P0243 moderate

Turbocharger/Supercharger Wastegate Solenoid A Malfunction

The P0243 code means the vehicle's onboard diagnostic system has detected: Turbocharger/Supercharger Wastegate Solenoid A Malfunction. This is a moderate severity code.

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Keep driving?: Short distances only
DIY difficulty: moderate
Estimated cost: $100 - $400 (parts and labor)

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Common Symptoms

Check Engine Light illuminated
Overboost or underboost condition
Reduced engine power or limp mode
Turbo boost fluctuates erratically
Poor fuel economy

Probable Causes (Ranked by Likelihood)

Faulty wastegate boost control solenoid Very High
Damaged or corroded solenoid wiring or connector High
Vacuum line to wastegate cracked or disconnected High
Mechanically stuck wastegate actuator Moderate
PCM wastegate driver circuit failure Low

Step-by-Step Diagnostic Procedure

Test wastegate solenoid resistance with a multimeter -- should be 20-35 ohms depending on manufacturer
Activate the solenoid with a scan tool bi-directional test and listen for clicking
Inspect vacuum lines from the solenoid to the wastegate actuator for cracks or leaks
Check for 12V power and PCM ground signal at the solenoid connector
Replace solenoid if resistance is out of spec or it fails to actuate during testing

Frequently Asked Questions

Can I drive with code P0243?

You can drive short distances, but boost control will be unreliable. The engine may overboost (risking damage) or underboost (lacking power). Get it repaired promptly.

Where is the wastegate solenoid located?

The wastegate solenoid is typically mounted on the intake manifold or near the turbocharger. It is a small electromagnetic valve with vacuum lines running to it and to the wastegate actuator.

Can I replace the wastegate solenoid myself?

Yes. The solenoid is usually accessible and held in place with one or two bolts. It is a relatively straightforward replacement if you can identify the part and its vacuum line routing.