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[ChrisHaley07]

Hi all,

I am hoping someone can help as i am a little confused, i have had a problems with my car where by the speedo isn't working, i have checked through here and i can see plenty that involve the ABS or TC as well but nothing for just the speedo, I work at a truck garage and one of the techs used to be a car mechanic and he has had a look and he seems to think that there is a sensor on the gearbox for the speedo but when i have spoken to Vauxhall they say there is no sensor, can someone confirm who is right or if they  have any other ideas on what to try???

Thanks 

[Jimbob]

if you use the trip computer - ie reset average speed, then drive, does that change?

If so could be the speedo unit itself, a firm push to ensure the connector is propely seated may help.

Plus, what are the exact symptoms?

Speedo?
Rev counter?
Mileometer?
Any Lights on?

[MaxV6]

if you can get average speed info on the trip computer,   but the speedo doesn't work, it's the speedo.

AFAIK they cannot be individually replaced , but require a complete instrument cluster....   i've had one fail like this, i seem to recall the replacement being something like £130 or so inc vat.  or cheaper form fleabay... but a new one makes most sense....   

if you can;t get average speed reading on the trip computer, then it's most often  the sensors feeding the abs/traction system, because that's where the speedo derives it's input signal from.

i've never had that fail so i have no idea about complexity or cost...  but the speedo change is easy....

[ChrisHaley07]

Thanks guys for the quick response, the average speed info on the trip computer doesn't work either which is why i thought it may be a sensor somewhere?

The only problem i have is that the speedo and the mileometer aren't working, the rev counter works fine and i have no warning lights on the dash and the trip info isn't working in the trip computer.

[Jimbob]

I think the signal comes from one of the ABS sensors

[RobG]

NSR wheel sensor. Try giving it a clean

[ChrisHaley07]

Thanks, any idea which sensor to check also is it actually part of the ABS sensor or is it just attached to it, sorry to sound like a noob but i haven't had the car that long and not really had chance to look around it.

[ChrisHaley07]

NSR wheel sensor. Try giving it a clean

Cheers Rob, you answered my question before i had asked it, well tomorrow i am going to get the car into the workshop and get the wheel off and check & clean the sensor hopefully that will sort it, just out of curiosity anyone know how much a replacement sensor is?

[henryd]

when you switch on the ignition does the abs light come on an then go off after a few seconds,if the light does not come on at all I would suspect the bulb has been pulled which would point to abs module failure as this affects the speedo as well.also when engine is running if you push the t/c button does that light in the dash illuminate?

[ChrisHaley07]

Yea the ABS light does come on when i turn the ignition key and then it goes off, I haven't touched the t/c button to be honest but when i pull it into the workshop later i will test that.

[ChrisHaley07]

Hi,

Just been out to the car, i have check and the abs light does come on when you switch the ignition on and then the light goes off, i have started the engine and when i push the TC button the light on the dash doesn't come on???

[Teebee]

well tomorrow i am going to get the car into the workshop and get the wheel off and check & clean the sensor hopefully that will sort it

Just for info the sensor is actually bolted into the diff casing so you dont need the wheel off, when I cleaned mine I just reversed it up a pair of ramps.

[ChrisHaley07]

Cheers Teebee, that saves me some hassle i just park it over one of the pits then