What Does P0243 Mean?
The ECM has detected a malfunction in the turbocharger wastegate solenoid A control circuit. This solenoid controls boost pressure by opening or closing the wastegate valve. When it malfunctions, boost pressure cannot be properly regulated. The driver may notice overboost or underboost conditions, reduced power, surging, or check engine light illumination with limp mode.
Common Causes
35%
Failed wastegate solenoid A (open or shorted coil)
25%
Damaged, broken, or chafed wiring to the wastegate solenoid
20%
Corroded or disconnected connector at the solenoid
10%
Faulty ECM driver circuit for solenoid A
10%
Vacuum hose leak or disconnection at the solenoid
Diagnostic Steps
1
Locate the wastegate solenoid A (typically mounted on or near the intake manifold or turbo housing) and inspect the connector for corrosion, damage, or disconnection.
2
Measure the solenoid coil resistance — typical range is 10-40 ohms depending on manufacturer. An open (OL) or zero-ohm reading indicates a failed solenoid.
3
With the solenoid disconnected, check for battery voltage on the supply pin and verify the ECM ground driver toggles when commanded — use a noid light or scope to confirm the ECM is pulsing the ground.
4
Inspect vacuum hoses connected to the solenoid for cracks, splits, or disconnections. Apply vacuum with a hand pump through the solenoid and verify it holds and releases when power is applied to the solenoid.
5
Check the wastegate actuator rod for free movement. A stuck or seized wastegate will cause the code even with a good solenoid. Move the actuator arm by hand — it should move freely with spring resistance.
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
The ECM has detected a malfunction in the turbocharger wastegate solenoid A control circuit. This solenoid controls boost pressure by opening or closing the wastegate valve. When it malfunctions, boost pressure cannot be properly regulated. The driver may notice overboost or underboost conditions, r...
The most common cause of P0243 (Turbocharger Wastegate Solenoid A Malfunction) is: Failed wastegate solenoid A (open or shorted coil)
Typical repair costs for P0243 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Uncontrolled boost pressure is a serious concern. Overboost can cause engine damage (blown head gasket, cracked pistons, bent connecting rods). If you notice excessive boost or unusual turbo whine, stop driving immediately. If the turbo is underperforming with reduced power, you can drive gently to a repair facility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0243 to identify the root cause.
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Quick Info
Category
Powertrain
System
Turbocharger / Supercharger System
Difficulty
Type
Generic (SAE)
Recommended Tools
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