Question about Volkswagen Passat

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Could a bad throttle body cause a low hum while driving and a turbo underboost error code?

I am getting a low hum and an error code of turbo underboost. my friend checked it with his reader and said when the code was triggered it was going 55mph at 2600rpm and it read the tps at 80%. he said it seemed to be my issue, does the hum and underboost seem to be a possible problem with a bad throttle body?

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  • 549 Answers

Here may be the solution for your VW Passat. Search OBD Codes com

Posted on May 15, 2014

Has to be at a shop that works on turbos

None of the code checking etc, without vehicle
system knowledge, is of any value to you

Throttle Body is not humming

If you can buy factory manuals for lots of money,
maybe you can work on it, when you have trouble charts to follow

Throttle Plate Angle or % is subject to constant change, so unless
your friend knows the vehicle systems, then you wouldn't be here

Posted on May 15, 2014

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 17 Answers

SOURCE: 2001 Ford Explorer Sport Throttle Position Sensor

Hi, Take a little time to check all earth mounts,There are some fine earthwires under the looms running from air intake if one of these is broken or dirty it can cause all the symptoms you describe. All the best. Phil

Posted on Sep 11, 2008

mrgreenz
  • 962 Answers

SOURCE: Tps Sensor low input p-0227

P0227 also indicates the throttle PEDAL position switch control Circuit.Not only the throttle position sensor at the engine.

Posted on Jan 13, 2009

mecanica03
  • 881 Answers

SOURCE: 2001 Acura 3.2 CL Type-S TPS and Map sensor issues...

no need to replace the throttle body , and i think that you make a test before to buy any piece . disconnect the negative battery terminal few minutes, then connnect and start engine again, drive few minutes by observing the engine, if light comes again, replace only map sensor ,good luckl

Posted on Apr 24, 2009

Outofworkjoe
  • 216 Answers

SOURCE: 1993 Volvo 940 error code 232

2-3-2* Fuel trim (lambda control) too lean or too rich at idle }If too rich: high fuel press., leaking injector } various driving problems Fuel trim (lambda control) too lean at idle Oxygen sensor

Posted on Jun 22, 2009

  • 98 Answers

SOURCE: I had a dead battery in my 2005 F-150. I bought a

I think your battery replacement and trouble code are coincidental crazy as it may sound but it happens. Ford came out with a computer update to repair the p0506 problem. This code is a common problem. The only way to fix it is to have your vehicles computer reprogrammed with the update. Either at a Ford dealer or a shop that has the equiptment to do this procedure. Not many shops have this equiptment.

Posted on Oct 30, 2009

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What is code , po299' on mitsubish shogun 2008


the following answer is courtsey of OBD-CODES.com OBD Codes Your OBD-II Trouble Codes Repair Site Home Trouble Codes FAQs Forums Store P0299 Turbo / Supercharger Underboost OBD-II Trouble Code Technical Description Turbocharger/Supercharger "A" Underboost Condition What does that mean? The P0299 DTC code refers to a condition where the PCM/ECM (powertrain/engine control module) has detected that the bank "A" or single turbocharger or supercharger is not providing a normal amount of boost. That could be due to a variety of reasons, which we detail below. On a normally operating turbocharged or supercharged engine the air going into the engine is pressurized and that's part of what makes so much power for an engine of it's size. If this code is set, you will likely notice reduced power output. In the case of Ford vehicles, this may apply: "The PCM checks for a minimum throttle intake pressure (TIP) PID reading during engine operation, which indicates an underboost condition. This DTC sets when the PCM detects that the actual throttle intake pressure is less than the desired throttle intake pressure by 4 psi or more for 5 seconds." Symptoms Symptoms of a P0299 DTC may include: MIL (Malfunction indicator lamp) illumination Reduced power output from engine, possibly in a limp mode Unusual sounds from the engine/turbo There would likely be no other symptoms. Potential Causes Potential causes of a P0299 turbo underboost code include: Intake (induction) air restriction or leak Failed or damaged turbocharger (sticking, binding, etc.) Faulty boost/charge pressure sensor Faulty wastegate bypass regulator valve (VW) Low fuel pressure condition (Isuzu) Sticking turbo nozzle control solenoid (Isuzu) Faulty injector control pressure (ICP) sensor (Ford) Low oil pressure (Ford) EGR system fault (Ford) Variable geometry turbocharger (VGT) actuator (Ford) VGT vanes sticking (Ford) Possible Solutions First off, you'll want to repair any other DTC codes if present prior to diagnosing this code. Start with a visual inspection. Inspect the intake air system for cracks, loose or disconnected hoses, restrictions, blockages, etc. Repair or replace as required. If the air induction system tests OK, then you'll want to focus your diagnosis efforts on the charge pressure control, diverter valve (blowoff valve), sensors, regulators, etc. Really at this point you'll want to refer to a vehicle specific detailed repair manual for specific troubleshooting steps. There are some known issues on certain makes and engines so also check out our car repair forums here and search using your keywords. For example, if you search around, you'll find that a common fix for a P0299 in VWs is to replace or repair the diverter valve or wastegate solenoid. On the GM Duramax diesel, this code may mean the turbo housing resonator has failed. If you have a Ford, you'll want to next check the wastegate regulating valve solenoid for correct operation

