2000 2.7t A6 no communication at OBDII

[AutoIveL]

Long story short, car sat for a year and a half before diagnosing no start/no crank as an electrical issue. Since then (about 7 months/7k miles), I've had no luck getting any sort of scan tools to connect. I don't think it's a bent pin or anything? Possible ECU issue? FYI, abs module dead and check engine light has been on since I've owned the car lol. Last I remember scanning were codes for cats and/or O2 sensors.

[audinutt]

unplug the electrical connector to the Abs module you skiing then be able to connect to the ECU

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[AutoIveL]

unplug the electrical connector to the Abs module you skiing then be able to connect to the ECU

Sent from my SM-N900V using Tapatalk

thanks will do! Any chance this will hide dash alerts too? Any harm in leaving it unplugged long-term?

[Grainreaper]

This might be a dumb question, but have you checked every fuse? Not Audi specific but in general most cars have fuses that singly protect multiple circuits, an example (from a Kia Optima) is a fuse labeled "memory" is also part of audio system, Pom lamps, illuminated sill plates, and push button start... of water shorts out a sill plate LED, the memory fuse pops and then the car won't start... a no start caused by a memory fuse that blew because of a sill plate.

That was convoluted, but most OBDII port power feed wires are fused but not always labeled as such. A blown fuse can kill the OBDII port resulting in no communication, the fact that the CEL is on and it starts and runs sort of rules out a failed ECU in my mind