P0246 — Turbocharger/Supercharger Wastegate Solenoid “A” High #

Note: The code label may vary depending on the vehicle manufacturer.

• P0246 – Turbocharger Wastegate Solenoid “A” High (Ford, GM, Chrysler, VW, Toyota, Renault)
• P0246 – Supercharger Wastegate Solenoid “A” High (Jaguar, Land Rover)
• P0246 – Boost Pressure Control Solenoid Circuit High (BMW, Mercedes-Benz)

Summary of DTC P0246 #

The P0246 diagnostic trouble code (DTC) points to a high voltage condition in the wastegate solenoid “A” circuit of vehicles equipped with a turbocharger or supercharger. The wastegate solenoid is an electrically controlled valve that manages the turbo’s boost pressure by regulating exhaust flow to the turbine. When the Engine Control Module (ECM) or Powertrain Control Module (PCM) detects a voltage reading above the specified threshold, it sets the P0246 code. This typically indicates an electrical fault rather than a mechanical issue within the turbo system. The code may illuminate the check engine light and can affect both engine performance and emissions.

Common Symptoms for Code P0246 #

Drivers and technicians may notice several symptoms if a vehicle’s wastegate solenoid circuit is operating at a higher voltage than specified. Some issues may be subtle, while others impact drivability. Typical symptoms include:

• Check engine light illuminated on the dashboard
• Reduced engine power or “limp” mode activation
• Noticeable loss of turbo boost or inconsistent acceleration
• Poor fuel economy
• Unusual turbocharger noise (whistling, fluttering)
• Occasional surging or hesitation under load

Probable Causes of P0246 (by frequency) #

While a wastegate solenoid “A” high code is often linked to electrical faults, it’s important to consider both component and wiring issues. The most frequent causes include:

1. Faulty wastegate solenoid (internal short or stuck open)
2. Wiring issues (short to voltage, damaged insulation, corroded connectors)
3. Defective ECM/PCM (rare, but possible if circuit checks out)
4. Incorrectly installed or aftermarket boost control devices
5. Water intrusion or corrosion at the solenoid connector

Step-by-Step Diagnostic for P0246 #

Diagnosing a P0246 code requires systematic checks to isolate the root cause. Here’s how a professional technician would approach it:

1. Confirm the code with an OBD-II scanner and note freeze-frame data.
2. Inspect the wastegate solenoid and its wiring for visible damage, corrosion, or loose connections.
3. Test solenoid resistance using a digital multimeter (refer to OEM specs).
4. Check for voltage at the solenoid connector with ignition ON.
5. Use a scan tool to command the solenoid ON/OFF and monitor response.
6. Trace wiring back to the ECM/PCM, checking for shorts or open circuits.
7. If all else checks out, suspect ECM/PCM and consult OEM diagnostic flowcharts before replacement.

Possible Repairs for P0246 #

Repairs should always be based on proper diagnosis to avoid unnecessary part replacements. Depending on the underlying cause, solutions may include:

• Replacing a faulty wastegate solenoid
• Repairing or replacing damaged wiring and connectors
• Cleaning corroded electrical contacts
• Re-securing loose connectors
• Reprogramming or replacing the ECM/PCM (only after confirming no wiring/component faults)
• Removing or correcting improperly installed aftermarket boost controllers

Is It Safe to Drive with Code P0246? #

Limited. While some vehicles may continue to run with reduced power or in “limp” mode, driving with a P0246 code is not recommended. The engine may lack proper boost, resulting in sluggish acceleration or unexpected performance drops, which could compromise safety during overtaking or merging. Extended operation under these conditions can also lead to further component stress or damage. Always address the fault as soon as possible.

Vehicles Most Commonly Affected by P0246 #

P0246 is most frequently reported on modern turbocharged and supercharged vehicles that use electronic wastegate control. These typically include:

• Ford EcoBoost engines (Focus, Fiesta, Fusion, Escape, F-150)
• Volkswagen/Audi TSI and TFSI engines (Golf, Jetta, Passat, A3, A4)
• BMW turbocharged models (3 Series, 5 Series, X1, X3)
• Mercedes-Benz turbocharged engines
• GM/Chevrolet turbo models (Cruze, Malibu, Equinox, Silverado)
• Renault and Peugeot turbocharged models

Common Mistakes & Best Practices with P0246 #

It’s easy to misdiagnose P0246 if you skip fundamental checks. Avoid these pitfalls and follow industry best practices:

• Replacing the wastegate solenoid without checking wiring or connectors
• Overlooking aftermarket modifications that may alter boost control
• Ignoring technical service bulletins (TSBs) related to boost control issues
• Not using OEM diagnostic procedures for your specific make/model
• Failing to clear the code and verify repair with a road test

Express FAQ: P0246 #

Q: Can a dirty air filter cause P0246?
A: No. While a clogged air filter can affect engine performance, it will not directly trigger a high voltage code in the wastegate solenoid circuit.

Q: Will clearing the code fix the problem?
A: Clearing the code with a scan tool may temporarily turn off the check engine light, but if the underlying electrical fault remains, the code will return.

Q: Do I need a professional mechanic for this repair?
A: If you’re comfortable testing automotive electrical circuits and have access to a wiring diagram, you can attempt diagnosis. Otherwise, it’s best to consult a qualified technician familiar with turbo systems.