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Answer= on the top of the differential there is a speed switch which . you can check the switch by unplugging it and put an ohm meter across the prongs on the switch if it reads infinity ( open) it is bad ( a good switch will read about 1.8 K ohms of resistance) and will cause the abs and brake lights on the dash to stay on it will also will cause the speedometer not to read below about 20 MPH. the switch is a dealer item - cost about 40 dollars. the switch is easy to change and take about 10 minutes.

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You might want to take a look at the speed switch - its a pickup switch used to monitor your speed

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Had the same problem on my 1999 Dodge Ram 1500 4x4. ABS and BRAKE light on, no speedometer/odometer at lower speeds and the CHECK ENG light on. Used scanner at Auto Zone to download fault codes; fault code linked to malfunctioning speed sensor. Went to dealer and picked up new differential speed sensor ($45), installed it and presto, everything good to go. I chose not to disconnect the battery during sensor replacement so the CHECK ENG light remained on for a few trips before the PCM (computer) cleared the speed sensor fault from memory. The CHECK ENG light then extinguished.

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โˆ™ 2009-11-21 03:44:29
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Q: What would make your speedometer stop and abs light and brake light come on in 1998 dodge ram truck?
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