P004B - OBD Trouble Code

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Always make sure that your PCM receives proper signals from the boost control solenoid as per the factory specifications. Now the question which would be there in your mind is “WHY?” The answer to this is that if you will not take care of this, then OBD Code P004B would set up. The “B” in the generic code is used for the circuit where the issue is located.

Want to learn a bit more about OBD code P004B? You have come to the right place as here you will find everything about this error code.

A nozzle vane is present in the turbocharger which keeps on opening as well as closing to regulate the volume of the exhaust gas which directly flows in the turbine. Now this controls the boost pressure. If the nozzle vane is moving towards the closing direction, then ultimately the pressure would increase. And if the vane is in opening direction, then the pressure would keep on decreasing.

What causes this problem with the Turbo/Supercharger Boost Control B Circuit Range Performance?

• Faults in the boost pressure/ turbocharger position sensor
• Failure with the turbocharger/supercharger
• Defective control solenoid can also cause this problem
• Faults with the Wiring can lead to problems
• Faulty PCM
• Vacuum leaks if the valve is vacuum controlled

1. Turbocharger/supercharger - Are there some faults in your turbocharger/supercharger? Don’t waste time and get them replaced or else P004B code can turn up.
2. Turbocharger position sensor - OBD Code P004B can appear because of faulty boost pressure/ turbocharger position sensor.
3. Boost control solenoid - Everything is fine with turbocharger/supercharger and still P004B code triggering? Then you must get your boost control solenoid checked.
4. Powertrain Control Module - There can be some issues with the PCM due to which you may see P004B code appearing over and over again. Visit us to buy best quality PCM online.

It is essential 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 P004B here:

Common Symptoms

• Check Engine Light will start illuminating
• Vehicle boost is over or under factory specifications
• Lack of power in the engine
• Rising up in the fuel consumption
• Unusual noises coming from the engine bay

Have a look at some ways with which you can correct the P004B code:

• Fix all vacuum leaks
• Replace the air filter if it is dirty
• The waste gate should be replaced
• Replace intercooler
• Carefully check if the connections on the intake as well as exhaust side of the turbo are fully airtight
• The boost sensor should be replaced if damaged
• Replace turbocharger/supercharger
• Repair or replace bad wiring in the circuit
• Replace PCM (Powertrain Control Module)

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of PCM, Solenoid, Supercharger and many more. Now all your problems would vanish within no time.

The main reason behind the flashing up of this code is that the PCM is not receiving signals from the boost control solenoid. The other reason can be that the signal provided from the boost pressure sensor may not be as per the factory specifications. The first and foremost thing which should be done is to check the circuit by testing the power as well as ground at the solenoid. Then you must carefully check the turbocharger/supercharger by removing the intake to check if there is any sort of damage or debris. If you find any sort of debris, then the best option would be to replace the unit. Then the pressure sensor should be tested. There must be three wires going through the position sensor: power, ground and signal.