speedometer

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stud duffin - 21 Oct 2006 04:43 GMT

I have a 96 pontiac grand am gt and when its goin about 30mph or so the
speedometer starts jumping around and then just falls to zero and stays
there till i slow down again. what could be the problem here?
Could this cause the check engine light to be on also?

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=?x-user-defined?Q?=AB?= Paul =?x-user-defined?Q?=BB?= - 22 Oct 2006 15:40 GMT

> I have a 96 pontiac grand am gt and when its goin about 30mph or so the
> speedometer starts jumping around and then just falls to zero and stays
> there till i slow down again. what could be the problem here?
> Could this cause the check engine light to be on also?

Possible bad sending unit.
Yes.

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James Drinkwater - 22 Oct 2006 23:23 GMT

Pull the trouble code from the computer first. Definitely first step.
Can't offer a guess since I avoid GrandAm's like the plague (No offense, I
just see a million electrical problems from them:)
Who knows? Maybe the speedo's run by the computer with input from the
Vehicle Speed Sensor. You might find an error code indicating either one at
fault. Sure hope you don't have to chase wiring.
Drink
"« Paul »" <"=?x-user-defined?Q?=AB?= Paul
=?x-user-defined?Q?=BB?="@houston.rr.com> wrote in message
news:453B836A.820E092C@houston.rr.com...

>> I have a 96 pontiac grand am gt and when its goin about 30mph or so the
>> speedometer starts jumping around and then just falls to zero and stays
[quoted text clipped - 3 lines]
> Possible bad sending unit.
> Yes.

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Geoff Welsh - 23 Oct 2006 05:20 GMT

> Pull the trouble code from the computer first. Definitely first step.
> Can't offer a guess since I avoid GrandAm's like the plague (No offense, I
> just see a million electrical problems from them:)
> Who knows? Maybe the speedo's run by the computer with input from the
> Vehicle Speed Sensor.

It is. A bad speed sensor typically just doesn't work. A bad
speedometer acts like the OP described.
GW

> You might find an error code indicating either one at
> fault. Sure hope you don't have to chase wiring.
[quoted text clipped - 8 lines]
>> Possible bad sending unit.
>> Yes.

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512331Jack3490 - 24 Oct 2006 23:21 GMT

1996?
it must be so rusted now

>I have a 96 pontiac grand am gt and when its goin about 30mph or so the
> speedometer starts jumping around and then just falls to zero and stays
> there till i slow down again. what could be the problem here?
> Could this cause the check engine light to be on also?

Reply to this Message