B28 (Pressure sensor) : Implausible value (P0106)

B28 (Pressure sensor) : Implausible value (P0106)

If you are getting the error code P0106 on your vehicle's diagnostic system, it means that the pressure sensor (B28) is sending an implausible value to the engine control unit (ECU). This can cause various problems such as poor fuel economy, rough idle, engine hesitation, or even stalling. In this blog post, we will explain what the pressure sensor does, how it works, and what are the possible causes and solutions for this error code.

The pressure sensor (B28) is a device that measures the air pressure in the intake manifold. The intake manifold is the part of the engine that distributes the air-fuel mixture to the cylinders. The pressure sensor sends a voltage signal to the ECU, which uses it to calculate the air mass and adjust the fuel injection and ignition timing accordingly. The pressure sensor is also known as the manifold absolute pressure (MAP) sensor or the barometric pressure (BARO) sensor.

The pressure sensor (B28) can fail or malfunction due to various reasons, such as:

- A faulty or damaged sensor

- A loose or corroded electrical connector

- A vacuum leak in the intake manifold or hoses

- A clogged or dirty air filter

- A faulty ECU

To diagnose and fix the error code P0106, you will need a scan tool that can read and clear trouble codes, a multimeter that can measure voltage and resistance, and a vacuum pump that can apply and release pressure. Here are the steps to follow:

1. Check the wiring and connector of the pressure sensor. Look for any signs of damage, corrosion, or looseness. If you find any, repair or replace them as needed.

2. Check the voltage output of the pressure sensor. Connect the scan tool to the OBD-II port and turn on the ignition. Read the live data from the pressure sensor and compare it with the specifications in your vehicle's manual. The voltage should vary according to the atmospheric pressure and engine load. If the voltage is too high or too low, or does not change at all, the sensor is likely faulty and needs to be replaced.

3. Check the resistance of the pressure sensor. Turn off the ignition and disconnect the electrical connector from the sensor. Use the multimeter to measure the resistance between the terminals of the sensor and compare it with the specifications in your vehicle's manual. The resistance should be within a certain range depending on the temperature. If the resistance is out of range or infinite, the sensor is likely faulty and needs to be replaced.

4. Check for vacuum leaks in the intake manifold or hoses. Connect the vacuum pump to a hose that leads to the intake manifold and apply pressure. Observe if there is any drop in pressure or if you hear any hissing sound. If there is, there is a leak somewhere in the system that needs to be located and repaired.

5. Check the air filter and replace it if it is clogged or dirty.

6. Clear the trouble codes with the scan tool and test drive your vehicle to see if the error code comes back. If it does, you may have a faulty ECU that needs to be reprogrammed or replaced by a professional.

We hope this blog post has helped you understand what causes and how to fix the error code P0106 related to the pressure sensor (B28). If you have any questions or comments, please feel free to leave them below.