Q: Code P0128

asked by on

The Check Engine Light came on, and I had a diagnostic, which showed code P0128, which has to do with thermostat.

The code has to do with the thermostat not performing as specified, or the temperature sensor is not working correctly. You could first replace the thermostat, since it is the most common cause, and see if the code returns. If it returns, then replace the sensor. Or replace both components and be done with it. I recommend having a mechanic help you with the thermostat replacement, and/or temperature sensor replacement.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Q: Code P0128

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: The ASR light came on and the car went into limp mode - (the gas pedal work from the middle of pressing it).

Hi there. The ASR light is on for an issue with the throttle pedal position sensor located on the gas pedal. You may be able to reset the parameters without replacing any parts. Perform the following to reset the lights...

Q: What could cause check engine light and transmission service message to display on when weather is over 100 degrees?

Hi There, A number of sensors may become faulty in hot weather conditions which will ultimately cause the check engine light to come on. As the weather gets hotter, many sensors, fuel injectors and other components such as ignition coils...

Q: Code p0128

Code P0128 is engaged specifically when the engine itself does not get to operating temperature in a specified time period. The only things that can cause this problem is an issue with the thermostat, head temp sensor, and the coolant...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...