When a thermostat is stuck open, it allows coolant to flow through the engine at all times. Thermostat Stuck Open– Far and away, the most typical cause for the P0128 code is a thermostat that is stuck open.Here are the most common causes of P0128: As a result, it consumes more gasoline to keep itself running correctly.įixing P0128 in the Pontiac G6 is usually a pretty easy thing to do since, 90% of the time, a stuck thermostat will cause the problem. This is because your G6’s engine is running at a cooler temperature than it should be. Slight Decrease in fuel economy– The P0128 code may also lead to a slight decrease in fuel economy.Service Engine Soon– Other than the heater not working, the only other symptom of P0128 is typically the service engine soon light itself. If you feel your car’s heater working better when sitting still and worse on the highway, that’s a dead giveaway for a thermostat that is stuck open. When the thermostat doesn’t bring the engine up to the proper operating temp, it means that the coolant going through the heater core isn’t as hot.
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