i ran into a thread concerning the tire pressure monitoring system. and i read that the tpms could effect the esp. now im thinking it would because of the fact that the tpms probably calculates the revolutions of each tire and adjusts the engine and computer to adapt to whats really going on. for instance if 3 of the 4 tires has say 35 psi and the fourth has say15 psi theres no way the esp would act the same as if all 4 tires had the same pressure. for example im taking an exit of the highway at a high speed and lets say all the tires but the front right tire have the same psi and that front right tire is alot lower then the rest wouldnt the computer try to make that front right tire not grip as much due to the fact that, that tire will explode or something. i know the crossfire doesnt have all wheel drive like audi or even the same esp as audi. because i heard that in audi cars the engine sends power to the wheel thats slipping the most or isnt gripping the most. i hope im being clear as to what im trying to explain. ive had my tpms light come on for no reason i did change the front tires months ago but why would it come on now. so anyway i went to the dealer for an oil change and i pointed out that light to them at the time i didnt know what it was so 2 hours later they changed my oil and resetted tpms light and it came back on a day or 2 later. now i believe from my own experience with this car that the esp does get affected by the tpms. i can notice it almost as if the car doesnt want to take that "extra risk" on top of the risk its taking and correcting itself. upon needing to use the esp to get itself out o that corner this car is my first car that has esp and traction control and even a tpms. also now that im thinking about it the traction control might also be affected by this tpms sensor. i think the engineers at mercedes are smarter then we think and im sure they thought of everything and i mean everything like for every back-up theres a backup and so on.

 

The TPMS only monitors the tire pressure it has nothing to do with ESP or the traction control. It would only be common sense that if your driving on three good tires and one that's flat or close to being flat would cause the ESP or the TC react depending on the way your driving. Check the tire pressure when the tires are cold. I'd check it with a different tire guage also because some of them are not always accurate. If the light still comes on with the correct pressure then it might be a bad sensor or the monitor.

 

I forgot to mention that it doesn't take much for the traction control to kick in and cut the engine power when it loses traction in the Crossfire especially with summer tires now that it's getting colder.

 

I can attest to both points.

I had a non-sending TPMS unit replaced a week ago. Warranty

If you have TC/ESP control ON, it is almost impossible to lose it around a corner. This car won't let you fishtail.

 

lol... I just fish tailed yesterday coming out of a corner from the University. It was not a bad fish tail though... I did not realize I was even fish tailing until I hit the gas and I was not feeling anything. Then I realized I my rear was going sideways so I let off the gas and turned the car straight and it was fine. So, you MIGHT fish tail, but it will not let you go out of control.

 

That's kinda' what I meant.

 

A couple weeks ago the temps went below the 50's. Both vehicles with tire pressure sending units alerted that the tires were in need of air. I put air in the tires and checked pressure to match the specification. No more warning lights. If it keeps reporting, it's either a slow leak or a bad sensor. They have batteries in them that don't last forever.

ESP will take into account the differences in tires and tire pressure but is acting apart from the pressure sensor - it's just detecting the condition in a different way. If the pressure sensor is malfunctioning, the ESP probably would not operate any different from normal (assuming the tire in question is properly inflated).

 

It's really common for your TPMS light to come on the first really cold day of the season. Mine do it on an annual basis. Usually driving for a few minutes warms the tires up and brings the pressure back up.

 

Mine started doing just that, going off after the tires warmed up. Now the light stays on all of the time. Checked pressures, all ok. Looks like one of the batteries might have gone on me.
Oh boy! Warranty time.
On second thought I'll just deal with it until a more serious warranty issue arises.

 

FYI - Warning light with temp change. the past few years, especially in the fall I've had the light come on when the temp dropped. Last spring when I got my new wheels put on I had them filled with Nitrogen instead of air. Well the temp dropped significantly this week and no warning light. Nitrogen does stabilize your tire pressure.
Pat

 

I have nitrogen in mine too and when the temperature dropped this fall the tps light came on. The tires had not been checked and they should have had some nitrogen in them before, the drop in temp just reduced the volume enough to put the light on. Air and nitrogen both decrease in volume as the temp. drops.

The low air volume in these tires compared to standard profile tires means that the loss of 'x' amount of air/nitrogen in our tires is a greater percentage of the original volume than losing the same amount in a regular size tire. Less volume is less pressure, this means the pressure drops considerably with this relatively small loss of volume. By the same token adding 'x' amount of air to the tires leads to over inflation sooner.

Saying that the light goes out after driving for a few miles means they are under inflated period. These lights go on when, in my experience, they lose about 6-8 psi, so driving them until they add 2 psi may make the light go out but they are still lacking air.

I had a slow puncture last year, I did not see the light, it is hidden behind my hand when driving, I came out of the house the next day and saw the light when I started the engine. Bugger the tire was ruined because of the side wall damage. Not cheap, no damage to the rim though as it went flat overnight.

 

Mine did the same thing when I kept the tires around 33PSI.

Changing to 35PSI fixed the cold weather TPMS light.