Another gearbox problem

I noticed my box was a little slow going into reverse with a little clunk and going down from second to first it felt a little weird so I booked it in Saturday for a gearbox oil and filter but guess what drove off tonight and 2 miles down the road it went into limp mode with transafe fail message I code read it and got gear monitoring 5 I cleared the codes and it drives as before but transafe still shows on the dash I also noticed it will start while in drive please any help

Doesn't sound good

The oil and filter change on Saturday will show you the condition of the gearbox
Good luck !

Change the cooler/filter on the rad as well 100% & you might be lucky could be clogged/blocked DON'T DRIVE IT unless you have to

its a long shot but check the wiring plug to the gearbox solenoid switch control unit it could be wet/loose or even faulty, this will cause havoc I had to replace mine

That sounds like the A Clutch is slipping...

There is a bearing between two clutch drums (B and C I think) and this has a tendancy to break up, this then causes the Clutch pack to move axially along the shaft and this movement tears the O ring underneath the A Clutch causing hydraulic pressure to leak away and as such the A Clutch starts to slip, the Gearbox monitors the various shaft speeds etc in the box and if there is a mismatch over a certain amount it goes into failsafe mode to prevent burning the clutch pack out.

Drain the oil, drop the pan and check the condition of the fluid and magnets....thats the first step!

Pictures courtesey of RRPhil/Bemble...







Good news is, aslong as the A Clutch isn't burnt out, the repair is simple (new bearing and O ring) but if the box is off, you may as well change the TQ, and all the O rings and such in the box as it is only something you wanna do once!

Also as mentioned above, do check all the wiring tothe box as this can cause problems (as Wil Says)....

I'm going to check oil level today and the wiring and get the oil and filter done tommorow fingers crossed

Well I added a litre of oil today it made no difference so it's getting an oil and filter tommorow if it's still the same a gearbox rebuild with upgraded valve block and convertor £1560 oh dear

alarmfitter said:

I also noticed it will start while in drive please any help

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Which model do you have (TD6, BMW V8, Jag V8)?

I would start by checking the inhibitor switch if it allows you to start the engine in 'D'

Td6 there was no debri in the box but it was the wrong filter so we fitted the right filter and new oil I drove it 30 ish miles no problems I then had the gearbox reset drove off and now it going into limp mode but the code has changed from " code 55 gear 5 to code 37 gear 5 I'm stumped

alarmfitter said:

Td6 there was no debri in the box but it was the wrong filter so we fitted the right filter and new oil I drove it 30 ish miles no problems I then had the gearbox reset drove off and now it going into limp mode but the code has changed from " code 55 gear 5 to code 37 gear 5 I'm stumped

Click to expand...

Ahhhh - ignore my post above if yours is the TD6 GM box....