2017 Audi Q7 AC not working FIX!!!

Temporary solution to AC compressor not turning on. Common issue: High pressure ac sensor no signal also ambient sensor no signal. Problem fixed by running a wire from the red plug T17b/6 (purple /white) wire inside the car located under the driver side foot rest, to the purple/white wire on the high pressure sensor plug in front of the car.

[@T-programmer]

I was getting exactly the same error codes (b10ae31) (B137a31) (B10bc31) No Signal.... I've been looking at broken wiring for exactly 2 weeks. I fixed the problem today. Open the engine hood and you will see the wiring harness on the upper right side. Buy electrical contact cleaner (Such as WD40 contact cleaner or any brand). Remove the sockets, squeeze them generously in both places. That's exactly the point. Since the sockets are constantly plugged in, hidden corrosion occurs inside after a certain period of time. This prevents the signal and current from flowing regularly.

[@mannysolution]

Thank you for your input I’ll check that plug corrosion when I get a chance.

[@mannysolution]

To be clear, are you talking about the ECU plugs? Or the ones under the ECU?

[@T-programmer]

All cables where the ECU is. There are 2 large cable connections (plugs) there. I took them off their connection and cleaned with Contact Cleaner them and put it back. I just did it and now perfect AC.

[@mannysolution]

@@T-programmer ok got it, thank you!

[@AED-903]

Selam dostum, aracında su alma sorunu mu vardı? Bende aynı sorunu yaşıyorum. Klimayı çalıştırdım ama rear blower’lar çalışmıyor. Tam olarak aracının modeli ve yılı neydi?

[@CornerCamTo]

Hey bro, I've got a couple of quick questions:
1. Where did you route the wiring in the end? Did you create a new hole in the firewall behind the foot cover?
2. I tried removing some of the panels and got the top two off, but the bottom one seems stuck and wont budge at the bottom. Did you have to take off the door sill/foot sill plastic to access it?

[@mannysolution]

Honestly I haven’t route it through the car yet because I haven’t had any time. I just route it through the door and the fender for now but most likely will have to make a whole some where, but My goal is to find the short and fix it correctly.

[@CornerCamTo]

@@mannysolution Fixed it - thanks for the video brother!! I also didn't run the wire properly yet, ran it under the bottom engine covers and then under the door sill. Front AC vents are blowing ICE cold but the rears are not working yet still have that rear blower module code and air quality sensor code. For another day... lol.

[@mannysolution]

@@CornerCamTo no problem man! My rear vent are not working either but I’m happy at least I have ac in the front with the hot days we’ve been having lately.

[@CornerCamTo]

​@@mannysolution Exactly! just happy its working - what I'll be doing next is running a wire from the High pressure sensor to the Air quality sensor - might fix both codes at once. Based on how many people have talked about this looks like a common point of failure.

[@lou4nysq510]

I have a sg5 when I push the AC bottom, the AC light do not stay on. Blows hot air.. going nuts this just happened a few hours ago when it was 102 in NJ..

[@mannysolution]

In my case the ac light was turning on fine. Maybe you’re low on refrigerant

[@CornerCamTo]

Enjoy that Ice Cold air brother!! :)

[@mannysolution]

Yes bro! I’m so happy right now 😄

[@AED-903]

Thank you bro, This explanation is really good. I also own a 2016 Q7 4M. I have been having problems with AC for 2 days. I am getting the following 3 different errors and I will examine the sockets you explained in the video first thing tomorrow. My DTC Error codes are ;
- High pressure sensor, no signal
- Outside air quality/air humidity sensor, no signal
- Rear fresh air blower control module, no signal.

[@mannysolution]

Those are the codes I was having. But after doing this my ac is working except for the rear blowers . I will try to figure out the root of this problem.

[@AED-903]

⁠@@mannysolution The AC worked the way you described, which is great! However, as you said, the rear blowers are not working. Did you find anything else about this? I will continue to work on it. By the way, one last thing: Audi service asked me for 30 thousand euros for this problem, can you believe it? 😊

[@mannysolution]

⁠it’s crazy so many people are having this issue. I will get to the bottom of it one day😅. 30 thousand it’s ridiculous, glad you could fix it for less 😂

[@ilia95rus]

Tu bro! I fix my ac