Question about 1993 Dodge Ram

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My speedo on my 1993 dodge cummins quit working, i use to be albe to get up to around 80km/hr and it would work again. also my overdrive doesn't work when i speedo isn't working. any ideas.

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I am no expert on this but have the same problem. Here is where I am at. I bought the truck used, needed a new PCM which after installing one from a gas job and verifying that wiring was good, bought a reman from Chrysler. Speedo still did not work even though it did with the gas PCM but was fluctuating allover. Chrysler replaced PCM and speedo started to work intermittantly. Took truck into dealer and $600. later told mechanic thought it was faulty PCM. He called Chrysler and asked them to pull one from the shelf and test. They said needed a new crankshaft speed sensor.Mechanic took truck on the road, shifted into nuetral then turned ignition back on, speedo works. Replaced crankshaft speed sensor and situation didn't change. Total spent $1000. and no speedo and no overdrive. Speedo started working intermittantly, seemed like depending on transmission temperature. Friend that works on dodge said is instrument cluster. tried another cluster still the same. Replaced ignition switch, thinking that may be the problem. Still the same. Bought a new Neutral starting switch, which I have not replaced as of yet. If I place truck in neutral and start the truck speedometer is activated right away but does not stay. So right now am down to two scenarios. The neutral starting switch or,...... the temp sensor in the oil line. Feeling is it is the neutral starting switch. By the way had already replaced speed sensor in tranny and rear end. Going to replace neutral starting switch, cost is $25. for the part and see what happens. Please keep us posted, as others are having the same problem.

Posted on Jan 23, 2010

  • pjsalib Feb 21, 2010

    Replaced the nuetral starting switch to no avail.

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It's a fusible link, I did most of the same stuff and in the end it was just a burned up fusible link

Posted on Jan 09, 2017

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This is what I have found on my 93 Dodge w250, 4x4, diesel, auto

I have been through all of this MULTIPLE times. When all your gauges go crazy and the ALT gauge shows it is not charging...it is the main brain. I have to replace the brain in my truck usually once every year or two. I pull it out, ship it to someone in Texas, he rebuilds it, and it works great all over again. One thing I found is DO NOT use your trucks battery to jump start ANYTHING. This will cause failure in the brain.

As to the problem of speedo and overdrive coming in and out. This is caused by a faulty speed sensor located on the transfer case. DO NOT buy crappy aftermarket ones. Once again, every year or two I have to buy a new speed sensor direct from Dodge.

Good luck

Posted on May 13, 2013

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I have a similar situation with my '93 Dodge diesel except except my speedo, odom and battery charge gauge work in tandem intermittenly. The result being that the truck seems to work solely off the battery of course losing its charge. Still searching high and low for a loose ground.

Posted on Mar 11, 2011

  • tubanturtle1
    tubanturtle1 Feb 28, 2012

    My 93 Dodge's speedo will just stay on zero mph until i am going about 80 and then the speedo will move to about 20 mph. All the other gauges work perfect. Any thoughts on what i could do?

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I am having similar problems on my 91 ram 350 5.9L Cummins. Slipping out of overdrive, speedometer works most of the time but will wiggel wildly occasionally. Rebuilt tranny, no luck. Replaced throttle position sensor, no luck. A friend told me it could be the Coolant Temperature Switch, connected to the tranny. I bought on from Dodge and am about to put it in. Will let you know how it goes.

Posted on Apr 15, 2010

  • Anonymous May 02, 2016

    I've heard ground connections to fenders are critical (regarding PCM located between battery and fender). Bare metal, non-silicone grease to keep that bare metal shiny.

    TPS only sets the speed at which OD (overdrive) kicks in.

    CTS (coolant temp sw) through PCM prohibits OD from engaging below approx 60 degrees.

    No Charging can be caused by Crankshaft sensor located above damper pulley. Leads famous for breaking internally. Should have .050 clearance measured with brass feeler gauge. If the PCM doesn't receive the signal from the crank sensor, the PCM thinks the engine isn't running, therefore it disables charging.

    Pull the connectors to the PCM and clean the contacts....common problem, maybe an easy fix.

    IF the PCM thinks the truck isn't moving, it will NOT send signal to OverDrive solinoid. I'm pretty sure this is related to the speed sensor at the driveshaft. Also maybe bad (dirty or oxidized) contact at PCM connector or broken wiring to that connector. Inserting connector several times might make a difference?

    Now to apply most of these to my truckthis week.

    Super cool and cheap tps fix at dieseltruckresource.com/forums if contact cleaner sprayed up through drain hole followed by thin oil doesn't fix it. should read all 8 pages.

    Good luck to us all! Charlie

  • Justin Olson
    Justin Olson Jan 09, 2017

    I pulled a lot of hair out on this issue and I was able to correct the problem by putting inline fuses in place of all fusible links, I did all at once so I can't say for sure which one fixed it but, they are on the driver side inner fender

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