Error code advice please (throttle actuator/turbo boost)

[Turkish1]

When plugged in my Mk2 Leon 1.9 TDi is producing the following codes:
1) P0299- Boost Pressure Regulation: Control Range Not Reached
2) P2100-Throttle Actuator Control Motor Circuit/Open
3) P2102-Throttle Actuator Control Motor Circuit Low

The story so far....
-Last week Emissions Control System warning light came on and car went into limp mode
-Local garage advised that throttle actuator needs replaced (VW only part at £380 + fitting, apparently). They didn't mention anything about error code #1.
-Car runs ok, apart from low boost which obviously affects performance.

I'm looking for some advice as to whether it's likely I have 1 or 2 issues here. Is error code #1 likely to have caused errors #2 & #3? I'm reluctant to spend £400+ on a throttle actuator when there may be some other issue with the turbo that's causing problems.

Yes, I know I need to get it hooked up to VAGC OM. I'm still trying to find someone who is able to provide a more detailed analysis instead of just code reading. So in the meantime I'd be grateful for any thoughts/advice.

Thanks

 

[Masterkm]

Is there smoke coming from the rear? Im putting money on turbo atm

 

[Turkish1]

There is no smoke unless I put my foot flat to the floor but, even then, it's no more than I'd expect through flooring a diesel car.

I can still hear a whistle and there is a bit of boost - just not full. If it was the turbo would it stop working completely, or could it continue to work at reduced capacity?

 

[Masterkm]

Most likely it would stop totally, looks like it maybe a different issue

 

[ginger monster]

have you changed the air pressure switch on the turbo???
if you have not try this you can get one for £50 and easy to fit, can give you a walk through for fitting also

i just changed mine today found a rip in the diaphragm once tested gave me a substantial power gain

this should solve error code 1

 

[James_R]

have you changed the air pressure switch on the turbo???
if you have not try this you can get one for £50 and easy to fit, can give you a walk through for fitting also

i just changed mine today found a rip in the diaphragm once tested gave me a substantial power gain

this should solve error code 1

Its called a divertor valve and yes - i'd try this before going any further

 

[Rosskie]

Thought tdis didn't have a dv

 

[James_R]

Thought tdis didn't have a dv

Yes you are very right!

Forgive my ignorance I completely missed that on the first line, unless you foolishly choose to fit one diesels don't have a dump valve.

It's under boosting possibly due to sticky vanes or a split/loose pipe and the other fault tends to be broken wires in the loom near the gearbox.

 

[Kevgrady]

Actuator.