A4 B8 CCWA CP3+2568VK rail pressure too high

[TraneTommy]

Hi,
I've an A4 B8 3.0 CCWA with cp3 and 2568vk hibrid turbo.
And my problem is the High rail pressure dtc.
All the sensors are new, fuel filter is new.
The DTC is p0088. What will be the problem? The rail pressure is not really high...