The BHW has the simplest vacuum system of all the TDIs sold in North America. That makes troubleshooting the VNT system easier. Less places for vacuum leaks.
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But with a proper scan tool, you can easily check the VNT movement in Basic Settings with the engine running. It will cycle the N75 on/off in ~5 sec stages so you can just sit and watch the VNT actuator moving up and down.
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Let us know what you find.
Jumping into this discussion, gang, because We drove the '05 Passat into the Sierras for a camping trip, and ran into this issue. Connecting my handheld scanner while in the mountains showed the dreaded P0299 code, along with the loss of power when climbing hills. Clearing the code immediately returns turbo to normal, but not for long when attempting to accelerate up those steep roads. Good times.
Once we got home, I hooked up the RossTech VCDS and ran the Basic Settings as Oilhammer described, and the VNT actuator moves fine. A visual inspection of the vacuum hoses doesn't show any obvious issues, but I'll admit that I haven't yet had time to really dig into it. The code set while I was driving with the laptop connected to the VCDS, and here's what I pulled from it:
VCDS Version Release 23.3.1 (x64) Running on Windows 10 x64(VMWare)
www.Ross-Tech.com
Address 01: Engine Labels: 038-906-016-BHW.lbl
Control Module Part Number: 038 997 016 N HW: 028 101 198 2
Component and/or Version: R4 2,0L EDC G000AG 1388
Software Coding: 0150034
Work Shop Code: WSC 32446 004 1048576
VCID: 290FF0F945EB9202785-5161
1 Fault Found:
16683 - Boost Pressure Regulation
P0299 - 000 - Control Range Not Reached
Freeze Frame:
RPM: 2982 /min
Torque: 218.0 Nm
Speed: 26.0 km/h
Load: 52.5 %
Voltage: 13.98 V
Bin. Bits: 00001000
Absolute Pres.: 2152.2 mbar
Absolute Pres.: 1693.2 mbar
All suggestions for where to look for the issue based on the above data will be humbly appreciated.