How to Lower TPMS PSI Warning Level
10-20-2017, 01:22 PM
#11
Senior Member
I know most cars/trucks that the TMPS, looks at your SPARE tire as well, if that is low or at 40+ and your others are at 35--it may throw a message, so check your spare tire!
10-20-2017, 01:40 PM
#12
5.0 DOHC V8
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I don't know if the spare tire on our trucks is an influence on the dash readout. I think the TPMS wheel-mounted sensor/transmitter has to be revolving/in motion.
Either way...
If using FORSCAN isn't in your immediate plan, you can always purchase a Superchips Flash Calibrator. For +/- $200 you would have the ability to adjust your TPMS pressure warning level, adjust for your new tire size overall diameter (your speedometer and odometer accuracy depends on this) -and- have the ability to read Diagnostic Trouble Codes. You may be able to access all of this via FORSCAN, too, but you may need a laptop, etc.
Good luck.
Either way...
If using FORSCAN isn't in your immediate plan, you can always purchase a Superchips Flash Calibrator. For +/- $200 you would have the ability to adjust your TPMS pressure warning level, adjust for your new tire size overall diameter (your speedometer and odometer accuracy depends on this) -and- have the ability to read Diagnostic Trouble Codes. You may be able to access all of this via FORSCAN, too, but you may need a laptop, etc.
Good luck.
12-18-2017, 09:27 AM
#14
Well, my placard reflects 265/60/18, 110T (Hanooks) and calls for 43psi. This is for a 2017 XLT, two wheel drive truck. The new wheels and tires are 275/55/20s 113H (Michelins) and came DIRECTLY off a 2017 King Ranch F150. Those vehicles indicate 36psi to be the correct pressure.
Thus, both the speed rating and the load rating of the new tires are higher than what was on the truck when I bought it.
Bottom line of all this, I suspect, is my truck's system still thinks have the original tires calling for 43 psi on it. Notably the warning light did not come on until a cool morning when my "new" tires were at 33psi (quickly back up to 36psi later that morning). If all it takes is a quick reprogramming hopefully the deal will do it when I take the truck in for its door recall. Alternatively I know a mechanic who may have the Forscan tool.
Thus, both the speed rating and the load rating of the new tires are higher than what was on the truck when I bought it.
Bottom line of all this, I suspect, is my truck's system still thinks have the original tires calling for 43 psi on it. Notably the warning light did not come on until a cool morning when my "new" tires were at 33psi (quickly back up to 36psi later that morning). If all it takes is a quick reprogramming hopefully the deal will do it when I take the truck in for its door recall. Alternatively I know a mechanic who may have the Forscan tool.
I’m kind of in the same situation. I had the Hankooks and my door jamb said 43psi. Now I have Nitto tires in 275/55/20 117T XL
Not sure what pressure to use now
12-18-2017, 09:20 PM
#16
Senior Member
12-18-2017, 10:30 PM
#17
Senior Member
On my F250 I adjusted the pressure 1 psi at a time until the light stayed out. My rear tires had a 15 psi spread. Just make sure your adjusting the psi when the tires are cold. Adjust when tires are hot, the light will trigger after the tires cool down.
12-19-2017, 07:54 AM
#18
Senior Member
At the advice of every tire manufacturer that we carry, my shop will only install tires that meet the criteria of the door placard. Period. That includes the load index, tire pressures, and speed rating. We will modify tire sizes as requested by customers as long as the new size meets the placard criteria.
That being said, most tires already meet said criteria. Generally speaking there are normally many tires by many manufacturers available to choose from. Indeed there are a few 1/2 ton trucks that have out of the ordinary specifications and therefore a slimmer selection.
The TPMS and corresponding door placard thing became an issue thanks to the Firestone/Ford exploding rear tire thing. Followed by the eventual mandating tire pressure monitor forced by the government starting in 2008.
That being said, most tires already meet said criteria. Generally speaking there are normally many tires by many manufacturers available to choose from. Indeed there are a few 1/2 ton trucks that have out of the ordinary specifications and therefore a slimmer selection.
The TPMS and corresponding door placard thing became an issue thanks to the Firestone/Ford exploding rear tire thing. Followed by the eventual mandating tire pressure monitor forced by the government starting in 2008.
Last edited by D2Abbott; 12-19-2017 at 07:56 AM.