P0299 fault on GTD

[bbewekim]

Car goes into limp mode at boost in high gears.

16683/P0299/000665 - Boost Pressure Regulation: Control Range Not Reached



Possible Symptoms:

Reduced Power Output
Limp Mode
Possible Causes
Hoses/Pipes incorrect connected, disconnected or leaking
Charger Pressure Control defective
Turbocharger faulty
Diverter Valve faulty

Possible Solutions:

Check Hoses/Pipes to/between Components
Check / Clean / Replace Charge Pressure Control
Check Turbocharger
Check Diverter Valve
Special Notes
When found in 2.0l TFSI:
Check Boost Pressure Control Valve (N249), for cracked rubber diaphragm. A new/optimized Valve is available under Part # 06H-145-710-D (or newer).
RoW vehicles see: TPI 2016331 for details.
NAR vehicles see: TSB 01-07-70 or 2013392 for details.
When stored in conjunction with misfire codes and/or fuel trim faults see the notes associated with the following faults regarding PCV failure: Crankcase Breather Valve
If the Turbocharger is faulty due to mechanical / internal problems or the exhaust system is restricted (typically the Catalyst) this fault may be the end result.
When found in VW Golf/Jetta (1K): 2.0l CR-TDI (CBEA/CJAA):
Verify the mechanical part of the Exhaust Valve Control Module (J883) is not siezed or binding.

Had it "fully" checked out today at a reputable specialist and they said everything is fine... Though I knew it was still down on power... Happened again tonight anyway so ill be going back to the garage first thing.

The guy said the only thing was the n249 took a lot of pressure to move :/ so that's possibly it... Though I have a feeling they haven't checked the exhaust valve.

Anyone had this on their mk6? Be nice to hear its an easy fix.

[Marshy]

Is your car mapped?
What age is your car?
Have you checked to make sure the turbo actuator rod moves on startup? Visable from the top at the back of the engine bay.

[Poached]

Well we can cross Diverter valve N249 off the list since your driving a TDI as it doesn't have one .

Can you get under the car and check a charge pipe hasn't popped off somewhere?

It's possible that the vane adjustment system for the VGT isn't or wasn't working properly as a result of an N75 Wastegate fault.

The Turbo has an emergency position where the vanes remain in a low boost position.

Really the cars boost pressure requested vs actual values needs to be logged.

[bbewekim]

Thanks, did wonder with the n249 as I had a 1.8t but when I rang Vw they even quoted me a price for the part, knowing my registration and car!

The car had a full check with VCDS, literally checked everything and then put the car in the air and had a look.

Can requested/actual boost logs be done without driving or a rolling road? With the mk6 not revving past 2.5k out of gear?

[Poached]

I think you need a load on the engine like a 3rd gear pull from x rpm to x rpm.

[Rhyso]

I think you need a load on the engine like a 3rd gear pull from x rpm to x rpm.

This ^^^^

3rd gear, full throttle from 1500rpm to the redline

Aother option could be to have the system smoke tested for any boost leaks

Is the car permanently stuck in limp mode or does the power come back if you switch the ignition off and back on again?

[bbewekim]

Well £300 later they've replaced the actuator :/

[Poached]

How was it diagnosed? It did sound like it was an actuator fault.

[bbewekim]

They tested everything yesterday, found no boost leaks or anything on vcds other than the codes I gave them. He said when he pressure tested the actuator it wasnt working that well and could be the fault. Checked again today and it was the same, he rang rosstech or whoever whom confirmed its a viable option to fix the fault code.

[Keithuk]

VAG Error Code: 16683
EOBD II Error Code: P0299

Fault Location:
Turbocharger (TC)/Supercharger (SC) - Low Boost, Control Range not Reached

Possible Cause:
Malfunction Indicator Lamp (MIL)(K83) active.
Reduced Power Output.
Limp Mode.
Limp mode: What is it, what are the causes, and how to fix it for the Audi and VW TDI diesel turbo

Hoses/Pipes incorrectly connected, disconnected or leaking.
Charger Pressure Control defective.
Turbocharger (TC) faulty.
Diverter Valve faulty.
Mechanical fault.

Possible Solutions:
Check Hoses/Pipes to/between Components.
Check / Clean / Replace Charge Pressure Control.
Check Turbocharger (TC).
Check Diverter Valve.

Special Notes:
When found in 2.0l TFSI:
Check Boost Pressure Control Valve (N249), for cracked rubber diaphragm. A new/optimized Valve is available under Part # 06H-145-710-D (or newer).
RoW (Rest of World) vehicles see: TPI 2016331 for details.
NAR (North American Region) vehicles see: TSB 01-07-70 or 2013392 for details.
When stored in conjunction with misfire codes and/or fuel trim faults see the notes associated with the following faults regarding PCV failure: Crankcase Breather Valve
If the Turbocharger is faulty due to mechanical / internal problems or the exhaust system is restricted (typically the Catalyst) this fault may be the end result.
When found in VW Golf/Jetta (1K): 2.0l CR-TDI (CBEA/CJAA):
Verify the mechanical part of the Exhaust Pressure Control Valve (J883) is not siezed or binding.


As taken from my EOBD II Fault Codes Software