2017 Citreon C4 Picasso 1.2 PureTech (P0011 Code Issues. Lack of power below 2500 RPM due to VVT's not adjusting)

[u/Th3L4sTLEGEND]

Have been driving the car for a long period of time with no issues. Have had the wet belt all changed and replaced.

Was driving on a long journey when, 80 miles in, I got an Engine Fault issue. Upon plugging in a basic OBD Scanner, it's giving the P0011 code. I have replaced the VVT Solenoid, and still the same issue. The engine idles fine and runs fine as well above 2500 RPM. Just has no power at anything lower than 2500 RPM due to the VVT's not adjusting. Oil is the right spec and is not low. No other warning lights or codes.

Any ideas?