#Coolant thermostat check engine light code

#Coolant thermostat check engine light code

This includes labor, typically around $100-$150, and the cost of the sensor itself, which can range from $5-$250.Mechanics Tips about the P0128 Code Code Definition Repair Costs for P0128įixing the P0128 engine code may cost roughly $150-$500 based on your car’s make and model, the repairs, labor rates, etc.įor instance, replacing the ECT sensor may cost $200-$400. If the error code persists even after the above repairs, the PCM could be the culprit and require replacement or repair. The engine coolant temperature sensor may also malfunction due to sensor wiring and connector issues, which the mechanic will check and fix accordingly. ➤ ECT sensor repairs/replacement : If the ECT sensor is faulty, they may replace it. This will ensure proper coolant performance, which will help the engine run at the correct temp. ➤ Coolant flush & refill : The mechanic will check the coolant system for old, contaminated, or insufficient coolant and do a coolant flush and refill. A new thermostat will regulat e coolant flow and maintain the engine at the optimal temperature.

➤ Thermostat repairs/replacement : I f you have a faulty thermostat, they may replace it. This will reset the check engine light.ĭepending on the cause of the P0128 code, your mechanic may perform these repairs: Once the mechanic finishes the repairs, they will clear the P0128 code f rom your vehicle’s ECM using a scan tool and ensure it doesn’t reappear. If it doesn’t, it may indicate a coolant temp sensor problem.Ħ. Ideally, the ohm reading should change with temperature. Next, using a multimeter, they may check if the coolant temperature sensor works properly. R usty or dirty coolant can cause the engine coolant thermostat to stick.ĥ. The mechanic may inspect the cooling system simultaneously, checking the wiring and circuitry. They’ll also check for coolant leaks or pressure issues, which m ay damage oxygen sensors.Ĥ. They’ll remove the radiator cap to check for low coolant levels. If your thermostat works fine, your mechanic may check the coolant level. You may have a faulty thermostat if the radiator hose doesn’t warm up (or takes too long).ģ. Ideally, the hose should heat up when the hot coolant passes through. To check your engine coolant thermostat, they will inspect the radiator hose once you start your car.If code P0128 is the only error present, your mechanic may check for an open thermostat since thermostat malfunctions usually cause DTC P0128. First, they will scan your vehicle with an OBD-II scanne r for error codes.Ģ. Here’s how your mechanic will diagnose a P0128:ġ. Cold weather conditions that prevent the engine from reaching it s normal operating temperature.A faulty intake air temperature sensor ( IAT sensor ).

A defective engine coolant temp senso r ( ECT sensor ).The coolant is a part of the car’s liquid cooling system, in addition to a water pump, radiator, cooling fan, thermostat, and hoses like the upper radiator hose.It removes excess heat and protects important moving components like the water pump, cylinder, head gasket, etc. A coolant is an antifreeze solution that regulates the engine’s operating temperature to prevent overheating.So a sticking or open thermostat keeps circulating the coolant even when it’s not needed, causing the engine to operate below its normal operating temperature.When the engine is warm enough, or the temperature gauge reaches the required operating temp, the thermostat lets the coolant flow through the radiator to maintain the engine temperature.You can find it inside the thermostat housing between the radiator and the engine. A thermostat regulates the engine temperature.Anything from irregular coolant thermostat temp (from faulty sensor readings) to low engine coolant levels can trigger a DTC P0128 code.