2013 S5 3.0T - DTC P2004/5: Intake Manifold flap stuck open

[Markie93]

Good morning guys,

I have a 2013 Audi S5, 3.0T, just rolled over 120,000 miles and bone stock. I started it up this morning and noticed a check engine light. I haven't changed or adjusted anything that would have caused anything to change. Code indicated BOTH intake manifold flaps are stuck open. What would cause these both to fail at the same time?

Has anyone had this issue or have any suggestions on where to start?

Scanned it with VCDS and found the following:

2 Faults Found:
6425 - Intake Manifold Flap; Bank 1
P2004 00 [175] - Stuck Open
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 2
Mileage: 193205 km
Date: 2021.03.11
Time: 16:13:58

Engine RPM: 1333.00 /min
Normed load value: 22.0 %
Vehicle speed: 79 km/h
Coolant temperature: 91 °C
Intake air temperature: 16 °C
Ambient air pressure: 980 mbar
Voltage terminal 30: 14.624 V
Unlearning counter according OBD: 40
Engine speed: actual: 736 /min
MAF_ENVD: 92.60000 mg/stroke
Coolant temperature (unfiltered): 60.00 °C
Engine: operating status: IS
V_PORT_1_ENVD: 3.57422 V
Vehicle speed: actual: 0 km/h

6426 - Intake Manifold Flap; Bank 2
P2005 00 [175] - Stuck Open
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 2
Mileage: 193205 km
Date: 2021.03.11
Time: 16:13:58

Engine RPM: 1333.00 /min
Normed load value: 22.0 %
Vehicle speed: 79 km/h
Coolant temperature: 91 °C
Intake air temperature: 16 °C
Ambient air pressure: 980 mbar
Voltage terminal 30: 14.624 V
Unlearning counter according OBD: 40
Engine speed: actual: 736 /min
MAF_ENVD: 92.60000 mg/stroke
Coolant temperature (unfiltered): 60.00 °C
Engine: operating status: IS
V_PORT_2_ENVD: 3.61328 V
Vehicle speed: actual: 0 km/h

[ENV²]

Probably needs a carbon cleaning


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[prabkaler]

It’s possible that the runner flaps on one of the manifolds broke or are seized. You won’t know for sure until you pull the supercharger and inspect


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[Fastmat]

I got the same codes on my 2013 B8.5 S5 (V6 Supercharged) after an electrical issue (loose wire on the starter)
The code was due to the solenoid control valve on the vacuum system that burnt up and was not activating the manifold runner valves.
I was also getting a load signal from generator circuit DF short to ground message (no code).

The part number for the solenoid is*079906283D or the previous revision*079906283B. Seems to me both are the same.

I also changed out the other solenoid on the same line that is next to it and that controls the EGR vent valve, but changing only that one did not fix the P2005/P2004 issue.
Part#:*037906283C

Audi stealership and my local Import shop were asking for 5.7 hrs of labor to just diagnose this code (removing and reinstalling the supercharger). It took me a lot of research on the web to get to understand the way the vacuum system works and find the correct solenoid part #s but once this was done, they are very accessible and easy to change (below the audi rings engine cover).

https://audi.7zap.com/en/rdw/audi+a5.../1/133-133062/
This diagram shows them as #5 and says both solenoids are the same but it's not correct. The one on the right is*037906283C and the one on the left is*079906283D/B. They use different shapes plugs to connect to them.*

It's not easy to find info on this DTC code on the 3.0 T as it does not seem to happen very often.

Thought I would share with my fellow Audi 3.0T owners to help them avoid a very big shop bill.
parts on ebay were 21$ each
cheers
​​​​​​​Mathieu