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6hp19 Reverse dodgy

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Hi guys.  I've got an odd issue in that when the car has been driven for a while, engaging reverse seems to be very weak and will sometimes slip, giving the red cog of death.  Sometimes, turning off and on again gives reverse again, but not always.

 

When driving from cold, reverse is never an issue.  I had the gearbox oil and pan changed about 10k ago, maybe less.

 

Any ideas?

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Could be anything.  Needs codes read to see if the gearbox has fired off one of the clutch pack error messages which result in the, as you say, red cog of death.

 

What mileage is on the car/box?

 

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At that mileage BMW will tell you it's beyond its life time.  Doesn't mean anything is wrong with that though.

 

Dont know the codes off the top of my head but if there is a code it should be listed under the gearboxes own control unit. I don't know much about how to read codes other than pay my local Indy £35 to read them.

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That's a bit scary only 10k after a gearbox service. I've read somewhere on the forum about some non-BMW plastic gearbox sumps warping and leaking fluid. Wonder if it's something like that?

Sent from my Vodafone Smart ultra 6 using Tapatalk

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It started doing it at 99k, but because the car had been serviced at a non BMW dealer, they wouldn't even entertain the idea that it was faulty from manufacture.  They wanted IIRC 2.5k for a new gearbox plus £800 for the oil.  They must have been expecting me to say yes as when I told them that I would just take my car home, it took them an hour before they would release it back to me.  It drove fine home.  Reverse worked.  I took it to a gearbox specialist who is no longer in existence and his response was "Back again?"  Apparently, BMW had taken my car to him to diagnose and he was going to fit a recon gearbox for £1100.  When i went to collect my car, it was stripped down, which is why it took so long.

 

Fast forward 45k miles later and reverse feels weak, so I bought a kit frome ebay.  It was supposedly a proper filter and lifeguard 6 oil as I had heard about the cheap chinese junk and wanted a proper kit.  It was about £300 iirc.

 

Anyway, recently, there has been a smell of burning oil when I've driven up a slope, although no big puddles of oil under the car and I can't see any obvious leaks.  Do I get a filter and sump from BMW and get the oil changed again or is it a new mechatronic because reverse comes back once the engine is switched off and on again?

 

Failing that, does anyone know an auto specialist near Swansea?

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Sounds like you've been through the mill a bit. Have you read through the thread below as thus gearbox specialist has had some good reports from members? It's a bit of a trek, but may be worth it if they can offer a solution. Certainly worth a chat with them

http://forum.bmw5.co.uk/index.php?/topic/122086-Automatic-Transmissions-Preston---Thumbs-up!#entry1316347

Sent from my Vodafone Smart ultra 6 using Tapatalk

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Get under the car and see if it is properly leaking (mine had some moisture before doing but not leaking).  They are very sensitive to oil level so if a specialist has not done this procedure correctly it may cause your grief.  Mine quoted 60 to 70 quid if you just want your fluid topping up to the right level I'd start there perhaps.  

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Smell of burning from an autobox is never a good sign.  That implies that you are burning friction material which could be a clutch which may explain the weak reverse, i.e. the clutch is slipping.  Clutch could be slipping because it is low on fluid or a million and 1 other things.  Needs a proper look at, not just a sump drop and oil change.

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36 minutes ago, pidgeonpost said:

 

Sounds like you've been through the mill a bit. Have you read through the thread below as thus gearbox specialist has had some good reports from members? It's a bit of a trek, but may be worth it if they can offer a solution. Certainly worth a chat with them emoji4.png

http://forum.bmw5.co.uk/index.php?/topic/122086-Automatic-Transmissions-Preston---Thumbs-up!#entry1316347

Sent from my Vodafone Smart ultra 6 using Tapatalk

 

What he's said ! Speak to James he will know exactly what is wrong with it! Good luck! Gearbox problems don't come cheap! 

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Hi guys ,

 

As we`ve been mentioned in the post thought it only polite to offer some assistance to your woes .

 

Crucially you have 156k of wear in the bushings and valve body and we feel that is where your problem lies .

 

Changing the oil and filter on any automatic gearbox is a positive step forward to longevity .

 

Don`t go changing yours again hoping it will cure your problem , it won`t .

