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Originally Posted by rriley
I had the same problem yesterday the answer to your problem is the RWAL sensor located on the top of the rear axle housing it is another speed sensor after I installed it i cleared the codes the speedometer works odometer works and brake light is out abs out. cost me 44.00 from dodge dealership.
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I had the same problem the other day after I had gone muddin' in my 99 Ram. I had called a friend of mine that does all of the POS automotive computer tuning at HyperTech, and he said that sensor was crap. Anyway, it'll come unplugged very easily. In my case, it had gotten some mud slung up in there.
I just took a toothpick (actually it was a pen cap, but a toothpick would work best) and cleaned out around the sensor, blew it out, and then plugged it back in. It would probably be best to try this before going out and buying a new one.
The best way to reach that sensor is (when facing the tailgate) go to the right side of the truck, lay flat on your belly, scoot under the truck army style, and contort your back and limbs in such a way that you are looking down on top of the rear axle housing. I actually rested my cheek on the driveshaft. I have a 4x4 so it sits higher than some other rams, you may have to jack it up.
Doing this also made my ABS and BRAKE light go off, and my speedometer and odometer work properly. My check engine light also came on while the sensor was unplugged and is still on, but I was also told that it was related to the sensor being unplugged, unless I am just so unlucky that something else went bad at the same time.