What does the code 172 mean for a 2005 GMC Canyon 3.5 engine? I've had the fuel injector, fuel pump, seat valve, and alternator replaced in a year. It has only 32,000 miles.
SOURCE: Check engine light on 2004 GMC Envoy. Had air
Code P0128 indicates a faulty thermostat, more than likely it is always in the open position causing the coolant to come up to operating temperature too slowly.
My suggestion is to find a different repair shop.
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