P0247 — Turbocharger Wastegate Solenoid B Malfunction

What does P0247 specifically identify?

P0247 identifies a malfunction involving turbocharger wastegate solenoid B, its control circuit, or the actuator response that prevents normal wastegate operation.

Is it safe to keep driving with P0247?

Limited driving may be possible if the engine runs normally and boost stays controlled, but aggressive acceleration should be avoided because an incorrect wastegate can cause loss of power or overboost.

Can a leaking hose or dirty wastegate cause P0247?

Yes. A leak, contamination, or binding actuator can prevent proper wastegate movement and may contribute to P0247, even when the solenoid and wiring test normally.

Does P0247 always require turbocharger replacement?

No. Testing the solenoid, connector, harness, control signal, and actuator first can often identify a much less expensive repair than replacing the complete turbocharger assembly.

When your engine control unit detects a problem with the turbocharger's wastegate solenoid B, it logs OBD2 code P0247. This fault falls within the powertrain category, specifically addressing the boost regulation system that forces air into the engine. The wastegate solenoid controls turbo boost pressure by routing engine vacuum to the wastegate actuator — without proper operation, the turbo either over-boosts (risking damage) or under-boosts (losing power).

The ECU doesn't trigger P0247 from a single bad reading. It requires repeated failure under specific operating conditions before illuminating the Check Engine Light. When the code sets, the ECU also captures freeze frame data — engine RPM, load percentage, temperature, and vehicle speed at the moment of detection. This snapshot reveals exactly when and where the fault occurred, giving you precise conditions to replicate during testing.

The underlying issue could stem from the solenoid itself, its wiring harness, a clogged vacuum line, or even the ECU's boost control logic. Since the malfunction can originate in either the component or the control module, you'll want to check electrical signals before assuming the solenoid needs replacement.

Symptoms of P0247

When code P0247 becomes active, drivers typically notice one or more of the following:

• Noticeable drop in engine performance and acceleration
• Vehicle enters reduced-power limp-home mode
• High-pitched whistling or siren-like sound from the engine bay during acceleration
• Higher-than-normal oil consumption
• Check Engine Light remains illuminated

Common Causes

The most frequent reasons the ECU stores P0247 include:

• Cracked, chafed, or corroded wiring in the solenoid circuit
• Faulty or weak driver circuit inside the powertrain control module
• Failed wastegate solenoid B (internal coil short or open)
• Boost pressure leak — cracked intercooler hoses, loose clamps, or damaged piping
• Stuck or binding wastegate actuator
• Faulty boost pressure sensor providing incorrect readings
• Clogged exhaust (DPF) or restricted intake restricting proper turbo operation
• Worn or damaged turbocharger bearings causing inconsistent spool

How to Diagnose P0247

Follow these practical steps to isolate the root cause before spending money on parts:

1. Connect an OBD2 scanner, confirm P0247 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
2. Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
3. Visually inspect the wiring harness and connectors related to the turbocharger / supercharger boost control for damage, corrosion, chafing or poor contact.
4. Run the module's actuator test for the turbocharger wastegate solenoid b if your scanner supports it — a component that does not respond to a direct command is confirmed faulty.
5. Pressure-test the intake piping for boost leaks — cracked intercooler hoses are the most common cause.
6. Command the boost control solenoid with a scanner and verify wastegate movement.
7. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P0247 does not return.

Repair Options and Costs

Start with the cheapest and most common causes before replacing expensive parts:

• Turbocharger replacement — $1,200–$3,500
• Replace boost control solenoid or actuator — $200–$600
• Repair boost leak (hoses, clamps, intercooler) — $100–$400

The total cost to fix P0247 depends entirely on what actually failed. The most affordable fix is addressing a boost leak — cracked intercooler hoses, loose clamps, or damaged couplings — which typically runs $100–$400. Replacing the boost control solenoid or actuator is the next step, costing $200–$600. The most expensive scenario is a failed turbocharger requiring full replacement, which can reach $1,200–$3,500. Most vehicles will fall somewhere in the $200–$600 range, but a proper diagnosis before buying parts always saves money — the worst-case scenario should never be your first assumption.

Driving Safety Verdict

Caution. You can drive a vehicle with P0247 stored, but you should avoid hard acceleration and high boost loads. The engine management system will likely derate power to protect itself, and the car will feel sluggish. Ignoring the fault and continuing normal driving can lead to over-boost conditions that overheat components or catastrophic turbo failure. A $300 solenoid replacement can prevent a $2,500 turbo replacement — get this checked before your next long trip.

Related OBD2 codes

• P0200: Injector Circuit Malfunction
• P0201: Injector Circuit Malfunction - Cylinder 1
• P0202: Injector Circuit Malfunction - Cylinder 2
• P0203: Injector Circuit Malfunction - Cylinder 3
• P0204: Injector Circuit Malfunction - Cylinder 4
• P0205: Injector Circuit Malfunction - Cylinder 5