Skip the auto shop - Our mechanics make house calls

P0239 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Malfunction

Check Engine Light

P0239 code definition

Turbocharger Boost Sensor B Circuit Malfunction

What the P0239 code means

P0239 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects an intake boost pressure sensor B input malfunction when compared to the manifold pressure sensor (MAP) when the engine is at idle; turbocharger boost should be zero.

What causes the P0239 code?

  • The turbo boost sensor B and the MAP sensor voltage input do not correlate the same reading with the engine at idle or when the key is first turned on and the engine is off.

  • The turbo boost pressure sensor B is contaminated or clogged.

  • The turbo boost pressure sensor B is slow to respond to changing pressure, most likely from age deterioration.

What are the symptoms of the P0239 code?

  • The Check Engine Light will be illuminated and the code will be set in memory.

  • The engine turbocharger boost pressure may be turned off by the ECM causing the engine to lack power on acceleration.

How does a mechanic diagnose the P0239 code?

  • Scans codes and documents the freeze frame data in order to verify the problem
  • Clears the codes to verify whether the concern comes back
  • Checks the operation of the boost pressure sensor compared to the MAP sensor
  • Checks the turbo boost sensor B for blockage of the sensor port
  • Checks the turbo boost sensor B connector for loose or corroded pins

Common mistakes when diagnosing the P0239 code?

Follow these simple guidelines to prevent misdiagnosis:

  • Check the boost pressure sensor hose for obstructions or kinks.

  • Verify the electrical connections to the sensor are secure and pressure hoses are not leaking or kinked.

How serious is the P0239 code?

  • The boost pressure in the intake can give you a lot of power. If the turbo boost sensor B is malfunctioning, then the ECM may disable the turbo boost and you would have a lack of power.

What repairs can fix the P0239 code?

  • Replacing the boost sensor if it is not giving the correct input pressure reading to the ECM

  • Repairing or replacing the hoses and connections to the turbo boost sensor if kinks or blockage of the lines are present

  • Repairing the wiring to the sensor or replacing the connection

Additional comments for consideration regarding the P0239 code

Code P0239 is triggered by the intake boost sensor B indicating a malfunction condition that the ECM cannot determine the true cause. The most common failure is the boost sensor in most cases.

Need help with a P0239 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance...


Related questions

Q: Truck wont start gives check engine light ran fine yesterday

Hi there. The Check Engine Light is a warning system that illuminates when an OBD-II error code is triggered. There are literally hundreds of possible reasons why the Check Engine will light up. In most cases, this is caused by...

Q: Passenger air bag 2 off

Hi, thanks for writing in. This light is designed to come on when the passenger side air bag is off when the passenger seat is empty. If this stays off when there is a passenger in the seat, this is...

Q: My 06 PT Cruiser will not start and the Check Engine Light is on. It turns but will not start, what does this mean?

Hello - first task is to determine what problem codes are set with the Check Engine Light. It is possible this is a problem with the wireless control module being "locked up". There is a Chrysler technical service bulletin (232597)...