Speedometer stopped working suddenly. - TCCoA Forums
 
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post #1 of 13 (permalink) Old 05-19-2011, 08:34 PM Thread Starter
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Speedometer stopped working suddenly.

I really have no idea what happened here. I left school it was working, went to my buddies and as far as I can recall was working up to that point. I never got out of my car, started it up and drove away. Few secs. laer I notice the speedo isn't moving.


I didn't notice until later that the odometer and tripometer also aren't working, so this poses a bit of a problem.

the tach and everything else is working fine.

What are the odds the gauge module itself went bad and not the speedo gear?

Rest In Peace Mom.
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post #2 of 13 (permalink) Old 05-19-2011, 08:42 PM
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The speedometer and odometer are independent of one another, save for both sharing the speedo signal from the EEC.

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post #3 of 13 (permalink) Old 05-19-2011, 09:08 PM Thread Starter
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Maybe my odometer is working then, I will have to pay more attention.

Otherwise what your saying basically is the speedo gear must be broken?? if they aren't receiving a signal then both won't work... if the speedo module was dead the odo would still work?

am I understanding that properly?

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post #4 of 13 (permalink) Old 05-19-2011, 09:13 PM
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If the odometer isn't working it's because there is either a lack of a speedo signal, the motor is dead or there's a broken gear. If the speedo isn't working it's due to either a lack of signal or the motor is bad.

In my three cars, the odometer motor in the Mark 8 was bad and a SHO speedo died on me (motor).

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post #5 of 13 (permalink) Old 05-19-2011, 09:31 PM Thread Starter
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So I need to replace the gear. Great.

I tried searching for speedo gear. I didn't find anything much but I know there are threads on replacement. Wrong search terms?

How hard is it to replace the gear and how costly?

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post #6 of 13 (permalink) Old 05-19-2011, 09:52 PM
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I have seen references to the VSS going bad, I haven't seen anything about the gear itself going bad (unless you use the 23 tooth gear for 4.10 swaps).

The VSS is bolted to the transmission with one bolt. Unhook the harness, unbolt the bolt and it slides right out.

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post #7 of 13 (permalink) Old 05-19-2011, 09:59 PM Thread Starter
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Oh so the gear itself should be fine. This is a sensor issue. Well if I'm lucky it just came unplugged or something

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post #8 of 13 (permalink) Old 05-20-2011, 06:07 AM
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I would bet on the VSS going bad, not the gear. When mine went out it was intermittent and eventually threw a code.

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post #9 of 13 (permalink) Old 05-21-2011, 07:50 AM Thread Starter
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Is there any chance this is a fuse issue??? My interior lights also don't work. I opened my door lastnight and no lights came on, I can't turn them on with the switch either.

And I don't know how to explain it but the buzzer/beeper that goes off when you leave your keys in or lights on, is acting odd, but not really.

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post #10 of 13 (permalink) Old 05-23-2011, 08:03 PM Thread Starter
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it was a fuse....interior lights tied into the speedo apparently

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post #11 of 13 (permalink) Old 05-24-2011, 01:50 PM
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it was a fuse....interior lights tied into the speedo apparently
Any idea what caused it to blow? Or was it a CND?
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post #12 of 13 (permalink) Old 05-24-2011, 01:54 PM
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Happened to me once. interior light stopped working, and speedo stopped working on the way home from a trip to KC. LOL cost me a speeding ticket. Never would have guessed the speedo and the interior light would be on the same circuit, till they both went out at once.


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post #13 of 13 (permalink) Old 05-24-2011, 03:13 PM Thread Starter
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I really don't know what caused the fuse to blow. I drove my buddy home, shut off the car and we chatted for a while. Everything was working.

He left, I started the car drove away. That's when I noticed it wasn't working. No apparent reason and the fuse hasn't blown again yet.

I didn't even think of a fuse until the next night when I noticed my interior lights didn't work.

It's very strange to have the interior lights tied to the singular most important gauge module.

Rest In Peace Mom.
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