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Discussion Starter #1
Alert came on so I checked the tires and they were all the same 27.5 psi. Have had the MKC for a few weeks, put about 500 miles on it. Door sticker says 35 psi for front and rear tires. I went with 32 for now. Anyone know why the dealer would have put them at 27.5? Could the alert been because the weather got cooler and the pressure dropped just enough to trigger it? Once I brought them up to 32 the alert went off. What psi are you running in 20 inch tires?
 

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Yes, as ambient temperature drops, due to change of seasons, so will your pressure ...and it will stabilize. But note these types of rims are known to leak air, on occasion, but usually as they age or as you 'hit' things.
Plus I do echo DRM, fill your tires to recommended level. I usually put in one extra pound for better gas mileage. If the pressure is too low you will get uneven wear.(or too high)
 

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Discussion Starter #4
No reason, wanted to post here and see what kind of input I got before I went to the limit. Why would the dealer only put 27.5 psi in? I am sure this was done on purpose because it was consistent in all 4 tires and if it had been from air loss it would not have been equal.
 

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I never trust the dealer or anyone else for that matter, to fill my tires to the correct PSI. I always check after having anything done with my tires. More than often they just fill them to the max. Not sure why they would have under filled yours so much. Could just be a case of a lot boy doing it and not checking the sticker inside the door. I always use the recommended tire pressure from the manufacturer. I assume that they have done quite a bit of testing to come up with the PSI that provides the best handling, ride, gas mileage....
 

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Why would the dealer only put 27.5 psi in? I am sure this was done on purpose because it was consistent in all 4 tires and if it had been from air loss it would not have been equal.
Your tire gauge or theirs or both could be wrong. If their gauge was reading low and yours is reading high then you would get this situation. Cheap gauges are just that. And yes change in outside temp will effect all of them the same.
 

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Discussion Starter #7
Good point about either their gauge or help being inaccurate. You like to think people would take care in their tools and work but we all know how that goes. When I checked the tires and they all showed the same 27.5 psi I immediately got another gauge and double checked and got the same readings. My gauges are digital so if one was out of spec it should show up. I agree with going with the spec provided by the manufacturer but it was so far out of spec that I wanted to make sure there was not something I was missing. Thanks for all the input, first time we have had tire pressure alert system in a vehicle so new territory.
 

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My first service experience with my dealership was somewhat related. Driven the car off the lot in Sept. '16, had the TPMS light came on a week or so later after a cold night. Reading with my tire pressure gauge reader revealed that ALL four tires were low. Turns out the dealer were so busy selling me the car that literally rolled off their delivery truck that day they didn't even had time to do the initial inspection of the car. Thankfully nothing else was out of spec and no problem with the car afterwards. But yes, I wouldn't trust the dealer on things like that either.
 

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I always put the recommended pressure as displayed on the door plate....in this case 35 lbs. I also check the cold tire pressure the next day after the dealer or tire place have adjusted the pressures.
 

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The dealer wanted you to have a very smooth ride.....

Put MFG recommended pressure... mine is 36 PSI .


Jim
 

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Tire pressure recommended on door sill plate?

I do not agree with those suggesting tire pressure on door plate. I use recommended pressure on tire. After all the tire is the thing holding the pressure not the car body. I usually go to the high side to obtain the best MPG.
 

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Discussion Starter #12
I do not agree with those suggesting tire pressure on door plate. I use recommended pressure on tire. After all the tire is the thing holding the pressure not the car body. I usually go to the high side to obtain the best MPG.
I always heard that the max psi on the tire was for seating the bead when mounting the tire, not for normal use. 50 is the max on my tires but 35 is on the door, quite a difference, seems that the 50 would give you a rock hard ride. The door sticker psi is from the engineers for the specific vehicle to maximize ride and handling. My understanding was to never go over that value.
 

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Discussion Starter #14
I replied to your post do not know why it didn't show up?
It showed up on my email:
"You may be right? but think about this....I would think there is a standard for all rims built to conform to all tires manufactured in the USA? Therefore the tire is telling you what it can handle. That assumes the rim manufacturer not necessarily vehicle manufacturer complied with a national standard? if there is one. Also vehicle manufacturers select rim size based on the vehicle specs and performance. The tire manufacturer is making tires based on those sizes so one would think most should conform with a safety standard? My MKC had ride comfort options so it rides well enough with that 45 lbs in the tires."
 

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I always heard that the max psi on the tire was for seating the bead when mounting the tire, not for normal use. 50 is the max on my tires but 35 is on the door, quite a difference, seems that the 50 would give you a rock hard ride. The door sticker psi is from the engineers for the specific vehicle to maximize ride and handling. My understanding was to never go over that value.
Max on the tire may be 50 but there is traditionally another psi on the tire that is recommended to be filled to.
 

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I do not agree with those suggesting tire pressure on door plate. I use recommended pressure on tire. After all the tire is the thing holding the pressure not the car body. I usually go to the high side to obtain the best MPG.
:eek YIKES.....The vehicle determines the tire pressure as read on the inside of the door. The tire itself is RATED for higher pressure but it should be filled to the vehicle's plaque
 

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I have the 2019 MKC. Is there a way to calibrate what the instrument panel shows in pressure for each of the tires? I believe one of my tires shows pressure about 5 pounds too low.
 
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