05 Speedo has gone crazy.

[Menace-01GT]

My wife's 05 v6 stang's speedometer is not working properly. Sometimes it just stays on 0, other times it says we are going 20 when were are going 60, sometimes we are at a complete stop going 85. The odometer works fine still. Any ideas on where to start on this problem? I guess the speedo is not mechanical since it sometimes works, a broken cable can't sometimes work.

Thanks.

 

[sahtt57]

There is no way to know for sure whether it is a sensor or a wiring issue, but the Mustangs after 2000 have often had issues with the speed output sensor located on the transmission. There is more here, it's a fairly common issue.

 

[Menace-01GT]

There is no way to know for sure whether it is a sensor or a wiring issue, but the Mustangs after 2000 have often had issues with the speed output sensor located on the transmission. There is more here, it's a fairly common issue.

Thanks for the info!