ObdII Code P0235: Causes, Diagnose, Symptoms & Fix

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How to Fix Error Code P0235?
Table of Contents

You will find that this code will malfunction in the turbocharger. There are many reasons why this can happen. Each situation will be different. However, if your check engine light is on, this could be a reason. Let us talk about error code P0235

Error Code P0235 Definition: Circuit Malfunction in Sensor A Turbocharger Boost

What Does Error Code P0235 Mean?

What Does Error Code P0235 Mean?

This will happen when the ECM or Engine Control Module detects that sensor A has an input malfunction. This happens when the ECM detects a boost of pressure. This will happen before the car even is turned on. This will happen when it is idling and when sitting in the ON position.

Causes of Error Code P0235

You will find that there are several reasons for which this error code may appear. You may have this appear for a few reasons that follow:

  1. The MAP or manifold pressure sensor and the turbo boost sensor are not having the same correlating readings. This happens when the engine is idling or off.
  2. There is a clog or contamination in turbo boost pressure sensor A.
  3. Sensor A is slowing to respond to other changing pressure.

Symptoms of Error Code P0235

There are a few things that will happen if you get this error code. The first thing that will appear is the Check Engine Light. The engine’s turbo boost may automatically turn off by the Engine Control Module. This means that the engine lacks power. You will not be able to obtain the same power you had before. The last thing you will notice is acceleration issues. This is going to happen when the boost sensors fail to register how much pressure there is.

You may also notice that your engine will have higher temperatures, and you will have more smoke from the exhaust. Your exhaust may smell, and you may notice noise coming from the engine. Your boost will show that it is out of range.

Diagnosing Error Code P0235

When you diagnose this, you are diagnosing why the Check Engine Light is on. You will then see that error code P0235 pop up.

  1. Scan the vehicle and determine what error codes appear. Make sure that only error code P0235 appears.
  2. Suppose you have the tool; clear all the codes. Take a test drive. If the code comes back, continue to step three.
  3. You will need to check how the boost pressure sensor is compared to the manifold pressure sensor.
  4. Make sure that there are no blockages in the senor port. Blockages can cause inaccurate readings. This could result in an error code that is not needed.
  5. Make sure that the pins are not corroded and the connectors are tight.

As you can see, there are a lot of items to consider when you are diagnosing this error code. If you do not know how to diagnose the error code even with our instructions, it never hurts to take it in. Taking it to a mechanic will be better for those who are not mechanically inclined. They can easily diagnose the problem for you.

Common Mistakes When Diagnosing

Many people do not realize that they need to follow simple steps to ensure they are not misdiagnosing the problem. All you need to do is check your boost pressure sensor hose. This hose may have kinks and/or obstructions. The next thing you do is make sure the connections are not loose. You want them secure. Also, ensure they are not leaking or kinked.

Is Error Code P0235 serious?

What Does Error Code P0235 Mean?

The intake will allow you to have more power. If the sensor is not working, the Engine Control Module will likely disable your turbo. This means that you will not have as much power as you used to. In return, your acceleration would be affected.

This error code should be taken care of as soon as you can. You do not want to let this go on too long. Make sure you are fixing the correct problem. Again, if you are not sure, your local mechanic can help you.

Repairing Error Code P0235

Repairing Error Code P0235

  1. The first thing you need to do is make sure your engine is running. Make sure that you do not have any misfires. Make sure you are only receiving one code.
  2. When your engine has cooled, inspect your hose clamps on your turbo. You will also check the throttle body to ensure it is tight.
  3. You will rock your turbo that sits on the exhaust to see if it is tightly in place.
  4. Look at your intake manifold. Ensure that there are no leaks.
  5. Take the actuating arm off the wastegate. You can operate your valve with your hand. You can determine if the button is sticking and dropping the boost power.
  6. Inspect your oil lines. You want from the engine to the turbo. Make sure there are no leaks in this system.
  7. Check your Boost Sensor. You want it to climb in voltage as you climb in RPMs. If the voltage does not climb with your RPMs, you have a bad sensor.

Repairing this is not the easiest thing. However, it is not hard. If you can look on the internet, you are in a good position.

Additional Comments

When you are getting this error code, make sure that you are checking the boost sensor. While there are many other issues that it could be, it is most often the boost sensor. When you get this error code, it is because the Engine Control Module cannot determine the exact cause.

Taking the time to determine the problem is important. You want your speed back, so this problem must be fixed. This article should help you better understand the error code and how to address it from now on.

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