OBD-II Code · Powertrain
P0243
Powertrain Diagnostic Code (P0243)
See deep dive below for full diagnostic context.
Common symptoms
- CEL
Likely causes
- See deep dive
Where to start
- Try the cheapest cause first. Start by checking: see deep dive.
- Cost & scope. $50-$2,000
- If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there.
Read the full diagnostic procedure
P0243 reports an electrical fault in the turbocharger wastegate solenoid A control circuit, meaning the PCM is commanding the solenoid but seeing no current flow, a short, or an open. Begin with the cheapest diagnostic: unplug the solenoid connector and measure resistance across the two pins, which should read between 14 and 30 ohms on most domestic and European applications (Ford EcoBoost spec is 11-15 ohms cold, VW N75 is 25-35 ohms); an open or shorted reading condemns the solenoid for about $60-$180. Next, verify the PCM-side circuit with the connector unplugged, key on, looking for battery voltage on the supply pin and a PCM-driven ground pulse on the control pin. The expensive misdiagnosis is replacing the turbo actuator or entire turbocharger when a $90 solenoid, a chafed harness near the heat shield, or a melted connector was the only issue.
Vehicle-specific patterns
Vehicle-specific patterns: 2006-2014 VW/Audi 2.0T N75 valve fails by diaphragm rupture, throwing P0243 with overboost cuts addressed by superseded part 06H 906 627; 2011-2016 Ford F-150 3.5L EcoBoost wastegate control solenoid mounts on the driver-side valve cover and cooks from exhaust manifold radiant heat (TSB 16-0083); 2007-2013 BMW 335i N54 uses a vacuum-controlled wastegate solenoid that sticks open from oil ingestion through the PCV; 2010-2015 Hyundai Sonata 2.0T solenoid harness chafes against the turbo heat shield bracket. Estimated repair: $120 to $480.
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