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Haven't posted before. Just realized I've been wasting a great resource. Hope I can contribute somehow from now on. I have a 2002 dodge 2500 cummins HO 6 speed 4x4 ref cab long bed, factory leveling kit stock truck, 290k plus miles, no mods. Throwing codes 0500-1693 I live in southern Oklahoma and making a run to the east coast with a trailer. Fixing to leave and Speedo and cruise go out, lift pump quits, never had heat but figure I'll be needing it. So I'm trying to get them all fixed before I go. Heater is probably blocked as both lines are warm going in. fixed some leaks in the air line so doors finally working. Had a lifetime warranty on an autozone lift pump but went to O'Reilly's, got their pump, but fixin to order the FASS DDR-New draw draw-clean tank-mount pump near fuel tank. Main thing is I can't figure out the Speedo. I suspect a bad connection around the ccd or can-bus..Idk. I replaced the sensor on the rear diff. Nothing. Codes 0500 and1693 are only codes. So besides the rear diff, I'm not sure where to look. I've downloaded shop manual, which says there is no vss. Any suggestions would be welcome. Latest thought is add a program that can read and wipe codes, add high idle, improve all around performance. If I can get Speedo fixed that gives me cruise and odometer(fuel gauge never worked, will replace whatever's not working when tank is dropped for draw straw). So, any suggestions on Speedo are appreciated. Is the FASS DDR best way to go? Programmer recommendations? (Never had one...) Thanks in advance to anyone even reads this.