Speedometer reading 6 mph at stop

[RangerG]

Has anyone else had this problem? Speedometer ready 6 mph at dead stop.
I have 37” BFG’ s and 4.88 gears. The computer has been programmed for this. Going down freeway noticed it was reading 84 with the cruise set at 75. Used my phone to check actual speed , it was dead on at 75

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[TheRealGinjaNinja]

Had this issue come up frequently on my 2018 JLUR. Of course the dealer could never fix it. My 21 Gladiator has been perfect. Is your Gladiator an earlier model?

Cheers

 

[Lunentucker]

How was the computer reprogrammed and by whom?

 

[Mr._Bill]

Does it read the wrong speed on both displays?

 

[RangerG]

How was the computer reprogrammed and by whom?

I did with the super chip programmer

 

[RangerG]

Had this issue come up frequently on my 2018 JLUR. Of course the dealer could never fix it. My 21 Gladiator has been perfect. Is your Gladiator an earlier model?

Cheers

Bought it in November 2020

 

[RangerG]

Does it read the wrong speed on both displays?

Both displays? Only looked at the analog display

 

[Lunentucker]

I did with the super chip programmer

Not familiar with that one. I know mine can use your tire size, GPS, or you can enter an offset.
I guess an offset would maybe explain your issue

 

[TheRealGinjaNinja]

Both displays? Only looked at the analog display

On my JL the digital was correct but the analog read high. I’d recommend taking pics or video of it and bring it into the dealer it’s a warranty item. Aftermarket programmer won’t fix it.

 

[Mr._Bill]

Both displays? Only looked at the analog display

I look at the speed on the center display. The dial is partially obscured by the steering wheel so I usually ignore it.

 

[Kevin_D]

I had a truck that did that.
It ended up being a bad speedometer.

Kevin

 

[Vtur]

The analog always read couple miles higher is due to a design flaw. The distance between the needle and dial is too great. It's actually correct when stare at it perpendicular.

 

[Hootbro]

The analog always read couple miles higher is due to a design flaw. The distance between the needle and dial is too great. It's actually correct when stare at it perpendicular.

6 to 9 MPH off is a lot of parallax error.

 

[Minty JL]

Had this happen to my 19 JLUR the day after I programmed it with my ProCal.

I plugged the ProCal back in, ran through the setting again, road tested and power cycled everything a few times.

It's been fine since then.

 

[TroutFishingInAmerica]

About a year ago mine was wacky for about 2 days. The analog was reading 10 mph more than the digital, even stopped. No aftermarket programming, all stock, no codes. I set up an appointment with the dealer, the next day it's back to normal, I cancelled the appointment, haven't had any problems since. With no codes and issue gone it's hard to guess what caused it, hasn't returned but it was strange.

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