Gearbox Fault - jumping into gear slow drive

gibby_wls · Jan 13, 2013

Hi,

My 1997 4.0L V8 P38 AUTO is really testing my patience this weekend.

Out on the road today and pulled up at lights, knocked into N as was going to be there a while.

Moved selector from N to D and "GEARBOX FAULT" pops up on the dash, tried to drive away and it very slowly did so like the handbrake was on and there was a 10t trailer attached. But no nasty noises

Pulled over and turned everything off out in P, restarted and went for D and it jumped into gear and leapt forward like the if your foot slips of the clutch in an manual. Same result if you select R.

I have searched online and cannot seem to find anything amongst the false "GEARBOX FAULT"

Saint.V8 · Jan 13, 2013

Whats your fluid level like in the 'box??

gibby_wls · Jan 13, 2013

I dont know. It was checked and topped up no so long ago (1500miles?)

Saint.V8 · Jan 13, 2013

Hmmmm....could just be a hiccup or low battery voltage....

Run your engine at 2000rpm and measure the voltage at the battery should be 14.2 at minimum.

Does it do it each time you start the car?

gibby_wls · Jan 13, 2013

Only started happening today, not dared try it since, just incase its serious.

battery voltage is OK already i check that regular

Saint.V8 · Jan 13, 2013

Could just be a hiccup, the gearbox defaults to third gear only when it goes into fault to prevent damage, hence why it wouldn't pull away to well.

Try tomoz and see if it returns

gibby_wls · Jan 13, 2013

ah yes now you mention it did feel like a high gear but reverse was OK

it just the fact it jumps/bumps into gear that was worrying me.

dave4x4 · Jan 13, 2013

You will have the HP22 gearbox. The gearbox probably flipped into "limp home mode" due to a fault. It has happened to mine and it locked into 3rd when it did. Wouldn't pull away.
It resets when the ignition is turned off then on.

Think you are on borrowed time. Slipping clutches maybe.

dave4x4 · Jan 13, 2013

Sorry Saint. You nipped in before me while I was typing.
I am saying the same thing I think.

Saint.V8 · Jan 13, 2013

dave4x4 said:
Sorry Saint. You nipped in before me while I was typing.
I am saying the same thing I think.

No probs and yes we are on the same hymn sheet

gibby_wls · Jan 13, 2013

just taken it for a spin, drives fine now, but still GB Fault on dash display when ignition turned off

Saint.V8 · Jan 13, 2013

gibby_wls said:
just taken it for a spin, drives fine now, but still GB Fault on dash display when ignition turned off

If it drives fine - that fault could be a stored fault code in the ECU....

It may be wise to get it on diagnostics to scan for any stored codes....

Datatek · Jan 14, 2013

Double check you have 14.2 volts at the battery with the engine at 2K rpm and that there are no burning smells in the under bonnet fuse box.

NikTheGeek · Jan 14, 2013

gibby_wls said:
I dont know. It was checked and topped up no so long ago (1500miles?)

The way you phrase that suggests you didn't do it. Did you take it to Landrover or a Landy specialist? If not, get it checked yourself. You also said "checked and topped up" rather than "drained and replaced".

A "normal" garage might not know the correct procedure and if you simply fill it until it comes out of the level hole, you will be a good 1.5-2.0 litres low...

Nik

Gearbox Fault - jumping into gear slow drive

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