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Turbo bypass valve or turbo boost solenoid

Tiny
SGABC
  • MEMBER
  • 2013 VOLKSWAGEN EOS
  • 2.0L
  • 4 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 60,000 MILES
Took my 2013 EOS Komfort car to VW for 60,000 service. The MIL (Service Engine) light was on, and they replaced the Turbo Bypass Valve. 3 weeks later light comes on. Went to AutoZone and it threw a PO299 Turbo/Super Charger Under-boost. Computer recommended a Turbocharger Boost Solenoid. Is this a separate part? If it is, should this have been discovered the first time. The Auto Zone guy said it seems early in the mileage (60,000) to have that issue.
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Saturday, July 18th, 2020 AT 12:39 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,911 POSTS
Hi,

The idea that you just had work done to it leads me to believe something is not attached properly and causing a pressure leak at the charge air system. That is the first thing I would check.

I attached a pic below of the charge air cooling system. I highlighted all the points that should be checked. Also, make sure none of the hoses were damaged or broken.

Let me know what you find.

Joe
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Saturday, July 18th, 2020 AT 4:46 PM
Tiny
SGABC
  • MEMBER
  • 3 POSTS
I checked what I could without a lift. There isn't much access so I could just feel the hose connections and wiggle the hoses to make sure they were attached. I had even less access on the side where hose 14 attaches. That's the side where the battery is mounted. Also, obviously there could be a pinhole in a hose that I wouldn't know about. Complicating matters is my car is parked outside where it's in the high 90's everyday so everything stays hot!
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Sunday, July 19th, 2020 AT 4:00 PM
Tiny
SGABC
  • MEMBER
  • 3 POSTS
I forgot to add that here is more detail that might help from my recent repair when I had my 60,000 check. Here's what the VW Invoice said: Mil on. Found turbo bypass valve leaking and CCV leaking vacuum. Replaced both.
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Sunday, July 19th, 2020 AT 4:05 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,911 POSTS
Hi,

If there are no leaks, the only other that I believe could set this code is a pressure sensor. The charge air pressure sensor can be tested. I will provide the directions and steps. If you feel comfortable doing it, great. If not, let me know.

________________________________________

2013 Volkswagen Eos (1F8) L4-2.0L Turbo (CBFA)
Charge Air Pressure Sensor (G31), Checking

General Description

The Charge Air Pressure Sensor (G31) is located in the inlet to the intake manifold. The Engine Control Module (J623) uses the sensor's signal to regulate the charge air pressure. There is no substitute function in the event of signal failure. Charge air pressure regulation is shut off, leading to a significant reduction in engine output.

Special tools, testers and auxiliary items required

Multi-meter.

Wiring Diagram.

Scan Tool.

Test requirements

Fuses OK.

Battery voltage OK.

Switch OFF All electrical and electronic accessories.

Vehicles with Auto. Transmission, ensure Selector Lever position is in "P".

Vehicles with Manual Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.

Coolant Temperature: greater than 80° C.

Observe all safety precautions: [Safety Precautions ] See: Computers and Control Systems Technician Safety Information Generic Scan Tool.

View clean working conditions: [Clean Working Conditions ] See: Computers and Control Systems Technician Safety Information Generic Scan Tool.

For Hybrid vehicles refer to: [High Voltage System General Warnings ] See: Engine Technician Safety Information High Voltage System General Warnings.

Test Procedure

see pic 1

see pic 2

____________________________

See pic 3 for charge air pressure sensor location.

___________________________

Let me know what you find.

Joe
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Sunday, July 19th, 2020 AT 8:26 PM

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