I have the exact problem and replaced the rear speed sensor but that did not fix it. When it is really cold outside the speedo will sometimes work on and off. But after the truck warms up the speedo stops abs light on and the overdrive light flashes. IT seems to be a loose connection but I have no idea where to start.
Ok one thing to do is scan codes to see which sensor is not reading. then go to it with a scanner hooked up. youre gonna be able to see live moh parameters or windows to see live data anyhow access the rear which isnt working. jack up truck safely put in drive then proceed tothe rear sensor wire. u can do this at any sensor that isnt reading. u then look at the mph window in scan tool an watch it while u wiggle the affected sensor wire goin to the harness. watch for jumps an droputs of the mph parameter while wiggling sensor wires from sensor all the way to the harness. thats how its done looking for broken wires. food luck hope this helps
SOURCE: 99 f250 SD 7.3
Your speed sensor in your trans. needs to be checked out sounds like its not working or not getting a good signal until its generating enough power and speed to start until it reaches 30 MPH. Check that out sometimes it could just be some dirt on it. It all makes sense the ABS light is on because its not reading the speed of the tires, and the AOD light is on because It has no idea when to shift into overdrive without knowing how fast its going. I sure Hope that Helps You Out, And Thanks, Bear001
SOURCE: abs light on
I'm a Ford service adviser. There are many reasons for the
abs warning indicator to come on. The usual cause is from a
faulty speed sensor. Either a wheel speed sensor or the
differential speed sensor. I don't think the light is related to your
vandalism. You might want to take the truck to an auto parts store and
have them read the codes for you. Most auto parts stores will do this
for free.
Good Luck
SOURCE: overdrive lockup
On the passenger side of the trans there are two servos.A servo is a steel piston with rubber lip seals bonded to the steel.The servo piston strokes in or out,applying or releasing a band.There are two servos,each hidden behind circular aluminum covers held into the case with snap rings.The rear servo actuates the 2nd gear band,and the front servo actuates the 4th gear,or O.D. band.The rubber lip seals on the servo pistons are soft and pliable when new,but with hot and cold cycles,and years of use,the rubber hardens and doesnt seal very well,causing loss of gears.It is very possible the servo has hardened,and that's why you are losing 4th.The other possible cause is electronic.This trans,the A4LD has 2 electrical solenoids inside the trans,4th gear solenoid and lockup solenoid.These are the ONLY electronics inside the trans,another possible problem area.I would remove the servos first for inspection,but before removal,take a scribe and scratch into the aluminum covers,"F" on the front one,and "R" on the rear one.These servos are different diameters,and MUST go back where they came out of.On the servo covers you will see cast into the covers 2 letters identifying the servo it requires....AB.....BB.....ZC...etc.These are examples,and yours will likely be AB and BB.If you DIY....use plenty of vaseline on the rubber lip seals,and the servo bores, to prevent cutting the new servo seals and O rings.Good luck.
SOURCE: f-250 dash
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.
SOURCE: F250 Ford 7.3 L Powerstroke Hard to Start Cold
I have a 2000 F250 with Powerstroke and my buddy has a 02 with same engine. Both of us have had the same problem. There are two coils (look like starter coils) on top of the engine that can be seen from the passenger side of the truck. The shorter of the two, has to do with supplying voltage to the glow plugs. When this coil gets older, it breaks down causing a higher resistance in the circuit. Which reduces the volts that the glow plugs see. In turn resembles a problem with the plugs. My buddy and I changed the coils and both trucks start like new. The part cost $80-$90. and can be changed in less than 5 minutes. Glow plugs are a lot bigger job and more expensive.
849 views
Usually answered in minutes!
×