P0047 - OBD Trouble Code

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A sudden increase in the fuel consumption and the engine performance along with occasional engine stalling and not starting with improper throttle response may be an indication of problem with the Boost Control Circuit hampering the engine’s performance, thus indicating OBD Code P0047.

If the ECU detects the out of range or low operation reading from the boost control circuit, it will immediately see it as a problem and the OBD Code P0047 will be stored in the PCM. This code is related to circuit A of the boost control solenoid and needs immediate attention as it immensely hampers the vehicle’s performance.

What causes problem with the Turbo/Super Charger Boost Control Solenoid Circuit Low?

• Boost pressure sensor faulty
• Damaged/Defective turbocharger boost control solenoid
• Boost control solenoid circuit wiring problems
• Boost sensor 5-volt reference circuit electrical wirings are faulty
• Failed Turbocharger

1. Turbocharger - Check for damaged turbochargers as they are constantly under high pressure and temperature and can wear down with time. Replace old turbochargers now!
2. Supercharger - Damaged supercharger will affect the air pressure supplied to an internal combustion engine, thus reducing engine performance. Replace faulty supercharger and parts immediately.
3. Diagnostic Tools - It is necessary to use high grade diagnostic tools for correction of the OBD error code which is detected. Buy form us now!
4. Engine Control Unit - Faulty ECU can read wrong information and can store the error, hampering the performance. Repair/replace it immediately.
5. Boost Control Solenoid - Faulty solenoid can be the cause of decreased air pressure and will affect the engine performance. Replace it now!
6. Boost Control Sensor - Faulty sensors will not be able to check air pressures and the ECU will not be able to calculate the exact amount to be mixed with fuel for maximum output. Replace faulty sensors now!
7. Electrical Connectors - Check for corroded, opened or shorted wiring and connectors and replace them immediately.
8. Spark Plugs - Common signs of faulty spark plugs include slow acceleration, loss of power, poor fuel economy, engine misfires, and difficulty starting the car. Without a spark, there would be no way for fuel to ignite in the combustion chamber. Replace them now!

Check engine soon lamp illumination is always the first indication of code P0047. This error may also lead to the following symptoms:

Common Symptoms

• Reduced engine performance
• Abnormal noises from the car’s hood
• Increase in engine and/or transmission temperature
• Black smoke emitting from the exhaust
• Fouled spark plugs
• Cylinder detonation due to hotter temperatures
• Lowered engine acceleration

• Check for leakages in the intercoolers and the intake systems as it is the main reason for error due to improper installations and deterioration with time. Replace all the affected parts.
• Replace faulty wirings and connectors as well as spark plugs.
• Clean the air cleaners and replace turbochargers that can be damaged or faulty.

A P0047 error code will be stored and a service/check engine soon lamp may be illuminated if the PCM detects a turbocharger/supercharger boost control solenoid circuit voltage signal that is low or detects an actual low boost pressure condition (under programmed conditions).

• Visually inspect all related wiring, connectors, components, and vacuum hoses. Repair/replace damaged, burnt, or disconnected parts as required.
• Inspect battery cable and battery post condition and rectify loose or corroded battery connectors and/or terminals before proceeding with further diagnosis.
• Note all stored codes and freeze frame data before clearing all codes from the system. Clearing the codes can bring turbocharger/supercharger boost control system to normal operations.
• Obtain specifications for the boost control solenoid, disconnect the solenoid electrical connector and use a digital volt/ohmmeter (DVOM) and check solenoid resistance levels. If solenoid resistance fails to comply with specs, replace it and retest the system.
• If solenoid resistance complies with the specs in the service manual, carefully apply battery voltage and a ground signal to the solenoid. If the solenoid makes a sound, it is likely functioning properly.
• Perform a circuit voltage and continuity test, if system wiring and connectors appear to be in proper working order.
• Test voltage at the boost control solenoid when it is commanded ON and compare your actual findings with manufacturer’s specifications.
• Disconnect the connector from the PCM and all related components to prevent possible damage, prior to testing for individual system circuit continuity.

Common Mistakes When Diagnosing OBD Code P0047

Always take assistance of a qualified technician to know the problem to this error. Never lose sight of the symptoms and never be in hurry to come to a conclusion as sometimes very small issue can lead to flashing of the OBD errors. Some of the major mistakes related to code P0047 are mentioned below.

• Replacement of the Turbochargers without checking the associated wirings and terminals
• Powertrain Control Module (PCM) replacement without inspecting the sensors and data transmission units
• Worn out and damaged wiring and connectors not checked and replaced