TPMS defective?
Thread Starter
Member
Joined: Dec 2008
Posts: 191
Likes: 17
From: Rose Creek Golf Club, Edmond, OK
2023 E450W, 2020 GLC300
TPMS defective?
On my 2012 E350, the yellow tire pressure warning light (resemble the cross-section of a tire) comes on every few days. I have reset it several times, and have checked that the tires pressures are correct as specified on the fuel filler door. The warning light came on again yesterday, and when I checked the pressures via the TPMS, it showed 29-29-33-34.
Is this system that finicky, or is there a defect?
Is this system that finicky, or is there a defect?
Member
Joined: Feb 2011
Posts: 151
Likes: 2
From: Indiana
2016 GL63 AMG, 2012 E550 4 matic
Maybe this will help Post #13 was the solution.
https://mbworld.org/forums/e-class-w...ure-range.html
https://mbworld.org/forums/e-class-w...ure-range.html
Member
Joined: Sep 2012
Posts: 204
Likes: 6
From: England
Mercedes E350 CD Iridium silver convertible 2010
On my 2012 E350, the yellow tire pressure warning light (resemble the cross-section of a tire) comes on every few days. I have reset it several times, and have checked that the tires pressures are correct as specified on the fuel filler door. The warning light came on again yesterday, and when I checked the pressures via the TPMS, it showed 29-29-33-34.
Is this system that finicky, or is there a defect?
Is this system that finicky, or is there a defect?
Thread Starter
Member
Joined: Dec 2008
Posts: 191
Likes: 17
From: Rose Creek Golf Club, Edmond, OK
2023 E450W, 2020 GLC300
Oops, my bad. I misstated the tire pressures in my initial post. The pressures in the tires are front 35, rear 36, as specified on the fuel filler door for normal load. The wheels and tires are factory original 17" with about 8,000 miles on them. The car is US "Luxury" model. With those pressures, the tire pressure warning light keeps coming on...
Last edited by BobbyT; Nov 21, 2012 at 08:58 PM.
MBWorld Fanatic!
Joined: Dec 2011
Posts: 4,362
Likes: 936
W212 FL
Oops, my bad. I misstated the tire pressures in my initial post. The pressures in the tires are front 35, rear 36, as specified on the fuel filler door for normal load. The wheels and tires are factory original 17" with about 8,000 miles on them. The car is US "Luxury" model. With those pressures, the tire pressure warning light keeps coming on...
Lower all the pressures and set them at 30 psi . Reset the TPMS according to that pressure and then after it's all set again inflate the pressures up to desired value . Mine works well and no more warning light comes on.
I can confirm that tpms works efficiently , I have seen twice these warning on my cluster and each time there was a problem with the tire (1st pressure loss due to stud , 2nd curbed the pavement lol )
Why I run my pressure higher than register ? Because of eliminating possibility of false readings from various reasons .
MBWorld Fanatic!
Joined: Jul 2007
Posts: 1,904
Likes: 29
S350 BT 4MATIC
Hey try this :
Lower all the pressures and set them at 30 psi . Reset the TPMS according to that pressure and then after it's all set again inflate the pressures up to desired value . Mine works well and no more warning light comes on.
I can confirm that tpms works efficiently , I have seen twice these warning on my cluster and each time there was a problem with the tire (1st pressure loss due to stud , 2nd curbed the pavement lol )
Why I run my pressure higher than register ? Because of eliminating possibility of false readings from various reasons .
Lower all the pressures and set them at 30 psi . Reset the TPMS according to that pressure and then after it's all set again inflate the pressures up to desired value . Mine works well and no more warning light comes on.
I can confirm that tpms works efficiently , I have seen twice these warning on my cluster and each time there was a problem with the tire (1st pressure loss due to stud , 2nd curbed the pavement lol )
Why I run my pressure higher than register ? Because of eliminating possibility of false readings from various reasons .
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Member
Joined: Jan 2009
Posts: 178
Likes: 0
From: Westchester County, NY
'11 E550 4MATIC, '07 Suzuki SV1000S
TPMS Issue
My TPMS seem to be reading 4-5 psi high compared to my accupressure digitial tire gauge...not sure what that's about, but I'm not quite sure what the fix is either.
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Super Member
Joined: Jun 2011
Posts: 576
Likes: 8
From: Placitas, NM
E550
I set my tires, cold, with a quality tire gauge. Then I reset the TPMS. I don't care what pressure the TPMS shows (within reason) because I know what the real pressure is.
I don't get false warnings, but if an incident happens --- a nail, or when cold weather hits --- I'll get a proper warning --- fix the flat, or crank up the air for winter weather.
Thread Starter
Member
Joined: Dec 2008
Posts: 191
Likes: 17
From: Rose Creek Golf Club, Edmond, OK
2023 E450W, 2020 GLC300
Okay, I now have a decent tire gauge (Joe's Racing 32307) so I can set the tire pressure more precisely. I set the tire pressures cold at F35, R36, and reset the TPMS. I will report back when/if the warning light goes off again, and the pressures shown. The car is due for its first service next month, so I plan to collect some good data before then.
Super Member
Joined: Jun 2011
Posts: 576
Likes: 8
From: Placitas, NM
E550
>>>>>>>. "I now have a decent tire gauge (Joe's Racing 32307)" <<<<<<<<<
That's a great gauge. I've tested it against others, and find it equal to the most expensive. Well made, the rubber cladding makes it tough, it has a great dial, a good valve interface, and it's absolutely consistent, which is the most important thing.
That's a great gauge. I've tested it against others, and find it equal to the most expensive. Well made, the rubber cladding makes it tough, it has a great dial, a good valve interface, and it's absolutely consistent, which is the most important thing.
Thread Starter
Member
Joined: Dec 2008
Posts: 191
Likes: 17
From: Rose Creek Golf Club, Edmond, OK
2023 E450W, 2020 GLC300
Thanks, Live Oak, for the information on the tire pressure gauge. The TPMS shows two psi lower than the gauge, so it is good to know that the gauge may be more accurate.
