T6.1 199 Bi Turbo DSG - Possible Turbo Issues

[Cbarrett]

I'm after some advice/thoughts. I have had since new a T6.1 199 Bi Turbo DSG which now has 70k miles with full main dealer service history which I only use as a weekend getaway so it's done no heavy lifting. About 6k ago I had a remap done and the engine 100% feels smoother but don't know if it's a coincidence but I within 2k miles I had a warning light and went into limp mode. I took the van in to one of the recommended independents on here in the north west and they advised changing the charge cooler and pipes with the vehicle being fine for about 500 miles when on a journey up to do the NC500 when the light came on, turn the engine off and on and it's cleared. For info when under load i.e. higher revs when it's moving up and down the gears I never have an issue or when driving around town. The time it appears is when I'm sat at a steady speed i.e. 75mph when in cruise control. So back to the garage again and they carried out some checks and diagnosed Boost Pressure Regulation - P0299 - Control Range Not Reached, System Voltage 1 PO56200 too low, Sensor reference Voltage 1 PO6A00 Implausible signal with the suggested remedy being charge pressure actuator G581 has internally failed and needs to be replaced - all in I'm talking £1975.54. Obviously only 500 miles before I thought is was sorted so I'm nervous that I spend £2k and still it comes back.... So as a second opinion I went to another suggested independent in the Midlands where I live and suggested in may be turbos at nearly £4k to replace... Any thoughts/suggestions or has anyone else had a similar problem ??

 

[mmi]

within 2k miles I had a warning light and went into limp mode.

Any record of the fault code then?

advised changing the charge cooler and pipes

What was the reasoning behind?

on a journey up to do the NC500 when the light came on,

Any record of the fault code?

So back to the garage again and they carried out some checks and diagnosed Boost Pressure Regulation - P0299 - Control Range Not Reached, System Voltage 1 PO56200 too low, Sensor reference Voltage 1 PO6A00 Implausible signal

The same garage which replaced the charge air cooler?
Are the above based on their checks and diagnosing, or just the fault codes from your incident?

PO6A00

Can't find such a code.

remedy being charge pressure actuator G581 has internally failed and needs to be replaced

G581 is position sensor of the charge pressure actuator. Got any more details how it was determined - especially having sensor reference fault at the same time (possibly)?

So they did they rule out the charge pressure sensors themselves and air leaks?

The ECU has quite a few built-in tests for the turbocharger and its components (actuators) - see below

Thread '[T6_measured] 01-Engine - Built-in tests for turbocharger'

13 Oct 2024

01-Engine - Basic Settings​

IDE00457-Test of turbocharger​

HOW-TO​

Engine running​

VCDS > Select > Engine > Basic Settings > IDE00457-Test of turbocharger​

Select "Show Measuring Data" ​

Pick up e.g. the following data items for monitoring:

IDE00021 Engine RPM​

IDE00347 Air mass: actual value​

IDE07736 Turbocharg.2 compress.outlet: press.sensor 1 bank 1: raw value (bi-turbo only)​

IDE07738 Charge air cooler inlet: pressure sensor 1 bank 1: raw value​

IDE07744 Particle filter: air pressure...​

• mmi
• t6_measured turbo vcds
• Replies: 8
• Forum: Engine, Gearbox, Exhaust, Drivetrain

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Search results for query: P0299

www.t6forum.com

 

[Cbarrett]

Hi yes it was the same garage who changed the cooler and the pipes, certainly with the pipes they said there was a leak.

 

[Cbarrett]

I have found these from the service when they changed the cooler if this helps

 

[mmi]

Hi yes it was the same garage who changed the cooler and the pipes, certainly with the pipes they said there was a leak.

I have found these from the service when they changed the cooler if this helps

So it was also then the P0299 - underboost - only.

---

Then currently

So the garage suggests the culprit for all the faults is actua lly G581 of the charge pressure actuator.
The G581 indeed uses "Sensor reference voltage 1" as a reference but so do a couple of other sensors (which currently report no faults or implausible values).

Would be fairly simple to get better understanding/confirmation by unplugging G581 and monitor e.g. both charge pressure sensors if their value would change G581 plugged/unplugged. When engine off the sensors should report atmospheric pressure. Although I'm confident they already have done that to pinpoint the G581 as the culprit

 

[Cbarrett]

So it looks like this may be the fault from what you say which gives me more confidence - thank you for your help and advice

 

[Cbarrett]

Sorry I meant to ask is £2k a sensible price to get this repaired ?

 

[Cbarrett]

View attachment 308422
So it was also then the P0299 - underboost - only.

---

Then currently
View attachment 308423
So the garage suggests the culprit for all the faults is actua lly G581 of the charge pressure actuator.
The G581 indeed uses "Sensor reference voltage 1" as a reference but so do a couple of other sensors (which currently report no faults or implausible values).

Would be fairly simple to get better understanding/confirmation by unplugging G581 and monitor e.g. both charge pressure sensors if their value would change G581 plugged/unplugged. When engine off the sensors should report atmospheric pressure. Although I'm confident they already have done that to pinpoint the G581 as the culprit

Sorry I meant to ask is £2k a sensible price to get his repaired ?

 

[mmi]

Sorry I meant to ask is £2k a sensible price to get his repaired ?

Sounds quite a lot - but I don't know what's going rate for a garage in the UK.
@Westcoast888 have replaced the actuator in CXEB engine (below) so perhaps he can give us some insight. Perhaps @BognorMotors or @Dav-Tec can advise?

W

Post in thread 'Help please Flashing coil light and EML on. Multiple codes 31391 27202 8208 8216 8217 8338'

26 Sep 2024

Replacement actuator ordered direct with Sinclair VW just shy of £280 with starmers cut. Will be able to collect tomorrow which gives me enough time to practice dislocating my fingers in readiness for the swap!

Has anyone replaced one before? Any advice greatly appreciated!

• Westcoast888

• 

 

[Cbarrett]

Once again I really appreciate your help. I’m happy to travel to find the right person, service and price for sure

 

[Westcoast888]

Once I had identified the fault it was pretty easy to fix. Have a read of my thread on how I did it with @mmi help.
Part was £280 and you’ll need vcds to set up the new actuator and a few hours.

 

[Cbarrett]

Thanks - so is this something you could do ?

 

[Westcoast888]

Thanks - so is this something you could do ?

Sorry no I’m just a diy mechanic. Should be easy enough for a competent garage with vcds. I can help with advice where I can. Tbh I tried some professional help first but when they couldn’t find the problem I had a go as I thought I had nothing to lose. I’m pretty handy with the spanner’s but it wasn’t a particularly difficult job. Have a read of my thread from start to finish and have a go yourself?