Sport differential system fault

[OfficialFonzie]

I got a warning on my dash saying “sport differential system fault”. I scanned the car using the OBDeleven and I got the code “C100313” and it says “Audi all wheel drive pump open circuit”. I noticed that I hear a whining/grinding noise coming from the diff whenever I’m on the gas but when I let off I hear a mild drone as the car slows down. Any ideas on what’s going on or what part that needs to be replaced?


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[hunter_killer]

I’d say with the differential noises you’re listing and a “sport diff light” that the rear is diff is gone by now. You’ll have to find a good used one to replace yours. Far as I know there’s no rebuild kits for these.


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[Alabama]

I got a warning on my dash saying “sport differential system fault”. I scanned the car using the OBDeleven and I got the code “C100313” and it says “Audi all wheel drive pump open circuit”. I noticed that I hear a whining/grinding noise coming from the diff whenever I’m on the gas but when I let off I hear a mild drone as the car slows down. Any ideas on what’s going on or what part that needs to be replaced?

Possibly too late, but consider not driving it anymore until the problem is sorted out.

[MattyMarkey]

I’d say with the differential noises you’re listing and a “sport diff light” that the rear is diff is gone by now. You’ll have to find a good used one to replace yours. Far as I know there’s no rebuild kits for these.


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There is a rebuild/repair kit that includes a new pump and seals, but that likely isn’t the problem based on the OPs statements. Kit for reference - https://parts.audiusa.com/a/Audi_2014_S6/68849587__6226180/REAR-SUSPENSION-AXLE--DIFFERENTIAL/1353727.html#5

It could be the sensors that are on the diff, but with the grinding noise, it doesn’t seem likely as well. When mine failed, it almost sounded like a bad wheel bearing; only making noise when turning the corner while applying throttle.


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[OfficialFonzie]

Thanks for the info, going to see if I can get my hands on a used one for now. Those things are expensive.


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[Valpo A7]

www.car-part.com to help with the used search. Its a nationwide junk yard search engine.

I just looked and got best results by looking for CARRIER. They specify torque vectoring or non torque vectoring