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HomeAUTOMOTIVECode P0128: Causes, symptoms and how to fix it

Code P0128: Causes, symptoms and how to fix it

doYou have error code P0128 on your OBD 2 scanner? Of what it means code P0128 and how to fix it, we have explained everything you need to know in this post.

What does the code P0128 mean?

The P0128 is a diagnostic trouble code (DTCs) for malfunction in the coolant temperature of the coolant thermostat below the setting temperature of the thermostat. In simple terms, when the code appears, there is a problem with your car’s coolant thermostat.

What causes the P0128 code?

A leaking cooling system or thermostat is often the reason for the error code. The function of the thermostat is to prevent coolant from entering the radiator until the engine reaches the proper temperature.

This will ensure that the engine reaches optimum temperature within the set time to limit emissions. In a malfunctioning thermostat, the optimal temperature cannot be reached in time, and this causes the error code to appear.

Here are other possible causes of the error code:

  • Thermostat stuck open
  • If the engine coolant level is low
  • Malfunction in engine coolant temperature (ECT) sensor
  • Insufficient heating time

What are the symptoms of code P0128?

Aside from the check engine light coming on, here are other symptoms that can indicate when there is something wrong with the coolant thermostat:

  • When idling is higher than usual
  • If the temperature gauge remains low
  • Reduced fuel efficiency
  • Vehicle takes too long to warm up
  • Fluctuating engine temperature

How serious is the P0128 code?

This is not a serious error code that requires your immediate attention. However, there is a chance your engine could be damaged if you don’t get it soon. Let’s briefly explain how this happens. If the coolant doesn’t get hot enough, there won’t be enough heat to burn off the condensation, causing water to end up in the oil. Over time, this process can ruin your car’s engine.

Is it safe to drive with code P0128?

The code will illuminate the check engine light, but you can still drive your car. It will not cause any obstacles or sudden shutdown of the vehicle. The only problem you will notice is that the temperature gauge does not reach optimal levels. But, over time, this can damage your car’s engine and performance. Therefore, it is always better to have it checked by a professional.

How long can I drive with this problem?

As we mentioned earlier, since this is not a serious problem, you can drive your car indefinitely. It will not make your car stop suddenly. You can comfortably drive with this problem. However, in the long term, it can cause costly damage.

How can problem P0128 be fixed?

It is always better to seek the help of an expert to fix the problem. The professional might ask you to do the following replacements or repairs:

  • You may be asked to replace the thermostat.
  • Replace coolant temperature sensor or damaged sensor wiring and other components

How much does it cost to fix the P0128 problem?

It will cost between €400 and €800 solve this problem. will spend between €75 and €100 in labor and €600 to change damaged components.

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