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Thread: ABS & TCS Warning lights

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    Default ABS & TCS Warning lights

    Coming home this afternoon I got caught up in a lot of snow down some back roads, which is never good as I am unable to turn the TC off in my car (tried the switch mod but no luck). Anyway I got part way up a hill and the TC was cutting in so much I wasnt getting far and some guys were helping to push. All of a sudden the wheels starting spinning and basically the TC was off. The brake warning light and TC lights are now permanently illuminated on the dash and I have no ABS and no TC. I have checked all the fuses (about 5 in total) but all appear ok.

    Does anyone have any ideas - I think it will be a trip to the garage to get the fault codes read. It was good to experience the car with no TC, but on some of the downhill sections it wasnt the best!!

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    Regular Member Robsey's Avatar
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    This is quite normal in these snowy conditions...did it to mine the other day.

    Easiest way to clear this is to remove the battery for a short while, or overnight if you can.
    This will clear the fault codes.
    Or get a local forum buddy with op-com to clear you DTC's (Diagnostic Trouble Codes) for you.
    Takes about two minutes to do.

    The lights have come on because the TC and ABS were not able to function effectively due to the snow. They then just switch themselves off in a paddy...
    Another cause can be slush / snow or ice getting wrapped around the wheel speed rotation sensors (ABS sensors), thus causing what appears to be an open circuit in the "eyes" of the ECU's

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    Regular Member byebyeitsagsi's Avatar
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    It does go off itself usually by the next morning i believe.

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    Regular Member Robsey's Avatar
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    Depends how lucky you are...mine stayed on until I reset / cleared the DTC's the following afternoon.

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    i had same thing last time it snowed left the car for about 4 hours restarted engine and it took about a minute for the lights to go out

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    The fault won't even reset if the fault is still present - trust me. There are about 50 fault codes for ABS / TC / wheel speed sensors so getting the code read will help a lot.

    What you may want to do though is take the wheel speed sensor wiring connectors at the back of the front wheel arches apart and dry out any water that's in them. Some electrical contact cleaner helps too. The don't seem to seal well and my nearside one had got water in it causing a nearside front wheel voltage error (code read for £10 at a local independant VX specialist). Once dried out, my error light disappeared straight away.

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    Regular Member byebyeitsagsi's Avatar
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    Quote Originally Posted by James24 View Post
    The fault won't even reset if the fault is still present - trust me. There are about 50 fault codes for ABS / TC / wheel speed sensors so getting the code read will help a lot.
    Not according to the many people who posted since late december with the same problem and posted again soon after saying the warning light has went off by itself.

    Going by the amount of people have said the same thing it sounds like the system has a trip system which allows it to switch off by itself when needed. This is maybe why they stopped fitting TC switches on the dash.

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    Regular Member rushy's Avatar
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    Same thing happens on a rolling road, you have to drive through the TC until it turns itself off, then you can do your power run. The TC used the ABS sensors for wheel speed info, this is why they both deactivate.

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    I think a bit of consideration for other points of view would be good here.

    I would have thought that water getting into the sensor or - more likely - the wiring connector has got to be a possible problem and shouldn't be dismissed out of hand. I can't find many posts about people saying their lights went out after a day or so either - must be searching for the wrong words.

    Has it been verified by Vauxhall that the ABS and TC switch themselves off after a lot of slipping? I can't see how them switching themselves off helps as when mine failed the car was definitely a lot worse to drive so I can't see why they would do it.

    I'm sure that there is an issue with TC on rolling roads but then I guess that's quite different from driving on a normal road. Also, rolling roads sound like they don't upset the ABS system otherwise the ABS light would be on as well - both ABS and TC lights come on if there is a problem with a wheel speed sensor as they both use the wheel speed sensors.

    The ABS and TC lights going out could also be water drying/draining out of the wiring connectors or the speed sensors after a few hours / overnight.

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    Quote Originally Posted by byebyeitsagsi View Post
    Not according to the many people who posted since late december with the same problem and posted again soon after saying the warning light has went off by itself.

    Going by the amount of people have said the same thing it sounds like the system has a trip system which allows it to switch off by itself when needed. This is maybe why they stopped fitting TC switches on the dash.
    I have to point out that I did say the fault won't reset if the fault is still present. I did try to clear the fault before I took the connector apart and dried it out but obviously it wouldn't clear because the fault was still present. Some ABS/TC faults (and probably others too) - including wheel speed sensors - will automatically clear themselves straight away once the fault has gone - as I found out once I dried out the connector that had leaked.

    I guess each fault code is set in the computer as to whether it can clear itself once the cause of the fault has gone, depending on whether VX thought it would be safe/wise for it to be able to clear itself or not.

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