SOURCE: 2001 dodge ram 2500 abs light stays on and soo doe
I had the same problem and it turned out to be one of the front speed sensors and the rear speed sensor as well. If you get a chance to look at all the speed sensors make sure the wires on the front aren't burnt from hot brakes. I have an 01 3500 4X4 and it was a pain to change the front sensor but the rear sensor took about 5-10 minutes, it's located in the middle of of the rear axle right on top. I bought both of mine on Ebay and cut the price in half.
SOURCE: 2006 Dodge Ram 2500 diesel truck----need inside fuse box diagram
If you are looking for the fuse box diagrams or any other diagrams for your Ram, check promanuals.net for a factory service manual for around 20 bucks or so. It's an invaluable tool for my Ram 2500.
SOURCE: 2006 dodge ram 2500 a/c fuse rely
The AC relay is located in the under hood fuse box. The cover should have a legend for location. Its one of the bigger black ones. You can rotate it with the horn or ABS one to see if its the problem. You may have a small fuse also in that box for it. If this doesn't solve the problem then you either have a leak or a computer problem. What a shop will do is try with a bidirectional data scanner turn the AC on. If they can't get it to turn on with a scanner then you most likely have a failed PCM if they verified you do not have low pressure or a relay or wiring or switch issue.
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