P0247
Turbocharger/Supercharger Wastegate Actuator B.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 2
- AreaFuel and air metering (injector circuit)
- 47
- FaultThe specific fault in that area
What it means
P0247 relates to the second wastegate control device, labelled 'B', on a turbocharged or supercharged engine. The engine control unit sets it when the control circuit or the response of that wastegate solenoid or actuator is not what it commands. Which part is 'B' (second turbo, second bank or second control device) depends on the model and engine, so check the manufacturer data for your vehicle.
Symptoms
- Engine warning light on
- Loss of power or flat acceleration under load
- Boost too low, or overboost with the engine entering limp mode
- Whistling, fluttering or unusual turbo noises
- Poor fuel economy
- Hesitation or surging when accelerating
Possible causes
- Faulty wastegate control solenoid or electric actuator B (internal failure, sticking or open/short circuit)likely
- Damaged, chafed or corroded wiring, or a poor connector at the solenoid or actuatorlikely
- Split, cracked, disconnected or blocked vacuum or pressure hoses to the wastegate actuatorpossible
- Wastegate linkage or actuator rod seized, corroded or carboned up so it cannot move freelypossible
- Low supply voltage or poor earth affecting the control circuitpossible
- Fault in the engine control unit driver circuitrare
- Outdated control unit software where a known fault is documented by the manufacturerrare
How to diagnose
- Read all stored and pending codes and the freeze frame data, noting load, rpm and boost at the time the fault set, and look for other boost, sensor or wiring codes.
- Visually inspect the wastegate solenoid or actuator, its wiring and connector for heat damage, chafing, oil contamination, corrosion and looseness.
- Inspect all vacuum and pressure hoses to the actuator for splits, kinks, loose fittings and blockages.
- Check the battery condition and charging voltage, and the relevant earth connections.
- Check the actuator rod and linkage move freely and fully by hand or via the manufacturer's actuator test, without forcing it.
- Using the live data, command the solenoid or actuator and compare requested and actual boost or position, and check the response.
- Test the circuit at the connector for supply, earth and signal and for resistance against manufacturer specifications, as these vary by model.
- Check for any manufacturer service information or software updates relating to this code on your vehicle.
How to fix
- Repair or replace damaged wiring or connectors and clear any corrosion.
- Replace the faulty wastegate solenoid or actuator B, followed by any required adaptation or calibration procedure.
- Replace split, perished or blocked hoses and refit them securely.
- Free or replace a seized wastegate linkage or actuator, which may mean repairing or replacing the turbocharger.
- Correct battery, charging or earth faults.
- Apply a manufacturer software update only where an outdated calibration is a documented cause.
Can I keep driving?
The car can usually be driven carefully for a short time, but the engine may go into limp mode and an uncontrolled wastegate can cause overboost and engine or turbo damage. Have it diagnosed soon, and stop driving if power surges, overboost or unusual noises occur.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.