K Line Short to Ground Fix

If your OBD2 scanner isn’t connecting to your car’s internal diagnostics, it may be due to a K1 or K2 line short to ground. Here is a good way to troubleshoot what’s causing the problem.
My car is a 2003 Audi TT Quattro, but many other OBD2 enabled cars will have a similar setup, especially Volkswagen/Audi brand.
One of those wires will be the one that loops back into the main loop to go to the OBD2 port, so be sure and leave that one connected the whole time. After you’ve identified the troublesome K line, you can find out which module it came from by connecting to VCDS and seeing which module you can’t connect to anymore. You can either replace the faulty module if it’s essential (ECU, ABS, etc) or you can just leave that particular K line disconnected if you haven’t noticed any other problems. You can then twist the good K line wires back together and secure them with a twist cap and redo the wiring sheath as well.

[@glacialmoraine]

This enabled me to diagnose it in 5 minutes after spinning my wheels for 4 hours unplugging modules! You rock, thank you!

[@castlebravo19]

glacialmoraine glad it helped!

[@jaydenwinson]

Mate you’ve literally just saved my life, you absolute legend, if you were in the UK I’d be sending you a bunch of beers rn😂😂😂😂😂😂 thanks again mate!

[@castlebravo19]

Jayden Winson you’re welcome!

[@hervegautier832]

Excellent... I was so happy to discover your video as I was wondering how I was going to check each module...

[@raulbotero982]

Excelent video.

[@kayulamulenga1889]

I have a similar problem with my audi b6 hope the k line wiring is the same

[@BB-sn4vc]

Absolutely top. Thank you very mutch

[@lewisnisbet5328]

Thankyou your a legend were u having terminal 30 codes ? Ive got a mk5 gti showing steering wheel and ignition terminal 30 codes

[@EMFRocks]

Awrsome thanks for sharing.

[@castlebravo19]

You’re welcome!

[@quattroed9433]

you legend, this will save me a TON of time

[@castlebravo19]

Quattro Ed you’re welcome!

[@touaregturkiyeturkey7702]

Does the K line have a junction with other modules?

[@jamiereynold]

Ive had this problem on my car for about 5 months now and ive been watching another video pretty similar to this and the guy pulls out all the kline wires like you have and me i have no bunch off wires like you have please help me

[@martinmtz1969]

Hi , where you get it the OBD2 short checker

[@castlebravo19]

I forget where I got mine, probably Amazon, but there are a lot of models that do the same thing. Any OBD2 scanner should do the trick.

[@oorangejuce]

Um.ok i'l go and try this.