Possible causes of OBD code P0128 Saab A code P0128 Saab may mean that one or more of the following has happened: Low engine coolant level Leaking or stuck open thermostat Faulty cooling fan (running too much) Faulty coolant temperature (ECT) sensor Faulty intake air temperature (IAT) sensor . Causes. Scan your Nissan to verify P0128 is the only code present. Diagnose code P0128 Thermostat Rationality. Scan your Honda to verify P0128 is the only code present. a. Possible Solutions. When a trouble code P0128 exists by itself, usually a shop technician will suspect a fault engine coolant temperature sensor or stuck open thermostat. Step 2: Electrical Problems: Is The Fan Stuck On? The system is under pressure. Possible Solutions. If other codes are present, they must be addressed first. P0128 Causes: Dodge Ram. Hard To Start troubleshooting P0128 Definition: Coolant temp is always low Explanation: The powertrain control module verifies that the engine is at proper operating temp. Possible Solutions. Possible Solutions. Most auto repairs shops charge between $75 and $150 per hour. P0128 Mercedes-Benz Engine Coolant Temperature Below Thermostat Regulating Temperature. Here are the most common causes of P0128: Thermostat Stuck Open– Far and away, the most typical cause for the P0128 code is going to be a thermostat that is stuck open. Scan your Chevrolet to verify P0128 is the only code present. The auto repair labor rates vary widely across the country, and even within the same city. P0128 Symptoms. P0128 is telling your fix sensor that your car’s coolant thermostat is operating below the regulating temperature. The Coolant Temperature Sensor (ECT) may be defective. Check coolant level and condition. Start by checking the "Possible Causes" listed above. Causes of DTC code P0128 Generic A code P0128 can be caused by one or more of the following problems: The thermostat may be stuck leaky. Symptoms Possible causes - Insufficient warm up time - Low engine coolant level - Leaking or stuck open thermostat - … Possible causes of OBD code P0128 Mini A code P0128 Mini may mean that one or more of the following has happened: Low engine coolant level Leaking or stuck open thermostat Faulty cooling fan (running too much) Faulty coolant temperature (ECT) sensor Faulty intake air temperature (IAT) sensor . Causes. Step 1. How do I fix code P0128 AUDI? Warning : Never open the cooling system when the engine is hot. Check the "Possible Causes" listed above. Here are the most common causes of P0128: Thermostat Stuck Open– Far and away, the most typical cause for the P0128 code is going to be a thermostat that is stuck open. There are two main causes for P0128: The most common cause is an engine coolant thermostat that has stuck open or is opening prematurely. Fixing P0128 is usually a pretty easy thing to do, since 90% of the time it’s going to be the thermostat that is throwing the code. P0128 Causes: Dodge Caravan. There is a low level of engine coolant. If other codes are present, they must be addressed first. Before getting into in-depth knowledge about the P0128 Code, first of all, know what does a P0128 means and how it works in your car. P0128 Possible Causes. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light is on diagnostic inspection. It is a Coolant Temperature below Thermostat Regulating Temperature meaning that the engine is basically cold. What causes the P0128 code? Check coolant level and condition. Here are the most common causes of P0128: Thermostat Stuck Open– Far and away, the most typical cause for the P0128 code is going to be a thermostat that is stuck open. Start by checking the "Possible Causes" listed above. When diagnosing for this code, make sure you verify both the electric and mechanical cooling fans are not stuck at “On” position, as this will cause the engine to run at very low operating temperature. Visually inspect the related wiring harness and connectors. If any ECT or AAT DTC are present, diagnose and repair those DTC before continuing with this test procedure. Most auto repairs shops charge between $75 and $150 per hour. If there is excessive rust and poor coolant condition this can clog up the cooling system or cause the thermostat to stick. Probable cause: 1. Thermostat defective 3. Low coolant level. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. If there is excessive rust and poor coolant condition this can clog up the cooling system or cause the thermostat to stick. If other codes are present, they must be addressed first. 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