P0242 Fault Code

P0242 OBD-II Trouble Code Short Description

Turbocharger/Supercharger Boost Sensor "B" Circuit High Input

What does trouble code P0242 mean?

The P0242 fault code refers to a problem with the turbocharger or supercharger boost sensor circuit. This means that the sensor is detecting an unusually high input in the circuit.

The cause of this issue could be a malfunctioning sensor, damaged wiring, or a problem with the turbocharger/supercharger itself. It can also be caused by a vacuum leak or a clogged air filter.

To resolve this issue, the sensor and circuit will need to be checked and tested for any faults or damage. Any damaged wiring or components will need to be repaired or replaced as necessary. If the issue is with the turbocharger/supercharger, it will need to be inspected and repaired or replaced as needed.

Ignoring this fault code can lead to decreased engine power and efficiency, as well as potential damage to the engine over time. Therefore, it's important to address this issue as soon as possible to avoid further damage.


What are the symptoms of the P0242 code?

Some common symptoms of the P0242 fault code on cars are:

  • Check Engine Light (CEL) illuminated on the dashboard
  • Reduced engine performance or engine stalling
  • Turbocharger or supercharger not engaging or making unusual noises
  • Idle surging or rough idling
  • Poor acceleration and throttle response
  • Decreased fuel efficiency

It is important to get the fault code diagnosed and repaired as soon as possible to prevent further damage to the engine and turbocharger/supercharger system.


What causes the P0242 code?

The P0242 fault code is triggered when there is a high input in the circuit of the turbocharger or supercharger boost sensor "B". This can be caused by various factors, including:

  1. Faulty sensor: The boost sensor may be faulty, causing a high input in the circuit.

  2. Loose connections: Loose connections or damaged wiring in the circuit can also cause the code to pop up.

  3. Vacuum leaks: Any leak in the intake system can cause the boost sensor to read a high input.

  4. Boost pressure issues: A malfunctioning turbocharger or supercharger can cause the fault code to appear if it is not producing the correct boost pressure.

  5. ECM/PCM failure: The Engine Control Module (ECM) or Powertrain Control Module (PCM) can also be responsible for the P0242 code if it is not functioning properly and is delivering false readings.

It is important to diagnose the root cause of the problem to ensure that it is fixed and prevent further damage to the vehicle.

Possible Solutions

How to fix P0242?

Possible causes of the P0242 fault code include a malfunctioning boost pressure sensor, damaged or corroded wiring and connectors, a vacuum leak in the intake system, a faulty wastegate or turbocharger, or a problem with the engine's computer. Here are some steps to fix the issue:

  1. Check the wiring and connectors for damage or corrosion and repair or replace as necessary.
  2. Inspect the vacuum hoses and intake system for leaks and repair or replace as necessary.
  3. Test the boost pressure sensor using a multimeter and replace it if it is faulty.
  4. Check the wastegate and turbocharger for proper function and replace if necessary.
  5. Clear the fault code using an OBD-II scanner and test drive the vehicle to ensure the code does not reappear.