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Audi A5 Gearbox trouble

  #1  
Old 06-24-2019, 11:09 AM
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Join Date: Jun 2019
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Angry Audi A5 Gearbox trouble

I have a 2013 Audi A5 2.0TFSI Quattro with 89000Km's and a full service history from the dealership (last service done 2000km's ago). About 6 weeks ago I got a warning indicating a gearbox problem but still safe to drive. I opted not to as I didnt want to take the risk. I got home and phoned my local dealer, Audi Centre, and arranged for a flat bed to take the vehicle to the dealer. They used their diagnostic tool and it apparently indicated a problem with the megatronics unit. It was advised that the unit must be replaced. As I had an extended warranty which covered majority of the job I agreed for the work to go ahead. After another 2 weeks the dealership contacted me and said that there was still now an issue inside the gearbox of an mechanical nature which they didn't pick up in the initial assessment. I asked if they can tell me exactly what the problem is and what caused it and they said not without opening the gearbox. They couldn't really tell me how the megatronics unit failed either. Initially it was said it failed as electronic systems may fail, like computers. After the installation of the new megatronics and the persistent problem within the gearbox it was said that mechanical failure caused the problems with the megatronics. I was provided with another estimate of $5000 to fix the gearbox ??? My question is very simple - What caused my Audi with 89000 Km's and maintained as required to have a complete gearbox failure ??? Please can someone shed some light
 
  #2  
Old 06-25-2019, 05:41 PM
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Join Date: Sep 2015
Posts: 14
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Is it a 6-speed S-tronic transmission? VW/Audi has had lots of problems with them in the past, but should be ok by the 2013 model year.

Dealers are incentivized to squeeze every last dollar out of you (especially since they don't make any money on warranty repairs) I'd take the car to an independent mechanic who works on VW/Audi's for a second opinion.

There are four major parts to the transmission. Mechatronics, dual mass flywheel, clutch, and the internal gears. When DMF fails, you can hear a metal rattling in a tin can sound when idling or accelerating. When the clutch fails, it slips or you get harsh shifts. When the mechatronics fail, you get harsh shifts and/or hesitation. It's very unlikely the internal gears are messed up since it's basically a manual transmission design and is quite strong. All but the internal gears can be replaced indepedently without getting a brand new transmission. Most dealers and mechanics only want to replace the whole thing for around $5000 - 6000. More profit and less risk to them of an incorrect diagnosis.

That said, it is possible that the clutch got burned up, and the resulting burnt-off material flowed throughout the transmssion without being filtered out by the filter. When that happens, the metal shavings clogg up the mechatronics so the initial diagnosis is a failed mechatronics. However, if you just pop in a new mechatronics, but the internals are still filled with metal shavings, it would clogg up the new mechatronics and you're back to square one. A good dealer should've seen the metal shavings the moment they opened up the transmission to replace the mechatronics, and should have stopped right there and tell you not to bother replacing the mechatronics.

The 7-speed S-tronic has a dry clutch so it can't containminate the internal fluids/mechatronics.

Have you replaced the transmission fluid religiously or even ealier than required? If regular maintenance was done correctly, with the correct oil and filter, then it may just come down to bad luck. Some S-tronics have overheating problems, but that only occurs if you track the car or are in stop-n-go traffic in very hot weather. And even then, the computer has safety protocols to prevent damage when that happens.

Finally, if your extended warranty covers the mechatronics, it should cover the entire transmission. So you shouldn't have to pay for a new transmission if your warranty covers it.
 
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