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Speedometer working backwards!

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kiltkop

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Discussion starter · #1 ·
This is for a 2001 Durango SLT 4.7L.

The speedo always starts and rests at 120 mph. When I drive it starts to move at about 30 mph(per GPS) and stops at 80 mph, backwards mind you. What the heck is going on? This has been happening since I bought the truck used. I have replaced all the speed sensors in the diff and tranny and still no solution.

What gives?
 
#2 ·
Sounds like somehow the signal for the speedometer has been reversed.

Are you the original owner? Did you buy it this way? Did it just start doing this? Did you do anything prior to this occurring? Some background would help. ;)
 
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#3 ·
You bought the truck knowing this? Did you not test drive it first? If you test drove it, what in the world told you to buy it like that?
 
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#4 ·
Rebel13 said:
You bought the truck knowing this? Did you not test drive it first? If you test drove it, what in the world told you to buy it like that?
Click to expand...
Well, to be honest, if that was the only thing wrong with it when I bought it, I'd just fix it somehow. A messed up speedometer wouldn't keep me from buying any vehicle, as long as that was like the only issue.
 
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#5 ·
HOld the trip reset lever, and turn the ignition on, then release the lever.

The speedometer should cycle through a self test, resetting all the gauges.

See if that fixes it.

It is odd, but I have had a few occurances when I remove the battery, somehow the speedometer gets pegged at 120mph, and won't come back until I do the reset. Go figure.

It was also -37°F, according to my overhead console, yesterday. I thought that was odd, since it was really ~113°F, when I drove by a sign. :jester:
 
Discussion starter · #6 ·
Rebel13 said:
You bought the truck knowing this? Did you not test drive it first? If you test drove it, what in the world told you to buy it like that?
Click to expand...
The truck was not running when I bought it. I paid $1000 for it, $650 for a used motor with 30,000 miles less than the dead one. Including registration, engine, fluids, and purchase price, I paid $2600 for this truck, so the price was right.
 
Discussion starter · #7 ·
emjohn4 said:
HOld the trip reset lever, and turn the ignition on, then release the lever.

The speedometer should cycle through a self test, resetting all the gauges.

See if that fixes it.

It is odd, but I have had a few occurances when I remove the battery, somehow the speedometer gets pegged at 120mph, and won't come back until I do the reset. Go figure.

It was also -37°F, according to my overhead console, yesterday. I thought that was odd, since it was really ~113°F, when I drove by a sign. :jester:
Click to expand...
I have tried that reset. It works for all the gauges except the speedo. It just bounced backwards from 120 to 80 then 120.
 
Discussion starter · #9 ·
devinpitcher said:
Sounds like somehow the signal for the speedometer has been reversed.

Are you the original owner? Did you buy it this way? Did it just start doing this? Did you do anything prior to this occurring? Some background would help. ;)
Click to expand...
Second owner, did not know it was broke. It has been doing it since the day I fired it up. I had to replace the motor due to it's catastrophic failure. It dropped a valve seat in piston 1 and a chunk of something destroyed piston 7. It sat for at least a year in the PO's driveway and she let me have it as is for $1000.
 
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