Question about 1999 Dodge Ram

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What could be causing lock up to kick on & off while driving down the highway?

Shifts gears fine, but sometimes lockup kicks on & off when trying to maintain highway speed. there seems to be no pattern, except that it happens more frequently in warmer weather

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  • Shawn Hardy
    Shawn Hardy May 10, 2014

    2002 Dodge Ram 1500 (site keeps renaming it to 1999)

  • Rick Yewell May 10, 2014

    What is "lock up"? is this your 4 wheel drive, cruise control or your overdrive kicking on and off



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You need to get a transmission repair or overhaul done.

Posted on May 12, 2014

  • Harold Smith
    Harold Smith May 12, 2014

    Check your DTC's with a scan tool first. It could be something simple as a vacuum leak or a bad module. I would spend $3 or 4 thousand dollars on a transmission if I didn't have to.


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If your talking about the transmission OD; maybe it could be the vacuum system. I would have no way of knowing unless I could verify the problem in person. My advice to you would be this; take the truck to a good independent shop or Dodge Dealership and pay $50-80 and have them hook a scan tool up to it. I wouldn't use your local parts store for it, because their OBD II scanners can't give you the deep diagnostic scan you need. Then you will know the problem area (s) and can fix it yourself. You don't want to spend unnecessary money trying to fix something that is not the root cause of the problem.

Posted on May 11, 2014

  • Harold Smith
    Harold Smith May 11, 2014

    jimfuller 7's post is also correct, it could be the lock up converter, but I don't want tell you to fix something that is not the root cause.


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Sounds like your lock up converter is kicking on and off. a shift kit could help. just take it to your transmission shop and be done with it.

Posted on May 10, 2014

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Posted on Jan 02, 2017

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SOURCE: engine shut down while driving

This will need a good repair shop , not necessarily a dealer. Find one recommended by friends that can do computer/electrical work. The "no bus" means the cars computer network is losing comminication between itself. This is not a code , but you might have code(s) stored in the computer system.A repair shop can scan for any stored codes to start the diagnosis.The problem could be in the PCM (engine computer) or even the Theft deterent system. Sounds more like theft deterent because of the no crank situation. If you have the spare ignition key try it & see if anything changes.

Posted on Feb 18, 2009

  • 3 Answers

SOURCE: 96 dodge neon, Loss of power, check engine light

check your fuel pressure, should be 40lbs+ at idle. If you dont know how to do this, have a friend or a shop check it for you. I had same problem, no power at all would barely run ect,, turned out to be fuel pump.

Posted on Dec 23, 2008

  • 1 Answer

SOURCE: transmission shifts hard down from highway gear only (D>3rd)

I had the same thing! It was a computer issue. It only cost me about $35.00.

Posted on Dec 29, 2008

  • 4825 Answers

SOURCE: rpms fluctuate 300 to 400 rpms when driving

hav u done your needed maintenance like checking oil level-itz done with engine going in park also shift cable needs ajusting or solenoids on the electronic models if alot of miles then a rebilt is posible am tired and its late-try testing the tps sensor 1st has to with shifting***

Posted on Aug 07, 2009

  • 1129 Answers

SOURCE: my 1999 dodge ram runs good except when the

It sounds like a MAF sensor is dirty or faulty, clean first with gumout then replace if problem persists.

Posted on Nov 04, 2009

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