What does the P0047 fault code mean?
The P0047 fault code, applicable to all car manufacturers, means “Turbocharger/Supercharger Boost Control A Circuit Low“.
Background Information: A turbocharger uses the inertial force of exhaust gases from the engine to drive a turbine, which in turn drives a coaxial impeller, pressurizing the intake air and thus increasing the car’s power. A supercharger is an air compressor used to increase the intake air of an internal combustion engine. More intake air provides the engine with more oxygen, allowing the control module to deliver more fuel, thereby increasing output power. The turbocharger/supercharger boost controller’s function is to, when the boost pressure reaches a set value, use air pressure to push a wastegate actuator (pneumatic mechanical type) to redirect some exhaust gases around the turbine, thereby reducing the turbine speed and controlling the boost level. This fault code indicates that the voltage in the turbocharger/supercharger boost control circuit is below the calibrated minimum value.
Symptoms of the P0047 error code:
- Loss of engine power
- Limping mode
- Unstable engine operation
- Increased fuel consumption
- Check engine light illumination
Important! Even if the symptoms temporarily disappear, the error may reappear under the next load.
The main causes of the P0047 error code:
- Open or short circuit in the turbo control valve wiring
- Faulty solenoid valve (ESP) itself
- Engine control unit (ECU) problem
- Oxidation or damage to the connector
- Blown fuse or relay shock
How to diagnose the P0047 error code?
Step 1: Connect an OBD2 scanner and read the error code P0047.
Step 2: Check for other errors, especially those related to the pressurization system or power supply.
Step 3: Visually inspect the wiring and connectors leading to the turbo control solenoid valve.
Step 4: Test the valve with a multimeter; an oscilloscope is also acceptable if available.
Step 5: If necessary, replace the defective part and clear the error code to see if it reappears.
Tools needed: OBD2 scanner, multimeter, oscilloscope (if possible), a set of hand tools (screwdriver, key), contact cleaner
How to resolve the P0047 error code? (Solutions to the Problem)
Simple Troubleshooting:
- Clean oxides from contacts and connectors.
- Replace blown fuses or relays.
- Clean error codes and test drive.
- Reconnect chips and circuits to the valve.
In-depth Diagnosis and Repair:
- Replace faulty boost control valve.
- Repair damaged wiring.
- Flash or replace ECU (rare cases).
- Illustrations and Checkpoint Diagnosis
Troubleshooting through Symptoms
| Symptoms | Possible Solutions |
|---|---|
| Power outage | Check valves, restore boost pressure |
| Check engine light illuminated | Circuit diagnosis, code clearing, valve replacement |
| Engine emergency mode | Restore circuit signal, replace faulty unit |
| Unstable turbo operation | Valve replacement or ECU adjustment |
P0047 Error Code FAQ
Can I drive with error code P0047?
Undesirable. This error indicates a fault in the turbo control system, which can lead to reduced power, excessive fuel consumption, and turbo failure.
Can a P0047 error occur due to poor connector contact?
Yes, oxidation or loose contact in the boost control valve connector often causes this error.
Will resetting the error with a scanner help?
The error may disappear, but it will reappear while the vehicle is running if the cause is not eliminated.
Can I replace the boost control valve myself?
Yes, if you have the experience and tools. Choosing a valve with similar performance and paying attention to the connections is very important.
Is P0047 a harmful error code for the engine?
Yes, prolonged operation and malfunction can lead to turbocharger damage and shortened engine life.
Error Code P0047 in Different Vehicles:
- Volkswagen/Audi P0047: P0047 error most commonly occurs in diesel TDI engines. The cause is usually a failed turbo control solenoid valve.
- Ford P0047: For models equipped with the Duratorq diesel engine, the error may occur due to damaged wiring near the turbocharger. It often occurs in humid climates.
- Mercedes-Benz P0047: A common cause is connector failure and oxidation. If pneumatic control is used, it may also cause vacuum leakage.
- Mazda P0047: In diesel versions, wear on the control valve may occur. Sometimes the error is also accompanied by a drop in EGR system pressure.
- BMW P0047: In diesel models (such as the 320d and X5), the error may be due to a short circuit or a faulty DDE unit.
