P0247 — Turbocharger/Supercharger Wastegate Solenoid “B” #

Note: The wording of this code may differ depending on the vehicle’s manufacturer. Below are some known variations for this DTC label.

• P0247 – Turbocharger Wastegate Solenoid B Malfunction (Ford, GM, Chrysler)
• P0247 – Turbo/Supercharger Boost Control Solenoid “B” Circuit Low (Volkswagen/Audi, BMW)
• P0247 – Turbocharger Wastegate Regulator Solenoid “B” Fault (Peugeot, Citroën)

Code P0247 summary #

The P0247 diagnostic trouble code (DTC) indicates an issue with the wastegate solenoid “B” circuit on a turbocharged or supercharged engine. The wastegate solenoid is an electronically controlled valve that manages boost pressure by directing exhaust gases to bypass the turbocharger turbine, preventing over-boost. “Solenoid B” specifies that the vehicle is equipped with more than one wastegate solenoid, and this code points to a malfunction on the second (“B”) circuit. When the Powertrain Control Module (PCM) detects a problem such as an abnormal voltage or signal in this solenoid’s circuit, it triggers the P0247 code. This issue can result in reduced engine performance, erratic boost levels, and may adversely affect drivability.

Frequent symptoms for code P0247 #

A malfunction in the wastegate solenoid circuit can cause a range of symptoms, often related to inconsistent or insufficient turbo boost. Drivers may notice changes in how the vehicle accelerates or responds under load. If left unresolved, these symptoms can worsen over time and may impact fuel economy or even engine longevity.

• Check Engine Light illuminated on the dashboard
• Reduced engine power or lack of acceleration (“limp mode”)
• Poor turbo response (boost lag or absence of boost)
• Unusual noises from the turbocharger area (such as a whistle or rattle)
• Possible overboost or underboost warnings
• Increased fuel consumption

Probable causes for code P0247 #

This code can arise from a variety of issues, but some causes are far more common than others. Understanding the typical origins of this error helps streamline diagnostic efforts and prevents unnecessary part replacements.

1. Faulty wastegate solenoid “B”: The solenoid itself may have failed electrically or mechanically.
2. Wiring issues: Broken wires, corroded terminals, or loose connectors in the solenoid circuit.
3. PCM/ECM malfunction: Rare, but possible failure in the vehicle’s Powertrain Control Module (PCM) or Engine Control Module (ECM).
4. Vacuum line leaks or blockages: If equipped, vacuum hoses controlling the wastegate may be damaged or disconnected.
5. Connector contamination: Dirt, moisture, or corrosion at the solenoid electrical connection.

Step-by-step diagnostic procedure for code P0247 #

A logical and thorough approach is essential for accurately diagnosing the P0247 code. Skipping steps or making assumptions can lead to wasted time and money. Here’s a recommended sequence for pinpointing the root cause:

• 1. Scan and document all codes: Use an OBD-II scanner to record P0247 and any related codes. Clear codes and see if P0247 returns after a short test drive.
• 2. Perform a visual inspection: Check the wiring, connectors, and vacuum lines (if applicable) around the wastegate solenoid “B” for obvious damage, disconnections, or contamination.
• 3. Test the solenoid: Using a digital multimeter, test the solenoid’s resistance against OEM specifications. If out of range, replace the solenoid.
• 4. Inspect the circuit: Check for continuity, short circuits, or open circuits between the solenoid and the PCM/ECM. Repair as needed.
• 5. Activate the solenoid: If your scan tool allows, perform an active test to command the solenoid on and off while monitoring response.
• 6. Check PCM/ECM signals: If all else checks out, confirm the control module is sending and receiving correct signals. Replace if necessary (rare).

Possible repairs for code P0247 #

The appropriate fix for a P0247 code depends on the exact cause determined during diagnosis. Addressing the most common culprits first can often resolve the issue without unnecessary parts replacement.

• Replace the wastegate solenoid “B” if found defective.
• Repair or replace damaged wiring and connectors in the solenoid circuit.
• Clean corroded connectors and ensure all terminal contacts are secure.
• Repair or replace leaking or disconnected vacuum hoses (if applicable).
• Replace the PCM/ECM only after all other possibilities have been ruled out, and only with OEM-specified programming.

Is it safe to drive with code P0247? #

Limited — Exercise caution. While it is often possible to drive with a P0247 code, performance will likely be compromised, especially under acceleration or heavy loads. Prolonged driving with an unresolved wastegate solenoid issue can lead to engine or turbocharger damage, excessive fuel consumption, or unexpected loss of power (limp mode). It is best to address the issue promptly to avoid further complications.

Vehicles most commonly affected by code P0247 #

This code is most often encountered on vehicles equipped with turbocharged or supercharged engines, especially those from manufacturers known for forced induction technology. The following makes and models see P0247 more frequently, though it can appear on any modern turbocharged vehicle.

• Ford (Focus ST, Fiesta ST, F-Series EcoBoost)
• Volkswagen/Audi (Golf GTI, Jetta TSI, A4 2.0T, Passat)
• BMW (3 Series, 5 Series with N20/N54/N55 engines)
• Peugeot/Citroën turbocharged models
• Chrysler/Dodge (Dart, Neon SRT-4, Ram EcoDiesel)
• GM (Chevrolet Cruze, Sonic, Malibu turbo variants)

Common mistakes & best practices for code P0247 #

Misdiagnosis is a frequent pitfall when addressing P0247, often due to assumptions or incomplete testing. Following best diagnostic practices helps avoid unnecessary expenses and ensures a lasting repair.

• Neglecting the wiring and connectors: Always inspect the circuit visually and with a meter before replacing the solenoid.
• Overlooking vacuum lines: On some systems, vacuum leaks can mimic or trigger this code.
• Skipping step-by-step diagnosis: Guessing at parts replacement results in wasted time and money.
• Not using OEM parts: Aftermarket solenoids may not meet OEM standards; always verify compatibility.
• Failing to clear and recheck codes: Always clear codes after repair and road-test to confirm resolution.

Express FAQ for code P0247 #

Here are quick answers to common concerns about the P0247 code.

• Q: Can a bad wastegate solenoid damage my turbo?
  A: Yes, if the wastegate cannot open or close properly, it may lead to excessive boost pressure and potential turbo or engine damage.
• Q: Is P0247 always caused by a bad solenoid?
  A: No, wiring faults, vacuum leaks, or even PCM/ECM issues can also trigger this code. Always diagnose thoroughly before replacing parts.