Read more at: http://www.obd-codes.com/p0299
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Aug 02, 2015 | Cars & Trucks

1 Answer

Throttle actuator A control system is stuck closed


This sounds like a very dirty throttle body. On the turbo cars it's pretty hard to get to the throttle body for removal and cleaning. I'm not sure about non-turbo.... Either way, a good throttle body cleaning should help out with this code.

Mar 12, 2014 | Volvo S60 Cars & Trucks

1 Answer

VW P0299 engine code


P0299 VOLKSWAGEN - Turbocharger Engine Underboost
Possible causes- Faulty Wastegate Bypass Regulator Valve
- Mechanical damage at Turbo/Super Charger
- Faulty Charge Air Pressure Sensor

Oct 15, 2012 | Cars & Trucks

1 Answer

I have a 2003 VW passat, its reading that cooling and turbo underboosted code, I took it to a shop that handles with foreign vehicles and they are unable to help me, I have chaged everything possible andmy...


There is a boost control valve that can cause problems. It can go bad. It has 3 vacuum hoses attached to it to change vacuum direction to turbo and wastegate valve. The boost control valve can go faulty or stick and not allow boost.

Aug 18, 2010 | 2003 Volkswagen Passat

2 Answers

2001 bug turbo but she just cant speed


will it shut off or just rev? if just shuts off it could be a grounded turbo shaft,bad mass air sensor.remove intake pipe to turbo then check for play or for froze up turbo compressor wheel by moving the comp wheel,check for excess play each way,<>^

Jun 03, 2010 | 2001 Volkswagen Beetle

2 Answers

2004 Honda Civic -Code P0122 Throttle Position Sensor Voltage Low


yes, this is the case of a failed throttle body, in which case it needs replaced, the car is getting too much fuel causing the high idle. this needs replaced asap. you could proably find a small independant honda shop that could do the work for less.

May 12, 2009 | 2004 Honda Civic

1 Answer

1999 volvo s40 2.0 turbo, engine fault caused after hard accelera


well that can be a pain to deal with down unda!


Personally i think the traction control and the stumbles are not related. find out what the check engine light is, and go from there, could be as simple as a coil over, coil or set of plugs/wires or could be a gummed up throttle body, or vacuum leaks, check all the vaccum lines clean the throttle body test drive and , find the code and do some research and or post the code here and i will try to get back to you. a misfire code can be really helpful if it tells you which cylinder, if your over due for plugs just buckle down and replace them.i say
dont throw parts at it because it might not help and get expensive, but cleaning the throttle body and checking vacuum lines, replacing plugs should be preventative maintenance in my book.
use a throttle body cleaner can you can get a local parts store to clean out the throttle body. dont use carb cleaner as it could damage sensors,
if your mind is stuck on the traction control and or you get the stumbling fixed start on that here :

for the hard shifts check the transmission fluid for dark colors or burnt smells. then check out the motor mounts and trans mounts, but that should be done before moving onto the Traction control.

anyways if you suspect the traction control start with checking all the abs sensors. can use a good scanner with live data to save you time and check to see if they are all giving you good readings.
if no scanner is available you need to see if they can be removed from the hub, but be careful as they can break off inside. if they are removable from the hub check them for metal particles and make sure they arnt ground down on the ends, a bad hub will grind down the ends of them. if they look good then let me know
Good luck.

May 18, 2017 | 2002 Volvo S40

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