Low tire pressure warning
Thread Starter
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Road Master
Joined: Feb 2023
Posts: 965
Likes: 848
From: Hudson, CO
Low tire pressure warning
Strange thing happened this evening while out in a ride. The low tire pressure warning came on. So I pulled over at a gas station to check it out. Now, that wouldn't be strange if I had a low tire. Both were perfectly normal warm tire pressures. The bike was saying the rear was low, but it also said it was at 44 psi. I got out my little pump that plugs into the power port by the left side cover and hooked it all up. the gauge on the pump agreed that tire was at about 44 psi. I added a pound or so to replace the slight loss from hooking it up and removing the pump. Restarted the bike and got the same low pressure message. I watched the rear tire reading while riding home and it fluctuated between 43 and 45 depending on how fast I was going so I believe the sensor is communicating.
When I got home I got out the owners and service manuals. Neither has any info on how to adjust the warning PSI range, so I'm not sure it's possible. I'm a bit stumped.
I guess I'm going to have to schedule a visit to service department. The bike is still under warranty so they should fix whatever it is for free, just a hassle.
When I got home I got out the owners and service manuals. Neither has any info on how to adjust the warning PSI range, so I'm not sure it's possible. I'm a bit stumped.
I guess I'm going to have to schedule a visit to service department. The bike is still under warranty so they should fix whatever it is for free, just a hassle.
Seasoned HDF Member
Joined: Jun 2014
Posts: 5,474
Likes: 6,345
From: pacific northwest
I get that every once in a while, the tire pressure warning light comes on and the reading on the screen will show just show -- and the other will read normal and does it with both front and rear.
Have just learned to live with it.
Have just learned to live with it.
Thread Starter
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Road Master
Joined: Feb 2023
Posts: 965
Likes: 848
From: Hudson, CO
I didn't get a "--" reading. I had normal readings, but an annoying warning on the screen and the little yellow tire pressure light was on in the right gauge. Maybe it will correct itself???
Cruiser
Joined: Apr 2016
Posts: 173
Likes: 7
From: Belle Fourche, SD
Tire pressure
Had the same thing. Researching I found it is common on the newee bikes. The sensor for the light is based on not only the tire pressure, but outside temp. The manual has a chart indicating how much to add based on outside temp. For example if 88 to 98 degrees outside need to increase 7 psi. Over 98 add 8 psi. The chart also has the difference if tire hot or cold from riding. Check that out. If you are close and it is still on, let some air out, like 5 psi then air to spec. I believe the sensor needs a 3 or more change to reset.
Seasoned HDF Member
Joined: Jun 2014
Posts: 5,474
Likes: 6,345
From: pacific northwest
I had the RGL checked at the dealer while still on warranty, they could not come up with anything. It will stay on for maybe a minute then go back to normal. As I mentioned it is very sporadic and sometimes will go a couple thousand miles without alarming.
Last edited by MRFREEZE57; Jul 16, 2024 at 09:59 PM.
Road Warrior
Joined: Dec 2005
Posts: 1,276
Likes: 1,077
From: SE SC
Here's a hack I picked up, to get rid of the TPMS warning that comes on.....even though the tires are manually checked to "normal" pressure
1. With tires cold, over-inflate the tires by 5-7 pounds.
2. Deflate the tires to 5-7 pounds UNDER the recommended pressure
3. Reinflate the tires to the correct pressure.
I get the TPMS warning about once every few months, and even more frequently when the outside air temp changes. This "technique". trick-f*cks the TPMS.....I think it's actually like a re-boot of the TPMS sensor.
Try it and see if it works. If it doesn't then take a trip to the dealer.
1. With tires cold, over-inflate the tires by 5-7 pounds.
2. Deflate the tires to 5-7 pounds UNDER the recommended pressure
3. Reinflate the tires to the correct pressure.
I get the TPMS warning about once every few months, and even more frequently when the outside air temp changes. This "technique". trick-f*cks the TPMS.....I think it's actually like a re-boot of the TPMS sensor.
Try it and see if it works. If it doesn't then take a trip to the dealer.
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Seasoned HDF Member
Joined: Jan 2005
Posts: 5,859
Likes: 2,507
From: Lake Orion, MI
This happened to me once -and I actually found a way to resolve the matter.
I was out riding one day and checked my air - seemed it was about 2 lbs low (no light). So, I added a little. Once I did, I got the light. So, I added the two lbs - light did not go off. Road the bike home, about 60 miles or so.
Got home - tried to take air out and put air in - checked the air with the bike and the gauge - both show I was right on target. Did the hack listed above - light did not go out (pressure registered right on target).
Then, I decided to check to see if I had any codes - sure as heck, there was one. Cleared the code (remember, you have to ride the bike for a 1/2 mile or so after doing this), light went off and I have never again had this issue.
Good luck.
I was out riding one day and checked my air - seemed it was about 2 lbs low (no light). So, I added a little. Once I did, I got the light. So, I added the two lbs - light did not go off. Road the bike home, about 60 miles or so.
Got home - tried to take air out and put air in - checked the air with the bike and the gauge - both show I was right on target. Did the hack listed above - light did not go out (pressure registered right on target).
Then, I decided to check to see if I had any codes - sure as heck, there was one. Cleared the code (remember, you have to ride the bike for a 1/2 mile or so after doing this), light went off and I have never again had this issue.
Good luck.
Last edited by cycle7447; Jul 17, 2024 at 05:47 AM.
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Road Master
Joined: Jun 2013
Posts: 1,058
Likes: 953
From: Sarasota Florida
The Harley TPMS is known to be inaccurate. My 23 Road King is off by 3-4 lbs between my gauge and what the TPMS says.
This is an issue that Harley has known about for a while but doesn't seem to want to do anything to inform riders or fix the problem.
This is an issue that Harley has known about for a while but doesn't seem to want to do anything to inform riders or fix the problem.
