Speedometer inaccurate?

Discussion in 'Audio & Electronics' started by therammy, Dec 24, 2016.

  1. therammy

    therammy Junior Member

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    7
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    Joined:
    Dec 24, 2016
    Ram Year:
    1995
    Engine:
    5.2L Magnum
    The speedometer on my Ram is only accurate for any speed under 30MPH. After that, it lags behind and at around 70MPH it shows I'm going around 45MPH.
     
  2. dudeman2009

    dudeman2009 Senior Member

    Age:
    22
    Posts:
    1,395
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    Joined:
    Feb 9, 2016
    Location:
    Lansing, Michigan
    Ram Year:
    2001 1500 Sport with enough electrical modifications to make my brain hurt
    Engine:
    Magnum 360
    Run a cluster self test.

    Ignition off, hold down the trip reset button.
    While holding button turn ignition to run.
    Wait until odometer shows 'check'.
    Release trip reset switch and watch cluster for about 1 minute. All LCD digits will test followed by all gauges performing a full sweep in three increments.
     

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