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My speedo,tach,odometer stopped working.truck has no acceration when this happens.Also will not shift 2 overdrive.Comes and goes but rarely comes back.when good as soon as i shut it off it happens again.Any ideas?

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  • Cars & Trucks Master
  • 40,710 Answers

Run fault codes and look for problems in the TCM (transmission control module)

Posted on Oct 13, 2013

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6ya6ya
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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: I have a 1995 Chevy

i have a 95 k2500 350 just put in a new tranny and less than 90days later there is little to no pressure. Thinking it is a bad pump but could be the ecu thing as well since the previous tranny went out the same way. If you know where to locate it any help would be great! c = 2wd k = 4wd

Posted on Sep 29, 2008

  • 1 Answer

SOURCE: Speedo stopped working last night. Stuck in first!

Your Trans should be the 4L60. If your speedometer quits working and the truck won't shift out of 1st gear, the "Speed Sensor" is probably bad or the wiring is bad where it plugs into the sensor. The sensor will be towards the back of the trans or on the tail shaft. An easy way to test if the wiring is bad at the plug is to pull on the wire 3" or 4" from the plug and watch closely to see if it stretches. If there is any stretch the wire inside the plastic sheath is broken.

Posted on Jan 16, 2009

  • 1 Answer

SOURCE: tach stops working and trac control light off comes on

It sounds as though your Crankshaft Position Sensor has gone out. They are pretty easy to change. You will have to remove your harmonic balancer/crank pully to get to it, as it is on the inside of the pully. Also, if you have a 3.1 engine, you have a second Crankshaft Position Sensor on the side of the engine closest to your firewall. (it is below the number 1 and 3 spark plug). It could be that one or the one behind the balancer. I would suggest replacing both of them at the same time. As for removeing the harmonic balancer, you should use a puller to do so. When reinstalling it, do not use a hammer or anything to tap it back on, as this can damage the balance and also the crankshaft. You should use a harmonic balancer installer to put it back on. Both the puller and installer can be borrowed from Autozone (with a deposit that will be returned once you return the tools).

Posted on Jul 22, 2009

  • 3 Answers

SOURCE: under acceleration abs light comes on speedo and

My truck does the same. Has anybody solved this yet? I just ordered OBD2 connector to connect my laptop to truck to monitor. Hope I can find the problem

Posted on Dec 22, 2009

  • 1 Answer

SOURCE: 1994 Buick Regal 3.8L automatic overdrive.

Check the electrical connector above the modulator. If the connections are loose or the connector is damaged... similar things happened to mine.

Posted on Jan 06, 2010

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Instruments don't work, key stuck in ignition, doesn't shift correctly


Sounds like you need a new car.
With joking aside, the problem with your speedo, tach, gas guage, temp gauge and odometer can probably be one of two things. Check your fuses. If they are fine you may need to replace your cluster panel. I had to have the entire thing changed over my speedo not working right. It was not cheap. You might want to check the relay box under the hood. Does your transmission leak? Check the fuses and relay on it also. Get a new ignition switch and replace the old one if your key is stuck. You can try WD40 on that key but don't expect any miracles. The bearings are likely shot. Sorry I posted all of this bad news. Good luck.

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unplug the trailer first to see if it is something in it''s wiring.
not going into OD could just be that the load is too much to handle in OD.
speedo and tach I would start by checking fuses.
sounds like the problems are all related.

http://www.fullsizechevy.com/forum/general-discussion/technical-maintenance/472951-97-k1500-no-speedo-wont-shift-abs-ses-lights.html

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Dec 10, 2009 | 1998 Chevrolet K1500

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Tach and speedometer work intermittenly and sometimes trans doesnt shift until 4500 rpm. vw cabrio 1999 automatic.


Good question! My Cabrio's odometer works only when the outside temps are really cold... that means about freezing temp. My VW repair shop guru guy says that the Cabriolet is notorious for this failing. Since the odometer is driven through a small gearbox via the speedo cable, I suspect the odometer "transmission" is mostly kaput. The tach is also mechanically driven so it also may have a semi-functional cable. The only way to really know is to pull the cable and check it for damage. As far as the trans goes have you tested it for codes?

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