[Dee67]

Is fuel pressure the only code in dme? Post all codes.
Doubt software. If pressure is low its low.
May be timing chain as pump driven from camshaft.
Any misfire faults.
if you clear codes how do you get codes to come back.
how far you drive and how drive hard or normal.

Actually I have done head gasket job on it ..skimmed head and valves reseated.
Timing been checked and ok. I have no issue with it starting maybe bit lumpy for short while then settles down. I take it for a drive and most times it's ok then all of sudden it starts to hesitate and not wanting to accelerate and then warning comes on idrive 'power train malfunction'. If I then stop the car and turn off for a minute or so it will fire up and run normal with no warnings. When I put ISTA D
and diagnose.. it comes up with 'high pressure pump plausibility' error.

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It's the power supply module in engine room.



unable power voltage supply make fuel pump have unstable fuel pressure.

Thank you for the diagram..any pointers to  what I should check for? Cheers