hello everyone I have this problem: exceeding 3500 rpm the car goes into recovery with engine light on. I have detected error P0234, if I clear it is fine but shortly afterwards it reoccurs.

I should mention that I have already changed the turbo management solenoid valve, I have checked the vacuum hoses and they are all healthy and I have also checked if the turbo rod runs and it is OK. The car is fitted with an ECU EDC16C34.

can someone give me a hand? thank you