Turbocharger/Supercharger Wastegate Solenoid A Malfunction

What it means

The engine computer has detected an electrical fault in the circuit of solenoid A that controls the turbocharger wastegate. The wastegate regulates boost pressure, so if the computer loses control of it boost may drop or rise, and power is usually limited.

Related codes: P0244P0245P0246P0234P0299

Symptoms4

• Check engine light on.
• Loss of power or limp mode.
• Low or excessive boost depending on the wastegate position when the fault occurs.
• Uneven acceleration.

Possible causes5

• Corroded or loose solenoid connector.
• Open or shorted wire in the solenoid circuit.
• Damaged internal coil in the solenoid.
• Loss of solenoid power from a fuse or relay on some vehicles.
• Driver circuit fault inside the engine computer (rare).

How to diagnose5

1. Visually inspect the solenoid connector and wiring, especially near the hot parts of the turbo.
2. Measure the solenoid coil resistance and compare it with the manufacturer specification.
3. Check supply voltage at the connector with the ignition on.
4. Command the solenoid with a scan tool and listen for its click, or watch the control signal with an oscilloscope.
5. Check continuity and insulation of the control wire between the solenoid and the computer.

How to fix5

1. Clean or replace the connector and reseat it.
2. Repair damaged wiring and protect it from heat.
3. Replace the fuse or relay if power is missing.
4. Replace the control solenoid if its resistance is out of specification or it does not respond.
5. Clear the codes, then test under load and confirm the code does not return.

The cost is low for a connector or wire repair and reaches the upper end when the boost control solenoid is replaced.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions