Subaru Turbocharger Explained Part 2:

Turbo System Diagnostic Trouble Codes (DTCs)

There are only a few diagnostic trouble codes that pertain to the turbocharging system.They focus on problems with the wastegate solenoid valve, but may indicate other causes or additional problems.

PO244 Wastegate Solenoid “A” Range/Performance

Symptoms for this DTC may include poor idling, engine stalling, or poor driving performance. Refer to the correct service information for the vehicle you are servicing regarding inspecting and testing the wastegate control solenoid valve.

PO245 Wastegate Solenoid “A” Low

Symptoms for this DTC may include poor idling. Refer to the correct service information for the vehicle you are servicing regarding inspecting and testing the wastegate control solenoid valve.

The culprit may be one of the following:

■ An open circuit in the harness between the ECM and the wastegate control solenoid valve connector.
■ An open circuit in the harness between the main relay and the wastegate control solenoid valve connector.
■ A faulty wastegate control solenoid valve.

PO246 Wastegate Solenoid “A” High

Symptoms for this DTC may include poor idling. Refer to the correct service information for the vehicle you are servicing regarding inspecting and testing the ECM. After repair or replacement of faulty parts, always remember to clear the DTC from the ECM memory and recheck to see that it is fully erased. The exact procedures for correcting the problems and erasing DTCs may vary according to model and year.