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Old 03-05-2015, 09:41 AM   #1
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Speedometer quit working

I have a 1999 chassis. Yesterday while driving on a pretty rough highway, I noticed my speedometer quit working. Speed, odometer and trip meter all quit working. When this happened I also noticed my transmission started shifting irratically, at slower speeds, like it wasn, t sure what gear it should be in.

When I had to stop for a border patrol check point, I decided to try and shift manually. When I put it in 1st gear, the speedometer started working again, and everything is back to normal.

Anyone have a similar issue? Or any idea what happened here?
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Old 03-05-2015, 10:25 AM   #2
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My 1999 does the same. It may be the VSS on the differential or it may be a grounding issue. I have found that if I stop and back up 1 to 20 ft it starts working again. The TSB is TSB 2-11-03
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Old 03-05-2015, 10:36 AM   #3
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Speedometer
The electronic speedometer (17255) receives a speed signal from the 4WABS module.
Vehicle Speed Sensor (VSS)
The vehicle speed signal is generated by the rear anti-lock brake sensor and sent to the 4WABS module. The 4WABS module sends the vehicle speed signal via circuit 679 (GY/BK) to all systems that require a vehicle speed signal input.


It sounds like the 4WABS module was not sending out information. This could be lack of a VSS signal to the 4WABS module (most likely) or no power to the 4WABS module.
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Old 03-05-2015, 01:44 PM   #4
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Speed sensor on Differential is a very common problem with Fords. They are easy to replace and inexpensive. Mine (2001) costs about $10 from Rock Auto.

Google F53 rear ABS sensor
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Old 03-05-2015, 02:43 PM   #5
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When you refer to the speed sensor on the differential, are you referring to the ABS sensor on the top of the differential, or is there a different sensor?

I recently replaced the ABS sensor, because the ABS light would stay on in the instrument panel. Replacement sensor was purchased from NAPA , and it resolved that problem.
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Old 03-05-2015, 02:48 PM   #6
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Yes - Its the ABS sensor. Very top of the Differential. Spray some cleaner and wipe it off before you remove the old one to keep junk from falling in the hole.

They use that for ABD, Cruise control, speedometer, etc on newer models
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Old 03-05-2015, 07:07 PM   #7
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Quote:
Originally Posted by grldst View Post
Replacement sensor was purchased from NAPA , and it resolved that problem.
You may have to buy one from a Ford dealer to solve the problem. Others have reported that the auto part store sensors did not fix all of the VSS problems and they had to get one from Ford to make everything work right.

The Computer uses speed information from the the 4WABS module to operate the transmission.
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Old 03-05-2015, 09:16 PM   #8
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Subford, this is what I am suspecting, and is why I mentioned the NAPA replacement. Thanks for the info.
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Old 04-01-2015, 07:53 PM   #9
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Speedometer not working

I had the same problem of speedometer not working on 2000 v10 Ford. It was the ground cable from the truck battery to the frame. I cleaned the frame, the cable and put a star washer between the cable and frame. Have not had that problem anymore.
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Old 04-01-2015, 09:30 PM   #10
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Thanks for the reply killowatte....I will check the ground to the frame. However, I would think that if this ground was bad, that there would be other issues showing up.

I am currently still running with the aftermarket NAPA sensor, and aside from the one time, the speedometer has continued to work. However, one time when I exited the interstate and stopped at the end of the ramp, when I accelerated from the stop, tranny in drive, it acted like the tranny slipped. I let up off the gas and hit it again, no problem. Again I'm thinking this could be related to the sensor.
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