuse" and has the temp blend door shaft broken.
PS blend door coupling attachd via JBWeld. Waiting to mount cam & actuators and insert & JBWeld the machined AL adaptor into coupling.
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post #4 of 4 (permalink) Old 12-19-2016, 07:05 AM
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It's currently in the single digit degrees here in OK, and I'm not having any thermostat problems with mine. I'm sure Coby's right about it being time for some maintenance.


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