What does the coolant thermostat code p0128 mean?

All our repairs are backed by our 12-month / 12,000-mile warranty. Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) The P0128 code means that the engine coolant is not getting warm enough, fast enough.

What is the diagnostic code for coolant thermostat?

P0128 is a diagnostic trouble code (DTC) for “Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)”. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.

When does an OBD-II trouble code p0128 occur?

The engine control module uses the Engine Coolant Temperature (ECT) sensor to determine whether or not to trigger a OBD-II P0128. When a trouble code P0128 exists by itself, usually a shop technician will suspect a fault engine coolant temperature sensor or stuck open thermostat.

What does p0172 in OBD-2 stand for?

A proper air-fuel ratio of about 14.7:1 is vital to obtain maximum engine power and fuel economy. P0172 indicates that there is too much gasoline being detected in the exhaust gases exiting the combustion chamber.

What causes the p0172 OBD-II trouble code?

What causes the P0172 code? A dirty mass air flow sensor overstating the amount of air entering the engine which may cause excessive fuel delivery A faulty fuel regulator, which may not be regulating the pressure of the going to the engine as it should

What does the code p0128 on an OBD mean?

A code P0128 may mean that one or more of the following has happened: Low engine coolant level. Leaking or stuck open thermostat (likely) Faulty cooling fan (running too much) Faulty coolant temperature (ECT) sensor.