'Gearbox Fault' - Limp mode?

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domino

domino

Well-Known Member
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Location
Edinburgh
Just been up to le shoppe and picking up the other half. Sitting at the lights and I had it in neutral (they take an age to change at this time of day). Lights change and I put the gas down forgetting i'm not in gear. It comes up saying 'gearbox fault' - I put it in to drive and head off but it's revving a lot higher with not a lot of speed.

I don't, as yet, have Nanocom (no money at present to get it..!) so I can't check myself what's going on. Pulling up to my street and waiting for traffic to clear so I could cut in was scary - putting your foot down yields little to no power so, after changing my underkeks here I am.

Any suggestions? I presume I will *need* nanocom or similar to read/clear the fault before limp-home goes away?
 
domino said:
Just been up to le shoppe and picking up the other half. Sitting at the lights and I had it in neutral (they take an age to change at this time of day). Lights change and I put the gas down forgetting i'm not in gear. It comes up saying 'gearbox fault' - I put it in to drive and head off but it's revving a lot higher with not a lot of speed.

I don't, as yet, have Nanocom (no money at present to get it..!) so I can't check myself what's going on. Pulling up to my street and waiting for traffic to clear so I could cut in was scary - putting your foot down yields little to no power so, after changing my underkeks here I am.

Any suggestions? I presume I will *need* nanocom or similar to read/clear the fault before limp-home goes away?
Click to expand...
Gearbox fault is often due to low battery voltage.
Have you checked the oil level?
 
Gearbox oil level?

So far I've done nothing. Parked up and switched off and back on to make sure it wasn't a fluke message.
 
Not sure what model you've got, but on gems engine the gearbox oil dipstick is at back of engine on passenger side (behind engine dipstick).
 
I've got a 2000 4.0 HSE - does that help?

Sorry, I should have mentioned that in the original post.
 
So, 12.6 when just sitting, 13.4 when car is idling and 14.02 when at 2000rpm. The battery is a bit of a small puny thing though.

On a side note, sounds like the bearing on the alternator pulley is dry - makes quite a noise and if you touch the alternator you can feel a grind.
 
domino said:
So, 12.6 when just sitting, 13.4 when car is idling and 14.02 when at 2000rpm. The battery is a bit of a small puny thing though.

On a side note, sounds like the bearing on the alternator pulley is dry - makes quite a noise and if you touch the alternator you can feel a grind.
Click to expand...

13.4 at idle is low, 14.02 is a tad low at 2k...magic number is around 14.2 at 2K and above 14 when at idle usually...

That could be a sign, first systems to hiccup on the P38 are the ABS/TC and Gearbox when volts start to drop.

Alternator sounds shagged...they can be rebuilt, but a service exchange unit isn't expensive!
 
domino said:
So, 12.6 when just sitting, 13.4 when car is idling and 14.02 when at 2000rpm. The battery is a bit of a small puny thing though.

On a side note, sounds like the bearing on the alternator pulley is dry - makes quite a noise and if you touch the alternator you can feel a grind.
Click to expand...

Lucky you, no wonder your eyes have gone. Overhaul the alternator and fit a proper battery before the cold weather comes.
 
domino said:
Here it is!

https://www.dropbox.com/s/e4na250yil93c7e/IMAG2470.jpg

Think I need to change that for a start. Thing is, I do need the gearbox to behave!
Click to expand...

Yep a bit undersized...!!!

With luck once you get a good voltage output and have checked gearbox oil level....checked cold, engine running, go through gears and back to N or P, vehicle level, open the level/filler plug and the oil should just dribble out...

Best to get under the car first, engine off, locate level/filler plug, loosen it as they can be sodding tight, start engine, go through the gear selections and the take the plug out and check level...

Filling them up is fun, I use a fence sprayer modified to pump the oil in until it dribbles out, then plug in and take for a drive...what till morning and check level again!
 
Do the faults clear themselves and come out of limp home or will it require a reset from software?
 
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