What does coolant temperature below thermostat mean?
What the P0128 code means. The P0128 code means that the engine coolant is not getting warm enough, fast enough. In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time.
Can low coolant cause P0128 code?
Low engine coolant can alter the engine running temperature enough to signal trouble code P0128. Your intake air temperature sensor, coolant temperature sensor and coolant fan could also signal this trouble code, so these should be inspected after you look over your thermostat and coolant level.
Why is my coolant temp so low?
Reasons the Temperature Gauge Reads Cold On most vehicles, the temperature gauge reads cold until the engine has run for a few minutes. With the thermostat stuck open, the engine can be overcooled, causing a low temperature reading. If this is the case, the thermostat may need to be replaced.
What temp is too low for coolant?
Engine coolant temperature has an ideal temperature for engine operation that is normally between 90-100 degrees Celcius or 194-212 Fahrenheit. At temperatures lower than this the control strategy must be modified to ensure stable combustion, generally at the expense of fuel economy and hydrocarbon emissions.
What causes coolant level to go below the thermostat?
Common causes include: – Faulty or sticky thermostat. – Thermostat seal is not sealing properly allowing coolant to bypass a closed thermostat. – Faulty engine coolant temperature (ECT) sensor. – Engine computer (PCM) software needs to be updated. – Low coolant level. – Radiator fan does not turn off.
What does p0128 mean on a GM thermostat?
In some GM cars when the code P0128 is set, the temperature gauge stops working and the radiator fans run constantly. Replacing the thermostat often solves the problem unless there are some other issues.
What should coolant temp be when car is cold?
If you have a scan tool with live data, check the engine temperature when the engine is cold, it should be close to outside temperature. Drive a car for 10 minutes and check the engine temperature again, it should be close to 180-220°F or 82-105°C. See the photo. Without a scan tool, the engine temperature sensor can be tested with an ohmmeter.
What causes code p0128 on a Chevy Trailblazer?
Common problems causing the code P0128 in different cars: In many GM cars and trucks (Chevrolet Trailblazer, Silverado, HHR and other models) the code P0128 is often caused by a sticking thermostat. In some GM cars when the code P0128 is set, the temperature gauge stops working and the radiator fans run constantly.