P0247 Code – Wastegate Solenoid B Malfunction Explained

The P0247 code is a turbocharger-related diagnostic trouble code that indicates a malfunction in the secondary wastegate solenoid circuit, often referred to as solenoid “B”. This issue affects how the engine manages boost pressure, especially in vehicles equipped with more advanced or dual-stage turbo control systems.

When the P0247 code is triggered, the engine control unit can no longer properly regulate part of the boost control system. This can result in inconsistent turbo behavior, reduced engine performance, and increased stress on key components if left unresolved.

What Does P0247 Code Mean?

The P0247 code stands for:

Turbocharger Wastegate Solenoid B Malfunction

This means the ECU has detected a fault in the electrical circuit controlling the second wastegate solenoid.

In systems with multiple control valves, solenoid “B” works alongside solenoid “A” to fine-tune boost pressure under different load and speed conditions.

How the System Works

To understand the P0247 code, it is important to look at multi-stage turbo control.

In some engines, especially modern turbocharged setups, multiple solenoids are used to precisely regulate boost pressure. These solenoids control how much exhaust gas reaches the turbine and how the wastegate responds under varying conditions.

If solenoid B fails, the system loses part of its control precision, leading to inefficient or unstable turbo operation.

What Causes the P0247 Code?

The P0247 code is typically caused by electrical faults or component failure within the secondary control circuit.

Faulty wastegate solenoid B

The most common cause is a failed or unresponsive solenoid.

Wiring or connector issues

Damaged wiring, corrosion, or loose connectors can interrupt the circuit.

Open or short circuit

Electrical faults can prevent proper signal transmission.

Control module signal issues

Incorrect signals from the ECU can also trigger the code, though this is less common.

System wear or contamination

Over time, dirt or deposits can affect solenoid operation.

Symptoms of P0247 Code

The P0247 code can lead to noticeable and sometimes inconsistent performance issues.

Common symptoms include:

• Check engine light illuminated

• Reduced engine power

• Inconsistent turbo boost

• Hesitation during acceleration

• Limp mode activation

• Decreased fuel efficiency

Drivers may notice that performance varies depending on driving conditions.

Is P0247 Code Serious?

The P0247 code is moderately to highly serious.

Because it affects turbo control precision, it can lead to:

• Unstable boost pressure

• Reduced engine efficiency

• Increased wear on turbo components

• Potential progression to more severe faults

Ignoring this code can result in more expensive repairs over time.

Can You Drive with P0247 Code?

Driving with the P0247 code is possible, but not recommended.

The vehicle may continue to operate, but:

• Performance will be inconsistent

• Turbo efficiency will be reduced

• Risk of further issues increases

Short-term driving is manageable, but repair should not be delayed.

How to Fix P0247 Code

Fixing the P0247 code requires a systematic inspection of the turbo control system.

1. Inspect wiring and connectors

Check for damage, corrosion, or loose connections in the solenoid B circuit.

2. Test the wastegate solenoid B

Measure resistance and verify proper operation.

3. Check voltage and ground signals

Ensure the solenoid receives correct electrical input.

4. Inspect related components

Check vacuum lines and mechanical parts connected to the wastegate.

5. Replace faulty components

If the solenoid is defective, replacement is usually necessary.

6. Clear the code and test drive

Reset the ECU and confirm that the issue no longer appears.

Repair Costs and Difficulty

Repair costs for the P0247 code vary depending on the issue.

• Solenoid replacement: moderate cost

• Wiring repair: low to moderate cost

• Advanced system diagnostics: varies

Early intervention helps avoid more expensive turbo repairs.

Related Codes

The P0247 code is closely related to other wastegate solenoid faults:

• P0243 – Wastegate Solenoid A Malfunction

• P0244 – Range/Performance Issue

• P0245 – Low Input

• P0246 – High Input

These codes often indicate similar issues within the turbo control system.

Conclusion

The P0247 code indicates a malfunction in the secondary wastegate solenoid circuit, affecting turbo boost control and overall engine performance. While the vehicle may still run, the system is no longer operating at full efficiency.

Timely diagnosis and repair are essential to restore proper turbo function and prevent further complications.