I have a 2000 ford f350 7.3 diesel the speedometer is jumping abs light is on and overdrive flashing. and the Ford house can't get a code to tell them whats wrong. I have replaced the ABS and the Speed sensor still not luck.
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Your best bet , take it to a qualified repair shop. The
overdrive off light flashes is telling you that the transmission has a problem an code's are set in the transmission control module or PCM - engine computer . Speedometer an odometer not working could mean speed sensor is bad . Checking code's with a factory or professional scan tool is need . The heater fan not turning off is a seperate problem , relay stuck closed maybe . Is it running at high speed ?
Had the same exact issues with my 2000 Diesel. Windshield seal was no good, water was getting to electronics. I replaced the windshield and all the problems stopped.
sounds like the speed sensor on the back of your tranmission housing has gone out or is starting to. i would visit ur local tranny shop n have it checked out also when the overdrive light is flashing usually means there is any issue with drive n overdrive but can also be included with just the speed sensor issue
It sound is if your ABS/Speed sensor is the culpret. Try this fairly inexpensive repair before you bring it in for a Diagnostic, which can run anywhere from $89.95 & up. Go to the local ford dealer in your area and ask them for the ABS Sensor in your rear axle differential. The base part number being 9E731. This part runs roughly for about $20.00+ and your own time to replace it.
Check you speed sensor on the transmission, Overdrive wont work without speed sensor, nor will ABS, or Speedometer.. it all boils down to a speed sensor.
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