Recalibrate speedo and lower TPMS limits for new tires

[BigKahuna]

Are dealers able to do this? Putting 295/65-20’s on a 2020 3500SRW and would like to be able to run the rears lower than the 62psi that triggers the low air warning.

Edited April 10, 2021 by Camstyn

[GMC4Zee]

You used to be able to do it with aftermarket tuners but because GM has encrypted the ECM it has to be a dealer thing. Probably charge $50 to do it too!

 

[BigKahuna]

Speedometer seems deadly accurate now with the 295/65-20’s, go figure. I never checked it with the stock tires.

[kylant]

21 hours ago, Camstyn said:

Speedometer seems deadly accurate now with the 295/65-20’s, go figure. I never checked it with the stock tires.

my speedo is dead accurate after going to 295/65-20s from the stock 275s. GM was getting less warranty coverage with stock tires

 

I had the dealer lower the TPMS psi thresholds on my truck. no questions asked. 

so people say you can recalibrate the sensors with the cheap Amazon TPMS tool. I don't buy it. the thresholds are programmed in the truck computer. the cheap amazon tool just relearns the sensor location after a tire rotation

[BurlyHD]

7 hours ago, kylant said:

my speedo is dead accurate after going to 295/65-20s from the stock 275s. GM was getting less warranty coverage with stock tires

 

I had the dealer lower the TPMS psi thresholds on my truck. no questions asked. 

so people say you can recalibrate the sensors with the cheap Amazon TPMS tool. I don't buy it. the thresholds are programmed in the truck computer. the cheap amazon tool just relearns the sensor location after a tire rotation

Curious what you changed thresholds too?

[kylant]

17 hours ago, BurlyHD said:

Curious what you changed thresholds too?

55

[kylant]

17 hours ago, BurlyHD said:

Curious what you changed thresholds too?

55. I requested 50, but for some reason they put 55

Edited April 13, 2021 by kylant

[kylant]

whoa, website tripping out