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[muddypaws]

On the display it tells me at 40 PSI I have a tire problem. What is making it come on early? Just started today. Is there some sort of reset.

[fastfreddy]

I have to run mine 1 or 2 psi above 36/40, or I get light going off and on randomly

[grc]

On the display it tells me at 40 PSI I have a tire problem. What is making it come on early? Just started today. Is there some sort of reset.

I think there is more than one warning for the TPMS.  You get a warning for underinflation, but there is also a warning for system faults, low battery in a sensor, etc.  If you pull up the screen for the TPMS on the infotainment system, what does it actually say?  Btw, I've never been able to find a simple reset procedure not only for the Harley system but also for most automotive systems.  You might have to stop by a dealership and let them check it out with their scan tool.

Jerry

[Joel]

Inflation faults can be from a few lbs below or above predetermined specs.
Weak batteries can cause poor signals from the sensors and temperature plays a role also.
We can reset the pressure specs for some vehicles but I haven't had a bike to play with that has TPMS.
As Jerry said you should see the dealer as you may need the monitoring system updated.
But first I would use a couple different manual air pressure testers to see if any are close to the info from the bike.

[scotman623]

My Tpms came on today for low front tire, 34 psi, brought it up to 36 and it went out... They seem to be very finicky..

[grc]

My Tpms came on today for low front tire, 34 psi, brought it up to 36 and it went out... They seem to be very finicky..

Since the recommended MINIMUM air pressure cold is 36 psi, I think it's a great idea to have the TPMS warn you long before it gets down to what the federal law allows.  The statutory spec is 25% below the recommended pressure, or in this case 27 psi.  That is way too low and could be dangerous.  I personally believe it should be no more than 10% low when the warning is made, but the 5% low your bike warned you at is even better IMHO.

Jerry

[Twolanerider]

TPMS is still one of my half-way pet peeves.  Love the system for when it can advise of an ongoing deflation while traveling.  Unless it's a sudden flat (for which nothing will help) this gives me time to look for a place and deal with it.

I hate, however, these systems as a replacement for actually checking the tires.  It's when I check the tires that I lay a hand on them and feel for bulges or other problems, maybe see a cracked valve stem, or who knows what else.  If I'm only relying on TPMS (as the system over times allows us to do) I wouldn't do those things anymore.

None of my bikes are new enough to have the system internally.  The Garmin unit that can run on either the Road King or the Road Glide would monitor valve stem sensors though.  I suppose before a long trip it would be a consideration; just for the slow deflation warning that might be a benefit.  Though I'd have to change valve stems on the Road Glide.

I still like actually checking the tires though.  Not just the air pressure but the actual tires.  So, I'm old.

[muddypaws]

Just like magic the TPMS is working OK. 

[iski]

TPMS is still one of my half-way pet peeves.  Love the system for when it can advise of an ongoing deflation while traveling.  Unless it's a sudden flat (for which nothing will help) this gives me time to look for a place and deal with it.

I hate, however, these systems as a replacement for actually checking the tires.  It's when I check the tires that I lay a hand on them and feel for bulges or other problems, maybe see a cracked valve stem, or who knows what else.  If I'm only relying on TPMS (as the system over times allows us to do) I wouldn't do those things anymore.

None of my bikes are new enough to have the system internally.  The Garmin unit that can run on either the Road King or the Road Glide would monitor valve stem sensors though.  I suppose before a long trip it would be a consideration; just for the slow deflation warning that might be a benefit.  Though I'd have to change valve stems on the Road Glide.

I still like actually checking the tires though.  Not just the air pressure but the actual tires.  So, I'm old.

I still manually check the tires. No substitute for that.  TPMS is for peace of mind when you hit a patch of road & wonder - Are my tires low?

And yes, I am old.

[grc]

I've also editorialized on forums about the necessity to continue monitoring tires the "old fashioned way", but I usually come away feeling like I've just wasted a bunch of virtual ink.  Kind of like when I preach about the importance of only installing tires that meet or exceed the vehicle manufacturers load and speed ratings. 

IMHO old isn't necessarily bad.  In the "electronic gadgets for everything" era we are losing as much as we are gaining.  Many people no longer think they should learn the basics, why bother when you can google anything on your phone?  The difference is huge, but good luck trying to explain to young folks who have grown up with Google, YouTube, etc., that knowledge and the ability to work out solutions on your own is still very important.  I guess we'll have to wait for a massive EMP event to kill everyone's devices before they will understand.

Jerry

[muddypaws]

I manual test the tir pressure once a week when driving 700 miles or so. So far the TPMS has been right on.

[iski]

Mine averages about 1# over actual when cold.  Close enough to be beneficial.  Also use TPMS to know when the tires are heated up - on my bike 49-50 rear & 42-44 or so on front.