If it isn’t, there’s likely an issue with the thermostat itself. Check the Coolant TemperatureĪs a further step, the mechanic may check the coolant temperature at the thermostat housing to see if it’s responding correctly. If you pinch your hose, stay aware of the belted accessories and the fan. If it is easy to pinch the hose, the engine coolant will typically flow through it. Squeeze the Thermostat HoseĪ mechanic will check under the hood where your Cobalt’s radiator hose meets the thermostat housing.
If you feel little to no heat from the heater, it’s a good indication that the thermostat is the problem and not a wiring issue. Is the Heat Blowing Hot?Īn excellent way to at least get a good idea of whether it’s the thermostat or the sensor is to start the car cold and let it idle for ten minutes.
If there are codes related to the ECT, such as P0117 or P0118, they indicate that the Engine Coolant Temp Sensor is not performing correctly, which means you should start diagnosing P0128 in your Chevy Cobalt by taking a look at the ECT and wiring. If you feel the heater isn’t working well, that is the easiest way to tell the thermostat is stuck open. It can be challenging to tell this in a vehicle that doesn’t have a temperature gauge. ECT Sensor/ Wiring- If the thermostat itself isn’t the problem, it’ll be the wiring/sensor associated with Engine Coolant Temperature Sensor (ECT).Īn excellent way to tell if it’s a sensor issue or an issue with the thermostat is whether or not the Chevy Cobalt’s engine is running at its proper operating temperature.When this happens, the engine is “over-cooled” and never reaches the proper operating temperature. When a thermostat is stuck open, it allows coolant to flow through the engine at all times.
#Chevy coolant temperature sensor symptoms code#
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 Chevy Cobalt is usually a pretty easy thing to do since, 90% of the time, a stuck thermostat will cause the problem. This is because your Cobalt’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. Lack of heat– The most prominent symptom of the P0128 trouble code in the Chevy Cobalt is the lack of heat.Other symptoms may include poor engine performance and a decrease in fuel economy.
The most common symptom of a P0128 trouble code in a Chevy Cobalt is an illuminated malfunction indicator lamp (MIL).
#Chevy coolant temperature sensor symptoms driver#
When the ECM detects that the engine’s coolant is not reaching its proper operating temperature within a set timeframe, it will trigger this P0128 trouble code to alert the driver of a potential issue. Below Thermostat Regulating TempĪs part of your Cobalt’s computer system, your Engine Control Module (ECM) tracks various engine conditions, such as air temperature, engine speed and load, coolant temperature, etc.
P0128 indicates an issue with the engine’s coolant temperature not reaching the proper operating temperature within a certain amount of time. The coolant temp sensor is responsible for telling the Engine Control Module (ECM) the engine’s coolant temperature. The P0128 OBD-II trouble code is a generic powertrain diagnostic code (it has the same meaning for the Chevy Cobalt as any other vehicle). P0128 Definition: Coolant Temp – Below Thermostat Regulating Temp
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