P0239 - OBD Trouble Code

<<See All OBD Codes

The P0239 fault code can be defined as Turbocharger Boost Sensor B Circuit Malfunction

This fault code would start flashing up when the powertrain control module which is also known as engine control module in some cases would detect the intake boost pressure sensor B input malfunction in comparison to the manifold pressure sensor when the car engine is at idle, the turbocharger boost should be zero.

The boost pressure sensor would tell the engine control module that how much amount of boost is actually being created by the turbocharger. Now when an unusual signal would be detected from the boost pressure sensor by the powertrain control module, then the PCM would start flashing the P0239 trouble code.

What causes this problem with the Turbocharger Boost Sensor B Circuit Malfunction?

• There can be opened or shorted boost pressure sensor harness
• Poor electrical connection in the boost pressure sensor circuit
• The boost pressure sensor might be faulty
• Defects in the turbo/super charger engine over temperature
• Ignition misfire might exceed the calibrated threshold
• Some faults in the knock sensor

1. Boost pressure sensor - There can be some issues with the Boost pressure sensor due to which you may see P0239 code appearing over and over again. Visit us to buy best quality Boost pressure sensor online.
2. Turbocharger - A lot of issues can arise do to defective Turbocharger. Did you just see P0239 code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time. We have best turbo kit with us.
3. Supercharger - Faulty Supercharger can be the reason why P0239 code is flashing. Visit us to purchase top notch Supercharger Kit online.
4. Knock Sensor - It is an important auto part which needs full care. A faulty Knock Sensor can be a reason behind the flashing up of P0239 code.
5. Spark Plug - OBD Code P0239 can appear because of faulty Spark Plug. Visit us to solve your problem.
6. Intake Manifold Actuator - P0239 error code also relates to problems with the Intake Manifold Actuator. Find best Intake Manifold Actuator with us.
7. Boost Pressure Gauge - OBD Error Code P0239 can simply be due to faulty Boost Pressure Gauge. Replace old and damage components now!
8. Powertrain Control Module - If there is any fault detected in the Powertrain Control Module, it will flash OBD Code P0239. Replace faulty Powertrain Control Module now!
9. Engine Control Module - Faulty/damaged Engine Control Module can be a reason why P0239 code is flashing. Thus, it is important to replace it immediately.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0239 here:

Common Symptoms

• The code P0239 can start appearing which would mean that a problem can exist somewhere within this circuit preventing proper boost control. Additional codes in progression may be set regarding this malfunction, each of which pertains to a section of the circuit
• The engine may lack acceleration. The boost pressure gauge will indicate less than 9 pounds of boost or over 14 pounds of boost. Both are out of range
• There can be some unusual whining noises or rattling from the turbocharger or piping
• Engine knock sensor code may appear indicating detonation is occurring due to high cylinder head temperatures
• An overall lack of power may be exhibited by the car engine
• Smoke can start coming out from the exhaust
• There can be fouled spark plugs
• Engine temperature unusually high at cruise speeds
• Some hissing noises at the wastegate

Want to correct the Trouble Code P0239? Read these points mentioned below:

• You must confirm that the car engine is running properly with no misfiring plugs and no codes relating to a faulty knock sensor
• On a cold engine, the hose clamps at the turbo outlet should be properly inspected, intercooler and throttle body for tightness
• Attempt to rock the turbo on the exhaust flange to see if it is tight. Inspect the intake manifold for leaks of any kind including vacuum hoses
• The actuating arm from the wastegate should be removed. Operate the valve manually while looking for a sticking valve causing a drop-in boost
• Carefully locate a non-ported vacuum in the intake manifold and install a vacuum gauge. Start the engine. At an idle the engine must have between 16 to 22-inches of vacuum. If it has less than 16 the catalytic converter is bad and will not allow boost to build
• Rev the engine quickly to 5000 RPM and release the throttle while watching the vacuum gauge as it displays boost pressure. If boost pressure rises above 19-pounds of boost you have a bad wastegate. If boost fails to rise between 14 to 19-pounds of boost a problem exists with the turbo itself
• Shut the engine down and then it should be allowed to cool down. Remove the turbo outlet hose and look inside the turbo to see if the blades are striking the sides of the housing. Look for bent or missing blades or oil in the turbo. Spin the blades by hand and look for grinding or resistance indicating a faulty turbo
• The oil lines from the engine block should be inspected to the centre turbo bearing and the return line from the bearing to the oil pan for leaks
• The dial indicator should be installed on the outlet turbine nose and move the turbo shaft in and out. If there is over 0.003 of endplay the centre bearing is defected
• If the turbo passes these tests it is good. Use the service manual to test the boost sensor and harness using a volt/ohmmeter. Locate the 5-volt reference from the ECM to the sensor and confirm voltage. No voltage present is an open or short in the harness or bad ECM
• A proper reference signal should be properly located from the boost sensor to the engine control module and confirm a varying voltage as the RPM climbs. No voltage climb would indicate a poor sensor

Parts Avatar Canada is here to solve all your issues related to car parts. We have stocked a wide range of best priced cold air intake, intercooler, Electric Supercharger, air pressure gauge and a lot more to help you out in fixing your car.

The flow of diagnosis should begin with the most common turbo problems and working systematically down the line too the least likely.

To carry out the process of diagnosis, you must have a vacuum gauge and dial indicator. The steps which would help you out to easily diagnose this fault code are mentioned below as follows:

• Scan the code and document the freeze frame data so that you can verify the issue
• To verify whether the concern comes back, you should clear the codes
• The operation of the boost pressure sensor should be checked compared to the MAP sensor
• Inspect the turbo boost sensor for blockage of the sensor port
• Carefully inspect the turbo boost sensor connector for loose or corroded pins

Common Mistakes When Diagnosing The P0239 Code

• You can always inspect the boost pressure sensor hose for some obstructions or kinks
• Check that the connections to the sensor are secure and not leaking or kinked