Member Since: 23 Oct 2016
Location: Penrith
Posts: 143
Gearbox problem - 3-4 shift
Hello all.
Disco 3, 140k, auto, MY06 2.7tdv6
After swapping my injectors, I decided it would be a good idea to reset the adaptive settings on the autobox as I felt the torque improvements from the engine may result in different shifting patterns. I now regret doing this as the gearbox was working fine before I reset it.
Background on the gearbox - it had a oil change and new sump/ filter around 5k mile ago. It had 2 tubes of Dr Tranny at this point due to slight judder under load.
Problem now is that I have an intermittent fault when make the upshift from 3-4. This will happen both in M/S mode and full auto. It will make the shift sometimes, but only when the rev and load are light. The other shifts are a bit slow at present, but ok. They're improving after the reset.
When it makes a bad shift from 3-4, I get the big 'F' on the dash and can only use gears 1-3. Restarting the car resets this and all gears can be used.
I've read the error codes with my IID BT. The only relevant problems is a 'Pending code' - "algorithm error 3-4 shift".
I imagine that my gearbox is on it's last legs, and resetting it was a bad idea. I'm hoping that the adaptive settings can re-learn the worn clutches and restore normal function.
Any suggestions or advice?
21st Feb 2017 10:20 am
gilesharrison
Member Since: 23 Oct 2016
Location: Penrith
Posts: 143
Just some more info on this. I am getting the following codes from the transmission
P0783-62 (AC) 3-4 shift - Algorithm based failure - signal compare failure
( at 141831 mi )
U0155-87 (6D) Lost communication with instrument cluster control module - Bus signal/message failure - missing a message
( at 141832 mi )
P0783-64 (AF) 3-4 shift - Algorithm based failure - signal plausibility failure
( at 141850 mi )
I'm sort of thinking this is an electrical issue, rather than a gearbox issue. As you may see in my other post, I have just been replacing injectors which involved disconnecting and moving the wiring harness from the TCM Unit behind the battery.
I'm going to remove the battery and recheck the connections. Anything else you might suggest?
21st Feb 2017 7:20 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
No, not an electrical issue it is a real mechanical failure inside your gearbox. Specifically you have a failure on clutch E and probably due to the bronze stator bush failing.
Sorry!Land Rover - Turning Drivers into Mechanics Since 1948
Like you, my problems started after replacing the gearbox fluid.
Good luckCurrently 2009 Disco 3 SE, 2013 MY D4 HSE and 2016 D4 SE
Previously:
TD5 Defender 110 CSW (230k miles)
300TDi Disco 1 (289k)
4 RR Classics (300-350k each, 2 manual, 2 auto)
110 V8 CSW (220k)
S3 109 hi cap pickup (ex RN)
S2A 88 Safari SW with lpg conversion (bloody lethal)
21st Feb 2017 8:13 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20731
Clutch E issues can be caused by a wonky TC
My box had exactly the same issue. I opted for a factory recon box, as I need it to be reliableMy D3 Build Thread
Member Since: 23 Oct 2016
Location: Penrith
Posts: 143
Many thanks for the replies to this. Obviously, not really what I want to hear!
Would this fault give intermittent problems? I've just driven about 20 miles without an issue. Also, shifting between gear 4, 5 and 6 is completely normal, both up and down the box.
21st Feb 2017 8:45 pm
waterbuoy
Member Since: 26 Oct 2013
Location: Argyll
Posts: 2862
In my case the problem became more apparent after the gearbox had fully warmed upCurrently 2009 Disco 3 SE, 2013 MY D4 HSE and 2016 D4 SE
Previously:
TD5 Defender 110 CSW (230k miles)
300TDi Disco 1 (289k)
4 RR Classics (300-350k each, 2 manual, 2 auto)
110 V8 CSW (220k)
S3 109 hi cap pickup (ex RN)
S2A 88 Safari SW with lpg conversion (bloody lethal)
21st Feb 2017 8:51 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
gilesharrison wrote:
Would this fault give intermittent problems?
Yes but the fault will only get worse over time.Land Rover - Turning Drivers into Mechanics Since 1948
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