I am getting these codes on my son's 2005 Pontiac Grandprix. P0128 P0300.... One is showing Thermostat but he said he replaced that last year... Any clue?

Audra Nagle

Asked by Oct 06, 2015 at 08:40 PM about the 2005 Pontiac Grand Prix Base

Question type: Maintenance & Repair

Trying to fix car to sell.

1 Answer

Tom Demyan

P0300 is a generic misfire code, P0128 can be many things, including the thermostat and coolant temp sensor. Look at this link.....http://www.obd-codes.com/p0128

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