Speedometer not working

[jeffro312]

So Friday it was fine sat was parked all day now Sunday my speedometer won't go above 20 cruising at 60 reads 5-10.

Anyone have any ideas is this a dirty sensor kind of thing where is sensor


In park stopped I see 10mph

Any help I'd appreciate it tried a search didn't see anything

 

[The_Roadie]

Nah. You're not new here are you?

Classic bad gauge stepper motor. Recommend changing them all if you change one, assuming you have soldering experience/tools.

GMTNation - How to change a stepper motor

If not, choose one of many Ebay repair vendors and spend $100-125 to get them swapped with a good batch.

 

[jeffro312]

Could the stepper motor has intermittent problems because now it is working

 

[christo829]

Could the stepper motor has intermittent problems because now it is working

Yep. they can definitely be intermittent. My voltmeter would sometimes work fine, then stick, then work fine again.
It hated temps above 95F or below 25F as well. My temp gauge had started to get flaky as well. One telltale sign is that they don't
return to zero when you shut the vehicle off. Swapped all of them out, and no problems since.

Good Luck!

Chris