RE: Brake and ABS Light help!!!!
I had the same Durango, 5.9L, 4WD, with the same problem, as well as a lack of speedo below 20 mph. I had to change the rear wheel speed sensor (screws right in towards the top of the rear differential.) Took about fifteen minutes with an open end wrench, not difficult at all. This took care of the ABS and brake light problem. However, this does not get rid of the error code that is logged into your computer. Disconnecting the battery does not clear the errror code either. The only way to get rid of the code is to plug in a DRB reader, just under the dash area, to the left. This takes about five minutes, and a repair shop did it for me free of charge. It is up to you whether or not you can score the same deal. Anyway, there are several other threads in this forum that show usually it is a problem with the speed sensors that give you the warning lights. More often than not, a rear wheel speed sensor is the culprit, although rarely it is also caused by an output shaft sensor (found on the transmission, again 15 min. fix, a bit messier) and the front wheel speed sensor (found near the steering nuckle on each front wheel). The rear sensor is probably your best bet, and can usually be found at Autozone in stock for about 24-30 dollars, Kragen for a little less, but they usually need to order. Try one of those first, unless you want OEM, which runs about 48-56 dollars. I'm just a garage mechanic, but I did alot of research because I was in the same boat as you, and didn't want to pay anybody alot of coin to do something I was capable of. Good luck, hopefully this will help you.