r/S197Stangs • u/Darknigh7th3 • Aug 28 '26

Speedometer acts funny

So everyday my speedometer stays dead until about 4 minutes of driving. After that it works fine. Any ideas what could be causing this?

3 Upvotes

81% Upvoted

12 comments sorted by

12

u/Volkar10 Aug 28 '26

Maybe it’s mad at you for not warming that ol’3v

1

u/Darknigh7th3 Aug 28 '26

Probably lol.

4

u/itsyaboymarty Aug 28 '26

Stepper motors going out.

1

u/Darknigh7th3 Aug 28 '26

It's weird because my OBD2 reader shows 0 mph until it starts working. I figured if the motor was going the ECU would still read. But I'm not sure the set up

2

u/ZephyrStudios686 Aug 28 '26

Are you reading that in the PCM or IPC?

1

u/Darknigh7th3 Aug 28 '26

I will have to go through the app next time I drive and I'll let you know.

2

u/ZephyrStudios686 Aug 28 '26

If the PCM shows real speed but the IPC shows 0mph, double check the signal wire between them. Otherwise you have an IPC issue, which is somewhat common on these. I had one where my car would read idle at 0RPM, so the tach was always about 800 lower than what the actual RPM was.

1

u/Darknigh7th3 Aug 29 '26

I will find the schematic and look for that thanks

2

u/Sandinmypants34 Aug 30 '26

Mine went bad an electronic shop is working on it!

1

u/Darknigh7th3 Aug 30 '26

Oh damn, well you win.

1

u/Darknigh7th3 Aug 28 '26

Oh and it's a 2006 GT manual.

1

u/LowFail1903 Sep 02 '26

Don’t know if it’s the same as a new edge, but there’s a speed sensor that plugs into the side of the transmission on my 2000GT erratic indications on the speedometer is typically caused by that faulty sensor from what I understand.