GPS error due to 37" tires?

[tec548]

Not sure what you mean

It's also possible that on that screen it polls constantly.

You are correct

so it is doing what i thought it was.

 

[The Car Stereo Company]

not that it would help, but the vss wire is in the pcm. passenger side of the engine compartment on the firewall. its in a 50 pin plug. eiter pin 25 or 14. its a brown/green

 

[Cleave]

The GPS system uses a lot of in vehicle sensors to simulate GPS tracking in case communication to the GPS satellites is lost, vehicle speed, the different roll rate sensors, the steering wheel angle sensor, and many others, most likely what is happening with the 37" tires is that all the vehicle sensors are saying you're going X miles per hour, while the GPS satellites are saying you're going 3 miles per hour faster than the sensors say, modern vehicles are programmed to ignore the one input that doesn't match up to all the others to try to prevent minor failures from putting you on the side of the road for 3+ hours, the GPS system thinks all the vehicle sensors couldn't be wrong all at the same time, so the GPS satellites must be wrong, so it ignores the input from them and tries to keep track of your vehicle with the in vehicle sensors alone, which is why the GPS is falling behind, nothing is wrong with your GPS, the GPS just thinks there is, usually ford has programs for +1 and +2 tire sizes, a dealership should be able to reprogram your control modules for the larger tires

 

[Nick@Apollo-Optics]

I find it hard to believe that Ford can't adjust for tire size. My cousin just changed from 31" to 33" tires on his 2013 F-150 and wants to go get the speedometer calibrated and three different dealerships quoted him about $100 to do it.

 

[ToucanLife]

I have the same problem with my 13' with 37" BFG

 

[badmonkey]

I just installed new 35" tires and now, I'm having this issue. My tpms isn't working, yet. I've tried the factory re-learn method, but to no avail. I'm going to try a local tire shop to see if they can get the PCM to recognize the new sensors. Could this be related to the tpms sensors?

 

[WReX24]

I'm experienceing the same issue, and I'm still running the stock tires, always have. I just noticed it within the past couple of weeks. The gps will display my position a few hundred feet behind where I actually am, and if I make a few turns, it gets completely confused by trying to lock back onto a road that I'm not actually on.

This is frustrating.

 

[tec548]

The dealership has had my truck since Friday. No news yet. I'll let you know what they find.

The TPMS sensors can be set by the dealer if they are OEM. I had no problem with this one.


++++ Just got a call from the dealer... I can pick-up my truck... they can't fix it! Wow...

I have the SCT tuner does anyone know if any of the shops out there can reprogram for tire size to fix the speedo? To be clear I know that the tuner has rev/mile adjustment in the options menu... this is for transmission tuning and does nothing for the speedo.

Anyone?

 

[Jordan@Apollo-Optics]

SCT Tuner can adjust for damn near everything. If it's accessible with the OBDII connector, they can adjust it.

 

[Orionkhan]

The dealership has had my truck since Friday. No news yet. I'll let you know what they find.

The TPMS sensors can be set by the dealer if they are OEM. I had no problem with this one.


++++ Just got a call from the dealer... I can pick-up my truck... they can't fix it! Wow...

I have the SCT tuner does anyone know if any of the shops out there can reprogram for tire size to fix the speedo? To be clear I know that the tuner has rev/mile adjustment in the options menu... this is for transmission tuning and does nothing for the speedo.

Anyone?

Did the dealer even try to calibrate the speedometer to compensate for the 37" tires?