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Check Engine Light PO128

13K views 4 replies 3 participants last post by  Chevrolet Customer Svc 
#1 ·
Hi All

My wife has a 09 Malibu 2LT and the check engine light has come one and is showing the trouble code PO128. I have replaced the coolant temperature sensor with an ac delco unit but code continues to come on. Temp gauge also does not work while light is on. The car has 66xxx miles. Hopefully someone can give me an idea what to try next. Is this something that would be covered under warranty? Any info would be greatly appreciated.
 
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