 

The rear stator bush seals the apply oil for the E clutch but often overlooked is the bushing in the front of the E clutch drum itself which seals lubrication oil.

 

This reduced pressure affects the balance oil pressure .

 

Reverse sees clutches B & D applied ;

 

 B is also on in 3rd and 5th   & transmits the power flow

 

 D is on in Park , Reverse , Neutral and 1st to hold the planet set stationary .

 

You don`t complain of any problems in these other gears so you need to look at the apply circuit for reverse .

 

The accumulators will have flattened out at that mileage , the solenoid regulator valve circuit will have advanced wear in its bore ,

the case tubes will have shrunk and not be doing their job properly sealing the valve body to case correctly , similarly the bridge seal etc.

 

Hope this brief tutorial helps , good luck .

 

 

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2 hours ago, AutomaticTransmissions said:

Crucially you have 156k of wear in the bushings and valve body and we feel that is where your problem lies 

 

I have read that BMW say that the lifetime of the box is 120,000 miles.

 

I have heard of the bigger 6hp26 box failing at just over 91,000 miles having been serviced twice in its lifetime so having 156,000 miles on a box is good in my experience!

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3 hours ago, AutomaticTransmissions said:

Hi guys ,

 

As we`ve been mentioned in the post thought it only polite to offer some assistance to your woes .

 

Crucially you have 156k of wear in the bushings and valve body and we feel that is where your problem lies .

 

Changing the oil and filter on any automatic gearbox is a positive step forward to longevity .

 

Don`t go changing yours again hoping it will cure your problem , it won`t .

 

The rear stator bush seals the apply oil for the E clutch but often overlooked is the bushing in the front of the E clutch drum itself which seals lubrication oil.

 

This reduced pressure affects the balance oil pressure .

 

Reverse sees clutches B & D applied ;

 

 B is also on in 3rd and 5th   & transmits the power flow

 

 D is on in Park , Reverse , Neutral and 1st to hold the planet set stationary .

 

You don`t complain of any problems in these other gears so you need to look at the apply circuit for reverse .

 

The accumulators will have flattened out at that mileage , the solenoid regulator valve circuit will have advanced wear in its bore ,

the case tubes will have shrunk and not be doing their job properly sealing the valve body to case correctly , similarly the bridge seal etc.

 

Hope this brief tutorial helps , good luck .

 

 

 

Do you rebuild valve bodies, for example using Sonnax zip kits?

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2 hours ago, 535iAR said:

 

I have read that BMW say that the lifetime of the box is 120,000 miles.

 

I have heard of the bigger 6hp26 box failing at just over 91,000 miles having been serviced twice in its lifetime so having 156,000 miles on a box is good in my experience!

 

I'm hoping mine will get to 200k ... currently 132k.

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15 minutes ago, Tuvoc said:

Got it serviced straight away when I bought it at 105k miles.

 

Very good, that is beyond a known (to me) failure.  Suspect though that after the first service, the box I knew that failed was not fully filled with oil. It was dry underneath but having read what I've read now I suspect that the specialist didn't fill it full enough when it was first serviced.

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Yes, 105k miles was too long of course, should have been done earlier by the previous owner, but hopefully that change will have extended its life. That fact that I've done 27k miles since then shows that the box hasn't reacted badly to the change anyway at least.  Mind you, there are people running boxes at over 200k miles who have never changed the oil, so longevity seems to be a bit of a lottery. Perhaps more dependent on how the car has been driven rather than if or when the oil has been changed.

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20 hours ago, jake13 said:

 

Do you rebuild valve bodies, for example using Sonnax zip kits?

Yes, we do rebuild valve bodies; some with sonnax zip kits, some from other suppliers. What you have to remember is that a 'fix kit' is to mask the original cause by supplying an alternative cure. 

 

40+years of experience has taught us to address the root cause first, to prevent costly comebacks.

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I think I jump on to this as well. My 530d has got 73tm on the clock and I had a slipping reverse to. Car still has manfac guarantee as only 6y old. Any suggestions as I'm going for a service next?

Cheers

Alex

Sent from my PLK-L01 using Tapatalk

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My autobox had a similar burning issue and throwing the cog, but seemingly was due to a leaking sump and low oil pressure.  Had that all fixed and refilled and the transmission is ok but not perfectly smooth, but at 172K, I'm not complaining too much...

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