P0243 indicates a malfunction in the turbocharger/supercharger wastegate actuator circuit. The Powertrain Control Module (PCM) has detected an electrical or mechanical fault in the actuator or its control circuit, preventing proper boost regulation.
The actuator itself is the most common failure. Internal mechanical binding, diaphragm rupture, or electrical failure (if electronically controlled) prevents proper operation.
Damaged, corroded, or loose wiring/connectors between the PCM and the wastegate actuator can cause open or short circuits, triggering the code.
Leaks in the vacuum lines (for vacuum-actuated wastegates) or boost hoses can cause incorrect actuator movement, leading to the code.
An electronic solenoid that controls vacuum or pressure to the actuator can stick or fail, preventing proper wastegate operation.
PCM failure is very rare for this code. It is almost never the cause unless there are other widespread electrical issues or physical damage to the module.
You may be able to drive short distances, but the vehicle will likely enter a reduced-power or limp mode to protect the engine. Continued driving with a stuck wastegate can cause overboost damage or poor performance, so it's best to diagnose and repair promptly.
No. The code specifically points to the wastegate actuator or its control circuit, not the turbo itself. However, a seized wastegate flap inside the turbo housing can also trigger the code, so the turbo assembly may need inspection.
Almost never. The PCM is rarely the cause of P0243. Most cases are resolved by repairing the actuator, wiring, or vacuum lines. Only consider PCM replacement after all other possibilities have been thoroughly ruled out.