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Author Topic: auto gearbox fault says the computer  (Read 1502 times)

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burtsomega

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auto gearbox fault says the computer
« on: 18 February 2011, 10:11:40 »
Hi all im new to this site & new to vauxhalls!
few weeks back i lost my dad & i thought it was a good idea to take on one of his cars which is a omega 2.0 CD auto on a S reg. its got a 2.0 eco tech engine in it with a "sealed gearbox".
ive done a little over 400 miles in the car & it is now coming up with a "gearbox fault" on the computer in the dash, when this first happend all the clocks/dials in the dash seem to lose power & the ABS light came on then went off & the airbag light came on & then went off....i pulled over to side of the road & poped it in to neutral & gave it a rev & it seemed to clear the clocks/dial problem (thought it might of just been a bit damp as it heavy liquid sunshine that day) but the gearbox fault was still on the screen.
it doesent seem to come up with the fault untill youve done a few miles . the lasttime i used it it came up with the fault it went into limp mode & seemed like it was pulling away in 3rd gear so i put it in to 1st gear then it started to pull away & went up through the box ok if driven manually but when i got it home on the drive the seemed to be making a slight funny noise but only does it when the fault message is on the screen...any help will be grateful thanx for your time Reg.
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TheBoy

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Re: auto gearbox fault says the computer
« Reply #1 on: 18 February 2011, 10:19:35 »
Sounds like gearbox going into limp mode. This can be result of a detected engine fault, so do a 'Paperclip Test' (see Maintenence Guides) to check engine hasn't detected anything.

Additionally, given the other glitch, get a voltmeter on battery and test battery and alternator as per Kevin Wood's guide in Maintenence Guides.

Post the results to this thread :y
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Hannah Judes Dad

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Re: auto gearbox fault says the computer
« Reply #2 on: 18 February 2011, 20:03:15 »
Does the gearbox thud at all during changes? If so that will be your thrust washer that will need replacing.I had'gearbox fault' on my display and similar symptoms to what you are describing i.e. loss of power,having to manualy change gear etc. It was my gearbox oil that needed replacing in the end.
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Hannah Judes Dad

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Re: auto gearbox fault says the computer
« Reply #3 on: 18 February 2011, 20:05:41 »
Forgot to say you will need to use gearbox oil equivalent to Dexron 3 rating in the Omega,just under nine litres iirc for a full box.
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albitz

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Re: auto gearbox fault says the computer
« Reply #4 on: 18 February 2011, 20:16:40 »
If it isnt connected to an engine fault, check the fluid level and then clean the selector switch, as per the guides. :y
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burtsomega

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Re: auto gearbox fault says the computer
« Reply #5 on: 18 February 2011, 22:02:49 »
thanx for the post's, going to have a look @ it 2morrow & ill let you know my finds.  ;)
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Entwood

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Re: auto gearbox fault says the computer
« Reply #6 on: 18 February 2011, 22:05:15 »
Stick your location in your profile .. you might be near someone with a suitable code reader ???
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burtsomega

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Re: auto gearbox fault says the computer
« Reply #7 on: 19 February 2011, 17:19:49 »
ok been outside having a fiddle with the car it seems to be a electrical fault, the battery was sat @ 11.32volts  observably not enough to start the car so i put a power pack across & started & then put the meeter back across & you can watch the voltage drop from the battery! my dad had a new altinator on the car & the charging build  had blown so the RAC guy by-passed the light in the dash? the ABS light was staying on then the airbag light started coming on & the computer said "automatic gearbox"?. im guessing there is a electrical fault in there somewhere but where the hell do i start?! :-[
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Andy B

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Re: auto gearbox fault says the computer
« Reply #8 on: 19 February 2011, 17:43:59 »
Quote
......  im guessing there is a electrical fault in there somewhere but where the hell do i start?! :-[

A new/recon alternator by the sounds of things  ;) ;) ;)
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burtsomega

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Re: auto gearbox fault says the computer
« Reply #9 on: 19 February 2011, 18:30:25 »
its got a new alternator on it...imwondering if its to do with the charging light that the RAC guy by passed? with the booster pack on it it runs like its ment to....& as soon as you switch of the engine the battery regains its charge.
« Last Edit: 19 February 2011, 18:31:35 by burtsomega »
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tidla

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Re: auto gearbox fault says the computer
« Reply #10 on: 19 February 2011, 18:37:43 »
never ignore the battery. can have you going round in circles if its faulty so get that tested first to illiminate it.
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burtsomega

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Re: auto gearbox fault says the computer
« Reply #11 on: 19 February 2011, 18:43:54 »
battery is only 8 weeks old lol, tho i think its a micky mouse one  >:(
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Andy H

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Re: auto gearbox fault says the computer
« Reply #12 on: 19 February 2011, 18:48:16 »
Quote
its got a new alternator on it...imwondering if its to do with the charging light that the RAC guy by passed? with the booster pack on it it runs like its ment to....& as soon as you switch of the engine the battery regains its charge.
I cannot imagine what kind of bodge has occurred there  :-/

Older alternators (Lucas ACRs for example) needed the charge warning lamp to be in circuit with the field coils to work. In normal use the field current wasn't sufficient to light the lamp. If charging was marginal the regulator increased the field current to the point that the lamp glowed.

The Omega alternator has a more robust output for the warning light (the Carlton used to use it to operate a relay that inhibited the rear screen heater until the warning light went out). I suspect that 'bypassing the warning light' could blow the regulator in the alternator  :(
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TheBoy

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Re: auto gearbox fault says the computer
« Reply #13 on: 19 February 2011, 18:53:55 »
What are your voltage readings at idle, 1500rpm and 3000rpm?

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burtsomega

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Re: auto gearbox fault says the computer
« Reply #14 on: 19 February 2011, 19:10:05 »
the voltage keeps dropping unless you are giving the engine revs, when the engine is @ revs it sits @ what ever it droped to, IE last time i held it on a rev the voltage sat @ 7.34  :-[
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