P0106: MAP/Barometric Pressure Circuit Range/Performance Problem

One of the key ways mechanics diagnose vehicle problems is by using the error code system. You can use this system to do work on your car yourself. It does take some outside knowledge, however, to understand what each error code means. If you receive an OBD-II scanner error code P0106 problem, then there is a pressure problem in your car's intake manifold. Keep reading to learn everything you need to know about this issue.

DECODE YOUR CHECK ENGINE LIGHT

What the Error Means

Some questions, like “Why is my check engine light on?,” prompt further questions. Let’s start by answering one of these questions: “What does the code P0106 mean?” The manifold is the part of the car that feeds a mixture of air and fuel into the engine cylinders. The cylinders are where the power is generated by small explosions. It should go without saying that this is one of the most precise parts of a car and everything needs to be exactly right for the car to run smoothly. The manifold carefully manages the pressure of the air/fuel mixture. At the same time, the powertrain control module, or PCM, is responsible for maintaining the manifold with a series of sensors. If the P0106 error code has appeared, it is because the PCM detected a pressure discrepancy in the manifold. Your car will fall into one of three categories:

  • Has a Manifold Absolute Pressure Sensor, or MAP 
  • Has a Barometric Pressure Sensor, or BARO 
  • Has both a MAP and BARO 

This will determine which sensor detected the issue, but the same P0106 error code will be displayed no matter which type of sensor you have. 

P0106 Symptoms 

If the pressure in your manifold is off, you will likely experience some or all of these symptoms in addition to your check engine light being on: 

  • Rough engine performance 
  • Black emissions 
  • Bad fuel efficiency 
  • Engine cannot idle 

Sometimes a P0106 error code is caused by a faulty sensor. If this is the case, you will not experience any of these symptoms. 

The Potential Dangers of Ignoring it 

If there is something wrong with your manifold, you should not ignore the issue. It will likely lead to serious issues in the near future. It is even possible that you will completely destroy your engine, which is just about the most expensive automotive problem you can face. If one of these serious issues hits while the car is in motion, it may put you at serious risk. 

Solutions 

Wondering, “How do I fix trouble code P0106?” If so, then you should begin by checking your sensor. If you have both a BARO and MAP sensor, then it is unlikely that the sensors have failed, as they would have to both fail at the same time. Either way, you should use advanced scanning tools to see if the sensors are functional. Replacing a sensor is a relatively simple process, although the specific layout of your vehicle may make it difficult to access the sensor. You will also need to do in-depth research to determine the exact position of the sensor you need to replace. 

If there is nothing wrong with the sensor, you should turn your attention to the manifold. It should be obvious if there are any cracks in it. If not, then you need to check for obstructions on the inside. Working on a car’s manifold is difficult work and you may want to consider simply letting a mechanic take care of it. Additionally, it is hard to repair a manifold, meaning you will likely need to replace it if there are cracks or dents. 

If the manifold also seems to be perfectly fine, then the issue may be the PCM. It is very uncommon for a P0106 error to indicate a problem with the PCM, but it is not technically impossible. 

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