S-Tronic 'Issue'

3.0 V6 24v TFSI - 329 bhp
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Dr_Rick
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S-Tronic 'Issue'

Post by Dr_Rick » Fri Nov 27, 2015 12:18 pm

Been on the forum since July when I picked up my S4, but haven't really contributed much yet. Now I'm noticing something with the car and figured I'd ask those in the know.

Bit of background first I think. Car is an 09-plate (2009) S4 saloon that I picked up in July with 72k on the clock. As part of the deal I had the indi dealership do a gearbox oil change for both gearbox and mechatronic units. The car had been serviced about that time separately too. Right now, it's sitting with just over 77k and I do around 65miles per day, 5 days per week for commuting on the motorways (Edinburgh to Glasgow effectively). Car is standard without DRC or Adaptive Steering.

So, to the 'issue'. I've noticed more recently that when coming to a halt at the lights, typically first thing in the morning and when the car is cold, I get a jolt when the car downshifts from D2 to D1. I'm usually stationary when it happens (about 0.5s after actually stopping). It doesn't happen if I'm using the flappy paddles and already in D1. I use the Hill hold to keep the car from moving in these sort of situations to save blinding the person behind with the brake lights.

During the day the car doesn't move, and the return commute doesn't really have the start stop with lights and roundabouts when the car is cold as I leave Glasgow and may not encounter stationary traffic until the outskirts of Edinburgh so the car is properly warmed up by then.

Given it only happens in full auto, my gut feeling is some sort of software issue as the changes are smooth in manual and the Hill hold transitions are fine. I don't think it could be the mechatronic unit itself as I would have thought that the actuators would cause jip in both manual and auto if they were starting to die.

I'd get it into Audi, except that their £60 diagnostic for an hour initial offer was swiftly replaced with a 'We need it for 5 hours and after the first hour our rates go up to £100+', so it would be nearly £500 or a checkup. I have an RAC Warranty (came with the car), and I've got it booked in to a local specialist for a look-see on Monday, but does anyone have any thoughts?
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Ian_C
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Re: S-Tronic 'Issue'

Post by Ian_C » Fri Nov 27, 2015 2:45 pm

Wasn't there a software patch for the early cars to improve 1st to 2nd (and 2nd to 1st) gearchanges? I'm sure Chris Harris mentioned it during one of his early ownership videos of his 2009 ex press car? I'd just take it in for a service and ask Audi to make sure all the recalls have been done (plastic water pump housing, Sat Nav bug update, gearbox software update if applicable)
B5 B6 B7 B9

Dr_Rick
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Re: S-Tronic 'Issue'

Post by Dr_Rick » Fri Nov 27, 2015 2:51 pm

I did ask if there were any 'outstanding' items applicable to my car when I spoke to the service booking people. They said it had had two recalls, but none on the gearbox side. I think one was a rear light unit and I forget the other, but it wasn't really relevant. I know I've got an MMI / satnav update available once I get some spare time and the hidden menu's unlocked by a colleague.

sebgreen
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Re: S-Tronic 'Issue'

Post by sebgreen » Sat Nov 28, 2015 2:04 am

The 2-1 gear change bump is just a characteristic of the gearbox I think.

Dr_Rick
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Re: S-Tronic 'Issue'

Post by Dr_Rick » Mon Nov 30, 2015 9:32 am

Really, so why should it only happen in full auto and not when on the paddles?

I also have a fault logged for the gearbox:

8962 - Clutch 2
P17D7 00 [096] - Pressure too High
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame

Any ideas?

Dr_Rick
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Re: S-Tronic 'Issue'

Post by Dr_Rick » Tue Dec 01, 2015 7:01 pm

So, Adaption done. A run from Edinburgh to Perth tomorrow will tell as to whether it has improved things

sebgreen
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Re: S-Tronic 'Issue'

Post by sebgreen » Thu Dec 03, 2015 8:53 am

Check out this thread - the error seems to be the same and this is how is has been fixed. Sensor failures
viewtopic.php?t=112191

The 2-1 thump does not happen in manual or s mode, but they did release a software updates which changes the timings so it is less obvious. Just a characteristic of the gearbox when in D

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