speedometer not working
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Joined: Apr 2005
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speedometer not working
I have 99 f-150 4x4 4.6 v-8 auto trans. Put in new computer, had keys reprogramed, speedometer did not work after that, worked before. When ecm failed I pulled truck home about three miles under thirty MPH. When i drive the truck speedometer wont work after a mile or so odomoter mileage goes off od light flashes trans shifts all right driven it over 1000 miles Is it Speed sensor or cluster? Or something else? Thanks REDBOZ
Lead Driver
Joined: Jul 2005
Posts: 5,967
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From: Eccles, WV
I believe that I would check the speed sensor on the rear axle. It is cheaper than the speedo head.
Why the new computer. Have you checked for codes?
Are you getting an antilock warning? It is also controled by the speed sensor.
Why the new computer. Have you checked for codes?
Are you getting an antilock warning? It is also controled by the speed sensor.
Elder User
Joined: Feb 2006
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From: Tennessee
Originally Posted by redboz
I have 99 f-150 4x4 4.6 v-8 auto trans. Put in new computer, had keys reprogramed, speedometer did not work after that, worked before. When ecm failed I pulled truck home about three miles under thirty MPH. When i drive the truck speedometer wont work after a mile or so odomoter mileage goes off od light flashes trans shifts all right driven it over 1000 miles Is it Speed sensor or cluster? Or something else? Thanks REDBOZ
Please let me know-
Also, when I turn on my wipers or headlights, my radio goes silent for a couple of seconds.... any ideas?
Any help is appreciated..
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Joined: Jan 2001
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From: Virginia
I am afraid to say(call the dealer to make sure) but I think you are going to have to go to the dealer to get it fixed. The speedo/cluster unit communicates with the engine computer and some other things over a communication network. They have to plug their little gizmo in and do some hocus pocus to get all the modules talking together again.
Lead Driver
Joined: Jul 2005
Posts: 5,967
Likes: 7
From: Eccles, WV
IT sounds like the GEM unit is not working correctly. This gadjet is what lets all the modules talk to each other. The only cure is a stealership. Just don't let them apply the '03 updates to your '02. It does something screwy to the engine senosrs and kills the power band.
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