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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > 6 speed manual won't go in reverse



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      02-03-2015, 07:20 PM   #1
nynyny
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Exclamation 6 speed manual won't go in reverse

Well, I haven't found too much on this topic...


I back out of my spot at work. (It works fine at this point)

I drive home.

I pull into my parking spot... then I go to straighten out and when I try to shift into reverse... it doesn't catch. Like, it seemed like the clutch wasn't depressed all the way. Pretty sure I heard a slight grinding.

I pull forward a little more... it doesn't catch. I turn the car off... it will not shift into reverse.

In the end I have a friend push the car out of the spot so I can drive around a bit... still the same story.

TL.DR- My manual transmission will not shift into reverse gear. It can engage all the other gears without trouble...

2011 335xi
6 speed manual

It was also cold today... but nothing out of the ordinary for a NY winter...

Any thoughts? I mean... I don't think gears can freeze, right?

Last edited by nynyny; 02-03-2015 at 08:34 PM.
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      02-03-2015, 07:28 PM   #2
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On a cold day my reverse has caused some grinding (despite full clutch pedal engagement), but does engage. Seems like a similar problem but with worse symptoms.

2007 E90 323i 6MT (2.5L N52)

Curious if any one else has any insights or suggestions
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      02-03-2015, 07:33 PM   #3
WilliamS
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The synchros may not like the cold, but driving around a bit should have put some heat into the transmission so I dont think it would be that but anything is possible.
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      02-04-2015, 12:15 PM   #4
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Well, dropped it off at the dealer this am... of course this is their busiest time of year and they don't even know when they'll be able to do a diagnosis... so who knows how long I'll be without my car. Very sad.

I really hope its something simple... maybe linkage?

The real kicker was when my SA said "Ya, this SHOULD be covered under CPO' (gulp)
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      02-04-2015, 12:26 PM   #5
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2011 MY and onward CPO is a full extension of new car warranty so I don't see why this will not be covered under.
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      02-05-2015, 02:48 PM   #6
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Quick update-

The dealer called and said it appears to be the transmission. They have to lower it (?) and have a better look...

Does anyone have any ideas how this could have happened?? I am an experienced manual transmission driver and do not abuse my car in any way...
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      02-05-2015, 03:57 PM   #7
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Seems like a worn/defective reverse synchro... I had it happen on a former roommate's 88 Toyota Pickup, but he was too cheap to fix it; I had to blip the throttle before shifting into reverse. Future driving advice: Come to a complete stop and put it in neutral to minimize the chances of wearing out the synchro.
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      02-05-2015, 04:19 PM   #8
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It is not a synchro failure. It is either a reverse idler or shaft sleave failure of the gear set. Only fix is a remanufactured trans from BMW since parts are not available to rebuild it.
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      02-05-2015, 04:20 PM   #9
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Quote:
Originally Posted by NEFARIOUS View Post
Seems like a worn/defective reverse synchro... I had it happen on a former roommate's 88 Toyota Pickup, but he was too cheap to fix it; I had to blip the throttle before shifting into reverse. Future driving advice: Come to a complete stop and put it in neutral to minimize the chances of wearing out the synchro.
That makes no difference at all.
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      02-06-2015, 07:36 PM   #10
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Well, the whole transmission is being replaced. No car until next week.

They can't even tell me what the problem was or what went wrong. They just send the whole thing off to the factory in Germany to be taken apart and diagnosed.

I really hope they're putting a new one in and not a refurbished one... either way, thank jebus for warranty
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      02-07-2015, 03:49 PM   #11
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You get what is available most likely a reman. Nothing wrong with those. Just like the automatics they are all reman units. When a manual locks you out of gear it is usually the main shaft or gear set. No reason to open it up to waste time and money to find out why. Rebuilding the modern manual is not as simple as it use to be. The amount of special tools needed is just stupid now as are the tollarences.
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      02-10-2015, 12:12 PM   #12
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Got the car back. Reportedly brand new transmission was installed. Error was said to be 'an internal mechanism' failure


The car definitely feels different to drive... seems like much stiffer shifting, which I guess is to be anticipated.
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      02-10-2015, 02:03 PM   #13
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That didn't take long.
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      02-10-2015, 07:11 PM   #14
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Quote:
Originally Posted by David1 View Post
That makes no difference at all.
Well, that was what I was taught for truck driving. Maybe it won't too much for cars, but I still do it even with my slushbox E90.
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