Turbo or Torque converter?

[Nightdriver]

Here goes. My gears shift hard into all gears when stationery. When my foot is on brakes while I D the engine seems to rev higher and car is raring to go quickly.
Star diagnostic shows only fault as being (fault code 2592 001 component Y77/1 charge pressure positioner) described as Turbo actuator by indie garage..
However
My regular indie thinks it's the Torque Converter in the 722.9 GTRONIC gearbox/tranny. Others agree with him as turbo seems to be working fine. As do the gears while car is driving.
Help!!!

 

[Nightdriver]

Here goes. My gears shift hard into all gears when stationery. When my foot is on brakes while I D the engine seems to rev higher and car is raring to go quickly.
Star diagnostic shows only fault as being (fault code 2592 001 component Y77/1 charge pressure positioner) described as Turbo actuator by indie garage..
However
My regular indie thinks it's the Torque Converter in the 722.9 GTRONIC gearbox/tranny. Others agree with him as turbo seems to be working fine. As do the gears while car is driving.
Help!!!

Looks like I'm going to have to start with replacing Turbo this has come up twice as a fault on diagnostics. It's also the cheaper of the two. My thinking is if it's flagged up twice it needs fixing anyway even if ultimately isn't the cause öf the hard shifting. Not happy

 

[bob6600]

Mercedes do not supply just the actuator but they are available and a lot cheaper than a turbo

 

[Nightdriver]

Mercedes do not supply just the actuator but they are available and a lot cheaper than a turbo

£450 for a turbo recon exchange plus seals + labor.so about £700 all in.
main dealer price £960 for just recon/exch plus labor etc.
I'm going for the cheaper option but still not sure that this is the problem.

 

[bob6600]

Circa £700 is a lot to be having a guess. If you want to eliminate the turbo, try sourcing an actuator, it's much cheaper

 

[BlackC55]

Or get it diagnosed properly.

 

[Nightdriver]

Or get it diagnosed properly.

Great technical advice thanks geez

 

[markjay]

Great technical advice thanks geez

It's sound advice... a good specialist will follow through with proper and full diagnosis, not just tell you to spend £700 on a reconditioned turbo and see how it goes.

It seems that rather than paying for proper fault diagnosis, you just paid for STAR code reading. The two are not the same.

BlackC55 is trying to be helpful... spend a bit more on proper diagnosis and save yourself the grief of replacing parts by guesswork.