Strange TPMS incident
Thread Starter
Racer
Joined: Nov 2019
Posts: 370
Likes: 62
From: Northern Arizona
Strange TPMS incident
Starting up the '19 Macan base, all tires show up as -6 PSI and dire warnings about driving it appear on the screen. I get out of the car to take a look, thinking maybe someone vandalized the tires. However, the tires look fine, and a manual tire gauge shows at least one to be close to normal. I decided to drive anyway, and after a few miles, everything reset itself and the pressures all appeared normal, around 35 PSI or so.
Has anyone else experienced such an odd event? This was several weeks ago and has fortunately not repeated itself.
Has anyone else experienced such an odd event? This was several weeks ago and has fortunately not repeated itself.
Three Wheelin'
Joined: Feb 2007
Posts: 1,510
Likes: 287
From: Colorado/California
Starting up the '19 Macan base, all tires show up as -6 PSI and dire warnings about driving it appear on the screen. I get out of the car to take a look, thinking maybe someone vandalized the tires. However, the tires look fine, and a manual tire gauge shows at least one to be close to normal. I decided to drive anyway, and after a few miles, everything reset itself and the pressures all appeared normal, around 35 PSI or so.
Has anyone else experienced such an odd event? This was several weeks ago and has fortunately not repeated itself.
Has anyone else experienced such an odd event? This was several weeks ago and has fortunately not repeated itself.
Rennlist Member
Joined: May 2001
Posts: 16,124
Likes: 1,162
From: Eagle ID
Had this on the 997.1TT
If the Porsche recommended is say, 39/44, and you have 6 psi or more below that, it reads -6 until you inflate to their recommended. Then drive around some to reset it. Then let air out to your preferred.
If the Porsche recommended is say, 39/44, and you have 6 psi or more below that, it reads -6 until you inflate to their recommended. Then drive around some to reset it. Then let air out to your preferred.
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Thread Starter
Racer
Joined: Nov 2019
Posts: 370
Likes: 62
From: Northern Arizona
Most interesting -- will have to try that. However, it doesn't explain how it went away on its own and a week later, has not returned even though I neither messed around with the tires' air nor with any settings on the dash.
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Instructor
Joined: Jan 2017
Posts: 190
Likes: 41
Funny, exactly the same happened to me! One tire down on pressure and cue the bings and bongs. After a couple of miles, tire warms up and clearly the pressure is in tolerance again. A week later, same tire again, same issue and same resolution. Down 6 psi but the most recent incident it showed down 4. Anyway, my wife is driving the car at the moment so she popped into the local tire place to get it checked on a verified air pump. Yup, all tires down a little and one tire slightly more. Fixed and all good.
I suspect that Porsche TPMS systems are a little more sensitive than others and like to complain more. I struggled in the transition from summer to fall to winter in my previous Cayenne and keeping tire pressures. Needed constant adjustment to get them right as the weather cooled. Northern California resident and during this time we can get pretty big swings in temperatures - late 70's to low 50's being pretty common - not a massive difference, but I suspect its just enough to mess with the TPMS and trigger a warning or two.
I suspect that Porsche TPMS systems are a little more sensitive than others and like to complain more. I struggled in the transition from summer to fall to winter in my previous Cayenne and keeping tire pressures. Needed constant adjustment to get them right as the weather cooled. Northern California resident and during this time we can get pretty big swings in temperatures - late 70's to low 50's being pretty common - not a massive difference, but I suspect its just enough to mess with the TPMS and trigger a warning or two.
Thread Starter
Racer
Joined: Nov 2019
Posts: 370
Likes: 62
From: Northern Arizona
Funny, exactly the same happened to me! One tire down on pressure and cue the bings and bongs. After a couple of miles, tire warms up and clearly the pressure is in tolerance again. A week later, same tire again, same issue and same resolution. Down 6 psi but the most recent incident it showed down 4. Anyway, my wife is driving the car at the moment so she popped into the local tire place to get it checked on a verified air pump. Yup, all tires down a little and one tire slightly more. Fixed and all good.
I suspect that Porsche TPMS systems are a little more sensitive than others and like to complain more. I struggled in the transition from summer to fall to winter in my previous Cayenne and keeping tire pressures. Needed constant adjustment to get them right as the weather cooled. Northern California resident and during this time we can get pretty big swings in temperatures - late 70's to low 50's being pretty common - not a massive difference, but I suspect its just enough to mess with the TPMS and trigger a warning or two.
I suspect that Porsche TPMS systems are a little more sensitive than others and like to complain more. I struggled in the transition from summer to fall to winter in my previous Cayenne and keeping tire pressures. Needed constant adjustment to get them right as the weather cooled. Northern California resident and during this time we can get pretty big swings in temperatures - late 70's to low 50's being pretty common - not a massive difference, but I suspect its just enough to mess with the TPMS and trigger a warning or two.
Race Car
Joined: Jun 2012
Posts: 3,628
Likes: 346
From: Maryland USA
Happened to me yesterday. Temps in 50s for first time this autumn. One front low according to TPMS. Checked w tire gauge, same both sides, Drove for 15 mins, no more warning. Added 3 all around; no warning.
Intermediate
Joined: Nov 2020
Posts: 38
Likes: 20
From: Medford, NJ
The same thing has happened to me twice, once in July when it was hot and again yesterday in the fifties. Both times it was the left rear tire and the pressure was 37 psi. The warning said -6. I increased pressure to 41 psi and the warning cleared and then I reduced the pressure back to where it was. I thought I had a fickle TPMS sensor on that wheel. After reading this thread I realize the phenomenon is not uncommon. That said, I think it is inexplicable and illogical and still think it might be a faulty sensor
