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reg26

2015 R1200RT Low air pressure warning on dash

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reg26

Took a ride this afternoon and the low pressure warning came on for the rear tire. I turned around to come home and the pressure in the rear tire was 42 PSI and all of a sudden the warning light went out. Any Ideas as to what would have caused this?  I have had two rear flats in the past and the light came on giving me a great warning this time it was a false warning that went out after a short time 

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041100S

How cold was it when you left for the ride? Could be just a temperature related fall in the pressure until you had ridden far enough to warm it slightly to get the pressure up. 

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dirtrider
15 minutes ago, reg26 said:

Took a ride this afternoon and the low pressure warning came on for the rear tire. I turned around to come home and the pressure in the rear tire was 42 PSI and all of a sudden the warning light went out. Any Ideas as to what would have caused this?  I have had two rear flats in the past and the light came on giving me a great warning this time it was a false warning that went out after a short time 

Evening Reg26

 

Your tire pressure readings are temperature compensated so it either has to be REAL cold or your tire needs to be low.

 

See if the warning comes on again (might have just been  rouge signal interference) ,if it does come on again then swing by your BMW dealer & have them use their hand-held tire pressure sensor tester to wake-up your rear sensor & see what the battery output level is.   

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brown

Could be the battery going bad????

 

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Cap

With tongue only half in cheek, you could try changing the CR123 batteries in your theft alarm module. :lurk:

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reg26

I'm thinking the battery might be going bad. I rode the bike yesterday and all was fine. There is no way a drop in temperature could have caused this. I was a full on warning just like when you get a real flat. Then just went away after a few minutes 

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realshelby

I have had my tire warning light come on....first was in LA traffic and I was in a panic to get off to the side of the road. For no reason, it was fully inflated. Happened two other times. Cannot say it was ALL the battery, but it has not done that since changing the battery in the wheel unit. 

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AndyS

Yes, it happens on mine too.

I have given up on reliable readings from that system!

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Paul De

I have the same vintage Waterhead and still on the original TPMS modules in the wheels.  While I haven't had the low pressure warning you recieved I have gotten the dashed line no signal  from time to time this last year.  I wonder if as the batteries fades the lower voltage causes funky communication with the onboard receiver. Next tire change I'll update those modules.

 

 

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Paul De

Never did take the pressure reading as gospel, but to monitor a significant change while riding. So, if mine goes to throwing errant LP warnings, I will go old school on monitoring tires (good visual check every time I mount up) and switch to monitoring temperature until I replace the wheel modules.

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reg26

When I get new tires mounted I will have the battery's replaced. I do like the fact that the two times I did get real flats that the bike gave me a warning and I pulled of the road right away. I feel it's a good safety feature 

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alegerlotz

Was it "low pressure" or that the TPMS unit was not reporting any pressure at all?  I suspect it was the latter, and that's what one of my sensors started doing when it was on the way out.  I did this on and off for a couple of months before I got new tires and replaced that sensor.

 

I kept the old sensor so I can replace the battery (you can see how to do it on you tube) when the other sensor fails.  Since I have 3 of them now, I can rotate them as I replace batteries in the future.  I can then use my GS-911 to program the ones that are in the bike to the correct locations.

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realshelby

Many times ( and still do ) will get the "dashed line" meaning there is no signal. I pay no attention to that. 

 

The RED warning light comes on when it sends a signal of dangerously low tire pressure. I have seen that about 3 times so far, and each time tire was properly inflated. 

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reg26
57 minutes ago, alegerlotz said:

Was it "low pressure" or that the TPMS unit was not reporting any pressure at all?  I suspect it was the latter, and that's what one of my sensors started doing when it was on the way out.  I did this on and off for a couple of months before I got new tires and replaced that sensor.

 

I kept the old sensor so I can replace the battery (you can see how to do it on you tube) when the other sensor fails.  Since I have 3 of them now, I can rotate them as I replace batteries in the future.  I can then use my GS-911 to program the ones that are in the bike to the correct locations.

It was definitely a low pressure warning. Bright yellow triangle and red light on rear tire. I've had it twice before Like I said so I know what it means. Strange how it disappeared as I decided to ride home after pulling of the the side of the road. 

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reg26
17 minutes ago, realshelby said:

Many times ( and still do ) will get the "dashed line" meaning there is no signal. I pay no attention to that. 

 

The RED warning light comes on when it sends a signal of dangerously low tire pressure. I have seen that about 3 times so far, and each time tire was properly inflated. 

Well I guess this is my first time LOL. I will let you guys know after todays ride. Thanks for all the help!

 

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Skywagon

I’m still on original on my 14. Never a blip. It’s the screen I keep up on the dash all the time. It varies a little from my gauge due to temperature compensation. So far so good

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alegerlotz
2 hours ago, reg26 said:

It was definitely a low pressure warning. Bright yellow triangle and red light on rear tire. I've had it twice before Like I said so I know what it means. Strange how it disappeared as I decided to ride home after pulling of the the side of the road. 

 

That is the same warning I got when my TPMS sensor was failing.  The pressure shown was -- rather than a number.  

 

If the pressure is low, it should still show a number.  If its --, there is either no pressure at all in the tire, or the TPMS sensor is not being recieved.

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Cap
4 hours ago, reg26 said:

When I get new tires mounted I will have the battery's replaced. 

 

Most of us will buy a new TPMS unit, for which the batteries are not considered to be a user-replaceable item.  However, if you dig around on the forum, you will find a thread showing how to replace them yourself with some effort.  I am pretty sure that your tire dealer won't replace the batteries in your TPMS... and a non-BMW dealer will be unlikely to have the right TPMS part in stock for you.

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Paul De

Ugh! My 2015 RT rear TPMS just started to throw the same warning reg26 reported.  Previously I had experienced the double dash display.  It makes sense with both our bikes being 2015's the TPMS batteries would be going dead at about the same time.   Well, we are almost into Farkle season here so I will address then.  Not sure if I am going to try the batteryectomy on the OEM units, or find a suitable 3rd party replacement TPMS unit.

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