Failure to communicate...

awdinut · 04-22-2012, 10:27 AM

2000 A8 L is not communicating with the VAG COM. Trans is going into 'limp mode' frequently, but have no idea whats wrong becuase the code(s) can not be read. Anyone ever had a car not communicate ? What are the possible causes of non-communication ?!

silverd2 · 04-22-2012, 12:52 PM

Have never had the problem (non-communication or limp mode) but there is a fuse for the diagnostics...#9 top row, 10 amp. Would also want to look at the OBD port wiring, esp if the driver's knee panel has ever been removed. Next, I'd wanna look in the E-box (fresh air plenum) for any evidence of water intrusion.

Just guesses, but the progression I'd personally follow.

dallas0029 · 04-22-2012, 12:52 PM

Do you have an aftermarket stereo installed?

awdinut · 04-22-2012, 02:49 PM

Quote:

Originally Posted by dallas0029

Do you have an aftermarket stereo installed?

Added a DVD player (that plays audio through the radio) in the glove box, an XM reciever hard wired to the Euro AUDI NAV PLUS RNS-D that I installed inplace of the US market radio. That was several years ago, and I will say that at some point after those installs I started having some intermitent non-communication, but now it has lasted for months.

04-22-2012, 12:52 PM	#2
silverd2 AudiWorld Senior Member Garage is empty, add now Join Date: May 2010 Location: East TN Posts: 1,570	Have never had the problem (non-communication or limp mode) but there is a fuse for the diagnostics...#9 top row, 10 amp. Would also want to look at the OBD port wiring, esp if the driver's knee panel has ever been removed. Next, I'd wanna look in the E-box (fresh air plenum) for any evidence of water intrusion. Just guesses, but the progression I'd personally follow. __________________ Mine: '01 A8 SWB Hers: '03 Allroad 2.7T Dog's: '90 Passat wagon

04-22-2012, 12:52 PM	#3
dallas0029 Audiworld Junior Member 1997 Audi A8 Join Date: Sep 2011 Location: Sydney Australia Posts: 24	Do you have an aftermarket stereo installed? __________________ Audi A6 1995 (sold reason i bought the A8) Audi A8 1997 Love it VW Polo 1.2 TSI 2012 Triumph Tiger 800 Love it Range Rover 1997 sold

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04-22-2012, 02:49 PM
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