P0246 — Turbocharger/Supercharger Wastegate Actuator A High

P0246: Turbocharger/Supercharger Wastegate Actuator A High — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Turbocharger/Supercharger Wastegate Actuator A High. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • Engine warning lamp and sometimes reduced engine power.
  • The wastegate solenoid A control circuit reports a high electrical signal; it does not by itself prove actual overboost.

Possible causes

  • Open or chafed harness, poor ground or a short to supply in the solenoid-control path.
  • Failed wastegate control solenoid; ECU driver fault only after wiring and actuator tests.

What to check

  • Confirm P0246 and identify the solenoid A pins from the vehicle wiring diagram.
  • Inspect insulation, plug contacts and any nearby heat-affected loom.
  • Test commanded control voltage, continuity and solenoid electrical characteristics using the manufacturer's procedure.
  • Distinguish a high electrical input from excess manifold pressure using separate live-boost data.
  • Repair verified circuit/solenoid fault and repeat scan and boost-control check.

Also written as: P0246-00, P024600, PO246 (some scan tools add the fault-type byte, e.g. -00).