In most cases, distilled water is enough to cool the motor even in the hottest summer months. P0128 Diagnostic Code Theory for Shops and Technicians When the P0128code is set in the Powertrain Computer, the engine is either taking too much time to warm up to the proper operating temperature—more than fifteen minutes, as measured by the Coolant Temperature Sensor—or the operating temperature is going below the 160—170º F range during vehicle operation. The thermostat is like a door. The good rule of thumb here is to get the Air Temperature at 100° F below the Coolant Temperature readings after warmup. If you think about it, it makes no sense why they even bothered making 2 versions, which is probably why they discontinued the 87C version. Car manufacturers require coolant for several reasons.
Hey guys, i got this code last week, but cleared it with my scanner and it hasn't come back. Ironic that this thread was bumped. In most cases, whenever the code P0128 is present, the thermostat is replaced. This is completely irrelevant to the ambient temperature from an engineering perspective. The thermostat sits in front of the engine. Third Step If the readings you get in the Coolant Temperature will not go beyond 160° — 170° F in the span of 15 minutes, then try to put your foot on the brake, shift to Drive and then press the throttle for around two to three minutes and see if the readings increase.
How serious is the P0128 code? My car just threw this error this morning. Start the engine and take note of how the Coolant Temperature values change with the heater turned off. Of course, it is advisable to drain and replenish the coolant when replacing the thermostat since most of the old coolant will flush out anyway once the main hose is removed to access the thermostat. Using tap water instead of distilled water will also cause problems in the long run. The role of the Error Code P0128 is to track the amount of time it takes for the engine to reach and maintain its right operating temperature. We buy all our scanners from them and think you should too! For more information about these error codes, check out our website. In very rare cases, there can be a problem with the supply voltage that is supplied by the Engine Control Module.
If the readings do go into the proper range, then the Thermostat is the most likely cause. Just look at your radiator top big hose on your driver side. Any resulting engine damage would take a period of years most likely, but the chance is there. Also, be sure to verify that the Intake Air Temperature Sensor readings are within reason, meaning that they are not too hot or too cold in relation to the outside air temperature and under-hood air temperature. You have to be careful because it is hot enough that you could be burned. You want your engine to get hot enough, period. Y'all have motivated me to do the work.
This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Generally, most Powertrain Management Systems require that the Engine Coolant Temperature Sensor rise above a reading of 160—170º F within fifteen minutes after engine startup. Once the motor is warm enough, the thermostat will open to allow the coolant to circulate while maintaining the required operating temperature. Our emissions expert has put together the following information about the P0128 code. . Fortunately, replacing thermostat is relatively easy. I just ordered the thermostat kit from Parts Geek.
However, there are other ways to fix this code as well. Enter the 5 character trouble codes in the search box and submit the search. The vast majority of the time, they would be right. YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. A good rule of thumb is that the Intake Air Temperature reading is usually about 100º F below the Coolant Temperature readings after warmup. That is where your thermostat sits in that black plastic housing.
Has the 87 degree been discontinued? You are right, nobody carries the 87C version anymore, not even Canadian dealers. How to Fix The obvious and easy solution is to replace the thermostat. P0128 Trouble Code Information for makes: P0128 P0128 Alfa Romeo P0128 Aston Martin P0128 P0128 P0128 Bentley P0128 Bugatti P0128 P0128 P0128 P0128 P0128 P0128 Ferrari P0128 Fiat P0128 P0128 P0128 P0128 P0128 P0128 P0128 Jeep P0128 Lamborghini P0128 Lancia P0128 Land Rover P0128 P0128 P0128 Maserati P0128 Maybach P0128 P0128 Mercedes P0128 P0128 P0128 P0128 Pagani P0128 P0128 Pontiac P0128 P0128 P0128 P0128 Saab P0128 Seat P0128 P0128 P0128 P0128 P0128 P0128 Categories Tags Post navigation. Although, we are told that thermostats on these cars usually get stuck in open position, it can get stuck in closed position and it's a matter of minutes before serious damage to engine occurs. However, every once in a while it is possible that the thermostat will not fix this code. These values will help determine if the vehicle was being driven at freeway or slower, in town driving speeds. Take off your air filter front housing for better view.
Here is the extra thermostat I have, it is actually sitting in front of me. For all intents and purposes, a P0128 code indicates the thermostat is stuck in the open condition. The only difference between the 2 is that your coolant runs 3 degrees Celsius hotter at the high end during normal operation. I'm beginning to wonder if the sensor itself is malfunctioning? This distinction will help you verify the code setting conditions. If the hose gets hot all of sudden like it should, then the next thing to check is the reading you are getting from the coolant temperature sensor. What repairs can fix the P0128 code? The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap.
If the thermostat sticks the the engine will overheat causing damage. This leads to the accumulation of rust and debris, which will eventually damage the thermostat. The purpose of the code is to point out a faulty thermostat. The engine coolant temperature does not reach to specified temperature even though the engine has run long enough. Generally speaking, the hose should be barely warm until the thermostat opens.