Odometer Just dashed Lines

[3v2000GT]

Every once in awhile my odometer will just show dashed lines (-------). Does anyone know what this means>? Also, my speedometer keeps bouncing all over the place. I got codes all pointing towards the speed sensor, i replaced that and samething, it didnt fix the problem.

Any help would be great...

tanks

Click to read more...

 

[Ear Rak]

bad tps maybe? (just a guess, and not an educated one)

 

[frdtch05gt]

Can you post up the code numbers? I might be able to help you figure out what the problem is.

 

[3v2000GT]

Can you post up the code numbers? I might be able to help you figure out what the problem is.

p0721
p0722
p0720

the main one I get is p0721 i get the others after a little driving

 

[frdtch05gt]

Which speed sensor did you replace? The one on the rear axle, or the one on the tail shaft of the trans?

 

[batman]

I'd check the one in the trans....

 

[3v2000GT]

Which speed sensor did you replace? The one on the rear axle, or the one on the tail shaft of the trans?

the one on the tail shaft. im almost 100% sure that its the trans wiring harness, maybe it shorted or something. i get not MPH reading when im going under 30-40mph then it will jump around after that.

 

[3v2000GT]

im thinking that the odo will go blank when you have a certain amount of codes, to get you to stop and turn the vehicle off. I had 5 at the time

 

[frdtch05gt]

About the only time I've seen the odometer go blank was if there was a programming problem with the pcm or a major wiring issue between the pcm and cluster. I would check all the wiring between the pcm and speed sensor, and between the pcm and cluster. Especially pay attention to any wires that are a twisted pair (network communication wires, usually shielded with a foil covering).

 

[3v2000GT]

yeah Im gonna replace the trans wiring harness and see if that fixes the speedo problem. it better..

the cars runs fine when the odo goes blank, i dont think its a programming problem, I just wish there was a definate answer for what this (------) means.....

i swear i have bad luck with this car....

 

[blubyu]

Time for a new cluster.

 

[frdtch05gt]

I'm not sure that it's the cluster itself, more likely problem is the wiring. one of the harnesses may have rubbed on something and shorted.

 

[rdsnake]

If it was a GM id send it in for a cluster but a Ford, not so much..

 

[3v2000GT]

if its the cluster why am I geting codes for the trans harness and speed sensor. I'm pretty sure the harness shorted, it is intermittently working.

 

[blubyu]

if its the cluster why am I geting codes for the trans harness and speed sensor. I'm pretty sure the harness shorted, it is intermittently working.

Hope you are that lucky. My cluster lights were going on and off intermittently (when I had the running lights on) and Ford replaced the whole cluster. I can see where that would make sense with the codes you get, but the odo and speedo thing a would make me suspect the cluster. You should drop the 100 bones and have the dealer diagnose it.

 

[3v2000GT]

Hope you are that lucky. My cluster lights were going on and off intermittently (when I had the running lights on) and Ford replaced the whole cluster. I can see where that would make sense with the codes you get, but the odo and speedo thing a would make me suspect the cluster. You should drop the 100 bones and have the dealer diagnose it.

yeah I have an 03 cobra trans wiring harness, ill try that and if that doesn't work Ill take it to ford. if i need a new cluster maybe ill have em put in a 99-01 cobra cluster or mach 1 cluster. but lets hope i dont have to spend that kind of money......

 

[qwik01cobra]

Damn well I thought I was the only one. My GF's GT is doing the same thing. I couldnt figure it out. I'm going to get that speed sensor thought and see what happens. Did you get it from an auto parts store or Ford?

 

[3v2000GT]

Damn well I thought I was the only one. My GF's GT is doing the same thing. I couldnt figure it out. I'm going to get that speed sensor thought and see what happens. Did you get it from an auto parts store or Ford?

well I'm glad I'm not the only one. I got the sensor from ford for 24. It took me about 3 min to put in. I just wish it would have fixed the problem. I'll be changing the harness Saturday we will see what happens... Fingers crossed.

 

[qwik01cobra]

well I'm glad I'm not the only one. I got the sensor from ford for 24. It took me about 3 min to put in. I just wish it would have fixed the problem. I'll be changing the harness Saturday we will see what happens... Fingers crossed.

Cool thanks for the info. let me know if you get yours fixed

 

[3v2000GT]

Cool thanks for the info. let me know if you get yours fixed

Yep I'll be sure to do that. Let me know if you figure anything out as well. :biggthump

 

[3v2000GT]

figured out that the trans harness is causing the odo to go dashed lines. upon intial start up and drive i get p0721 and after driving 10-15 miles i get 3 codes p0721,p0720 and p0722 that have to do with the trans harness, which causes the odo to go blank. so just to make sure i unhooked the trans harness and cleared the codes and drove around, this time it didnt take 10-15 miles for it to do it it was more like .2 miles for my odo to go dashed lines and i got all the same codes right away/.

so this leads me to beleive that dashed lines means- that there is something wrong with a certain harness, in my case its the trans harness.

 

[blubyu]

figured out that the trans harness is causing the odo to go dashed lines. upon intial start up and drive i get p0721 and after driving 10-15 miles i get 3 codes p0721,p0720 and p0722 that have to do with the trans harness, which causes the odo to go blank. so just to make sure i unhooked the trans harness and cleared the codes and drove around, this time it didnt take 10-15 miles for it to do it it was more like .2 miles for my odo to go dashed lines and i got all the same codes right away/.

so this leads me to beleive that dashed lines means- that there is something wrong with a certain harness, in my case its the trans harness.

Sounds like you are on to something!