Passat low boost issue P0299

   #1  

Rockfiend

Verified VCDS User
Verified
Joined
May 21, 2015
Messages
4
Reaction score
0
Location
UK
VCDS Serial number
C?ID=247661
Hi, i have a 2009 Passat 2.0 CR TDI (CBAB) 140 with a low boost issue. Serviced the car last week replacing all filters. After driving 400 miles over a few days, glow plug light and engine fault showing on dash. Straight into limp mode, reduced power etc. Switch off/on and some power was restored but still low. Scanned with VCDS and threw up the code as below.



Address 01: Engine Labels: 03L-906-022-CBA.clb
Control Module Part Number: 03L 906 022 QC HW: 03L 907 309
Component and/or Version: R4 2,0L EDC G000SG 3732
Software Coding: 0000072
Work Shop Code: WSC 00700 210 88118
VCID: 76E3ADA101284A8E77-8022
1 Fault Found:

000665 - Boost Pressure Regulation
P0299 - 000 - Control Range Not Reached - MIL ON
Freeze Frame:
Fault Status: 11100000
Fault Priority: 2
Fault Frequency: 3
Reset counter: 255
Mileage: 144625 km
Time Indication: 0
Date: 2012.14.05
Time: 13:55:27

Freeze Frame:
RPM: 2530 /min
Speed: 64.0 km/h
Load: 56.9 %
Absolute Pres.: 2131.8 mbar
Absolute Pres.: 1632.0 mbar
Lambda: 97.8 %
Lambda: 37.1 %

Had a quick look at the vacuum pipes etc but as i was away for the weekend couldnt do much. Driving home the light came on a few times and went into limp mode. Switched off and on again and some power was restored, still low on power but driveable. Doesnt seem to be any boost down low but up the rev range around 2500, it definitely seems to pull well. Seen lots of posts about the actuator issues. Thinking it might be this. Today when i got in the car, the brake pedal was hard after i started up to release e brake. The pedal feel was restored after a few seconds. This would mean i probably have a vacuum leak. I cant hear anything obvious again making me think its the actuator. I have ordered a vacuum tester and will see if it holds when i get it.
I have also graphed actual boost against specified boost and it appears to be well short. This i think indicates its not a map sensor?

Code came up again this morning but now says intermittent.

Any advice greatly appreciated.
 
Last edited:
   #2  

Rockfiend

Verified VCDS User
Verified
Joined
May 21, 2015
Messages
4
Reaction score
0
Location
UK
VCDS Serial number
C?ID=247661
Sorry, cant figure out how to post the boost graph or any attachment. :(
 
   #4  

Rockfiend

Verified VCDS User
Verified
Joined
May 21, 2015
Messages
4
Reaction score
0
Location
UK
VCDS Serial number
C?ID=247661
FZQbZqw.png
 
Last edited by a moderator:
   #5  

Uwe

Benevolent Dictator
Staff member
Joined
Jan 29, 2014
Messages
33,227
Reaction score
23,699
Location
USA
VCDS Serial number
HC100001
Yep, you have practically no boost.

I don't know that engine well enough to speculate why.

-Uwe-
 
   #6  

Jack@European_Parts

Gone But Not Forgotten
Joined
Jan 29, 2014
Messages
21,923
Reaction score
9,262
Location
Montgomery, NY, USA
VCDS Serial number
C?ID=57337
How about a charge pipe or loose connection.

Faulty WG or N75

Visual inspection of the pipes......... cooler and tug tests are advised
 
   #7  

dafrazi

Verified VCDS User
Verified
Joined
Feb 26, 2014
Messages
130
Reaction score
94
Location
Norristown, PA
VCDS Serial number
C?ID=173774
Wires at the N75 valve are a common failure point. Make sure to inspect them. I've seen a bunch broken at the connector on the N75.
 
   #9  

Rockfiend

Verified VCDS User
Verified
Joined
May 21, 2015
Messages
4
Reaction score
0
Location
UK
VCDS Serial number
C?ID=247661
Thanks for all the replies. I have verified all the intercooler and vacuum pipes complete. No damaged wiring at the n75 as suggested. After these tests completed, my vacuum tester arrived. I quickly checked the n75 and pipes. I'm getting vacuum from the n75 but no vacuum being held by the actuator. I guess the actuator diaphragm is bust? Short is I've ordered an actuator for delivery tomorrow. Hoping this will sort it out.

Thanks all for reading and replying. 😊
 
Top