# Service bulletin TT 21\-10\-01

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10124481
- Published by NHTSA: 2017\-12\-05
- Manufacturer's number: TT 21\-10\-01
- Manufacturer's date: 2014\-08\-29
- NHTSA component: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER

## NHTSA's summary

Tech Tips 92006\-2014 Vehicles with 2.0T Gasoline Engine \- N75 Solenoid Valve Diagnosis\): When diagnosis on the above engine leads to the testing of the N75, please refer this document with graphical aid. The diagram shows which vacuum ports on the N75 valve should hold vacuum and which ones should not. Turbocharger fault codes P0299 and P0234 can be diagnosed using this test.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2014/MC-10124481-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2014/MC-10124481-0001.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Turbocharger or supercharger

## Trouble codes named

P0234, P0299

## Vehicles listed

- 2012 to 2013 VOLKSWAGEN BEETLE
- 2009 to 2011 VOLKSWAGEN CC
- 2012 VOLKSWAGEN CC
- 2013 VOLKSWAGEN CC
- 2014 VOLKSWAGEN CC
- 2006 VOLKSWAGEN EOS
- 2007 to 2013 VOLKSWAGEN EOS
- 2010 to 2014 VOLKSWAGEN GOLF
- 2006 to 2009 VOLKSWAGEN GTI
- 2006 to 2010 VOLKSWAGEN JETTA
- 2012 to 2014 VOLKSWAGEN JETTA
- 2008 VOLKSWAGEN JETTA SPORTWAGEN
- 2009 VOLKSWAGEN JETTA SPORTWAGEN
- 2006 to 2010 VOLKSWAGEN PASSAT
- 2010 VOLKSWAGEN PASSAT WAGON
- 2006 to 2009 VOLKSWAGEN RABBIT
- 2008 VOLKSWAGEN TIGUAN
- 2009 to 2014 VOLKSWAGEN TIGUAN

## Other bulletins for the same vehicles and component

- [TT901401](/bulletins/10252218.md), 2024-04-01, Service bulletin: ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. Beetle Turbo\-Oil Temperature Gauge Operation
- [TT200906](/bulletins/10238954.md), 2023-07-10, Service bulletin: FUEL SYSTEM, GASOLINE; ENGINE AND ENGINE COOLING:ENGINE:DIESEL; FUEL SYSTEM, DIESEL; ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. Use the diagram below to test the N75 Solenoid Valve in the event of a turbocharger fault code such as P0299 or P0234. This applies to Mechanical Injection Style Diesel Engines, Pumpe Duse Style Diesel Engines and the new Common Rail Style Diesel Engines.
- [971403](/bulletins/10238512.md), 2023-07-05, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER; ELECTRICAL SYSTEM:WIRING. Increased resistance at the pins of the T14 connector in the engine wiring harness, causing fault code P0236 Turbocharger Boost Sensor \(A\) Circ. Range Performance.
- [971402](/bulletins/10238511.md), 2023-07-05, Service bulletin: ELECTRICAL SYSTEM:WIRING; ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. Increased resistance at the pins of the T14 connector in the engine wiring harness, causing fault code P0236 Turbocharger Boost Sensor \(A\) Circ. Range Performance.
- [TT 21 18 01](/bulletins/10150857.md), 2018-12-10, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER; ENGINE AND ENGINE COOLING:ENGINE:OTHER FUEL TYPES:TURBO/SUPERCHARGER; FUEL SYSTEM, GASOLINE:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS. Incorrect removal of Turbocharger oil feed line may cause engine damage
- [V211703 2041965](/bulletins/10127861.md), 2018-02-05, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. Update to metadata TB displayed with tech tips.
- [TT 21\-13\-01](/bulletins/10125837.md), 2017-12-14, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. Tech Tips \(Equipped with Turbocharged Engine Turbocharger Replacement Tip\): If mechanical damage is found to the turbocharger \(e.g. damaged compression wheel, loose or broken shaft\), it is not enough to just replace the turbocharger. This document informs the procedure of checks for damage.
- [TT 20\-09\-06](/bulletins/10124482.md), 2017-12-05, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER; FUEL SYSTEM, DIESEL. Tech Tips \(TDI Engine \- N75 Solenoid Valve Diagnosis\): This document informs with graphical aid the testing of the N75 Solenoid Valve in the event of a turbocharger fault code such as P0299 or P0234. This applies to Mechanical Injection Style Diesel Engines, Pumpe Duse Style Diesel Engines and the new Common Rail Style Diesel Engines.
- [V151401 2015153](/bulletins/10124300.md), 2017-12-05, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:OTHER FUEL TYPES:TURBO/SUPERCHARGER. Technical Bulletin \(Fuel Rail / System Pressure, Fuel Trim, and Fuel Pressure issues\): This document informs of Excessive wear of intake camshaft lobe that drives the high pressure fuel pump. The wear limits maximum pump piston lift, causing fuel rail pressure fluctuations. The wear on the camshaft lobe can also lead to wear on the base of the high pressure fuel pump cam follower. The product solution for this issue was to Increase surface hardening of camshaft lobe for the high pressure fuel pump.
- [V231402 2036656](/bulletins/10124296.md), 2017-12-05, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:OTHER FUEL TYPES:TURBO/SUPERCHARGER. Technical Bulletin \(No Start, or Rough Running issues\): When diagnosing a MIL ON, no\-start or rough running concern on a common rail diesel vehicle, and no root cause is found after following all GFF diagnostic procedures, it may be necessary to check for metallic particles in the High Pressure Fuel Pump. If such an inspection is necessary, the guidelines in this document must be observed when removing the N290 Fuel Metering Valve

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