Speedo problem

Asked by Jan 12, 2017 at 10:35 PM about the 1999 Dodge Ram 1500 4 Dr Laramie SLT 4WD Extended Cab SB

Question type: Maintenance & Repair

I have. 1999 Dodge Ram 1500 slt larime
4x4 my speedo is off by a lot at low
speeds like from 0-25 is dead on but once
I get above that it's off by 12mph the truck
has 265/75/16 and stock is 245  ... now
what have I don't to try and figure it out. I
have replaced the out put shaft speed
sensor I have replaced all my abs sensors
pretty much new wheel bearings . In the
front because my abs and brake lights
where on and.. they where shot . Also
replace the rear end speed sensor.. in
running out of ideas on what it could be I
have no lights on in my dash also my cruse
control will only let me set it from 30-67
mph it won't hold anything over that .. can
someone please tell me what I can try and
fix next and replace please and thank you!!

1 Answer


You need to have the system live data scanned, that way the tech can see in real time what the computer is seeing as far as the speed of the truck, it could be something as simple as a sensor ground, to more expensive items like the main control processor. Just throwing parts on is wasting money, have it checked out by a shop of your choice, most good shops will have a scanner that can do this.

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