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Old 08-22-2015, 03:30 PM   #1
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Default F150 Tire Pressure Monitor Sensors

I'm going with a LT Tire for travel trailer towing which replaces my factory delivered Passenger (P) tires.

Ford is useless, they say the TPMS maybe damaged by LT tires but can't be certain. So my dealer said they can't back them up if Ford can not reassure that they will be OK with LT Tires.

I'm not going with Ford since they refuse to back anything damaged, if not putting the exact same tires on that came with the truck from the factory. I'm not paying a grand for tires I don't want.

I'm going with a Load C (Goodyear Wrangler Adventure with Kevlar) since 50 psi is the tire pressure required for max load. A Load E requires 80 PSI for max load which Ford and most tire stores say may rupture the wheel.

Anyhow, no one really knows for sure if the TPMS will bring in an alarm for "HIGH" pressure. Since the standard P tire is 35psi for max load and the LT tires require 50psi for max load, there's a chance that the chime and dash display alarm will come in. I don't want that.

I thought the TPMS were for only low pressure. So will alarms come in with high pressures as well?

Thanks for the help.
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Last edited by Mike Up; 08-22-2015 at 03:32 PM.
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Old 08-22-2015, 03:39 PM   #2
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Your ford is full of crap. Damage to the TPM sensor isn't done by the type of tire but by the technician doing the work. If he/she just takes the tire off without concern about where the sensor is compared to the tire bead then they will damage the sensor.
I haven't been impressed with anyone's stories from dealers lately. I moved my tires on stock wheel to LT275/65r20. I run 50 psi and have no issues from the TPMS. NO messages what so ever.
Take it to a more competent shop. I do business with a local tire shop for my wheels and tires, they do tires all day long/everyday so I would consider them more experienced than the dealer.
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Old 08-22-2015, 03:46 PM   #3
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Someone might be able to confirm but I believe you'll get a tpms fault light if the pressure is way too high, how high i'm not sure. I wouldn't run the tire at the max rating either you'll usually have to play around with pressure to get the correct one when changing to an LT tire and especially changing load ranges. I run my load range D tires at 50psi but the max pressure is 65psi. You can have you're TPMS reprogrammed with a ford IDS scan tool to a new pressure. I have my TPMS light set for 48psi, you can set it up to 80psi.
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Old 08-22-2015, 03:46 PM   #4
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I am not a tire expert but I have never read of TPMS warning of over inflated tires. I had LT load range C tires on my 1995 Dodge 1500 and never had a problem with 50psi inflation. Those tires were limited to 75mph by Goodyear. So be careful to check yours.
My truck now (see sig) has load range E tires. Recommended pressure is 60 rear, 55 front. Mak pressure on the sidewall is 80psi. I do not know of any prohibition against using that pressure. With the Kenwood DNX890 and Maestro module I can see each tire pressure any time I want. That is how it should be. y tires typically pick up 5 psi when warm.
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Old 08-22-2015, 03:47 PM   #5
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Quote:
Originally Posted by rymax101 View Post
Your ford is full of crap. Damage to the TPM sensor isn't done by the type of tire but by the technician doing the work. If he/she just takes the tire off without concern about where the sensor is compared to the tire bead then they will damage the sensor.
I haven't been impressed with anyone's stories from dealers lately. I moved my tires on stock wheel to LT275/65r20. I run 50 psi and have no issues from the TPMS. NO messages what so ever.
Take it to a more competent shop. I do business with a local tire shop for my wheels and tires, they do tires all day long/everyday so I would consider them more experienced than the dealer.
I'm going to go locally. Most today have proven to know little but one tire chain impressed me, so I'll be ordering my tires from them.

Dealership is great. They honestly told me they know little about tires and recommended a specialty tire shop. Ford is the ones with issues. They provided no support if the TPMS would work. Ford, not dealer, said they could be damaged. Since Ford said that, if a tech did damage them, it gave them a way out which I wasn't comfortable with. So I'm going to a local shop.
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Old 08-22-2015, 03:50 PM   #6
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Every shop today said some TPMS systems have high pressure warning as well. None knew for sure if the F150 had the high warning or not. They said usually on more expensive vehicles.

I need to air to 50psi for max rating which is equal to what my factory P tires max ratings were After 9% drop for light truck work rating. Never new P tires rating must be lowered by 9% if anything other than carrying passengers is done. That's why they are passenger tires. Found that out from manufacturers and dealers websites.
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Old 08-22-2015, 04:18 PM   #7
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TPMS only alarms on low pressure, you can put as much in as you need, just don't fall below the programmed setting.
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Old 08-22-2015, 04:22 PM   #8
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I doubt that the Ford TPMS has a high pressure warning. The Heavy Duty Payload Package truck tires are rated for higher pressure commercial tires, and have the TPMS. I doubt that they specify a different system for the regular F150 and the Heavy Duty Payload F150. You might have a dealer check the part numbers for the standard sensors and those on the Heavy Duty Payload Package tires.
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Old 08-22-2015, 04:26 PM   #9
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All pressure sensors on late model Fords are 315Mhz, the frequency is the only specification for them to work, as for how the system works see this link.. http://www.f150forum.com/f38/how-do-...0/#post4284192
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Old 08-23-2015, 03:33 PM   #10
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The FoMoCo dealership service department should be able to adjust the TPMS limits with IDS (Integrated Diagnostic System) as Rnlcomp indicates in the provided link.
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