Jeep Wrangler Forum banner
  • Hey everyone! Enter your ride HERE to be a part of JUNE's Ride of the Month Challenge!
1 - 6 of 6 Posts

·
Premium Member
Joined
·
365 Posts
Discussion Starter · #1 ·
One of the first things that I did, after buying my 2015 JKUR back in January, was to reduce the tire pressure based on the advice here. I used OBD Jscan to reset the alarm threshold to 26 pounds and all was good until this weekend. Now, I am getting the TPMS warning light, and the error message to "inflate to 37 psi".


I went back and checked and the limits are still at 26 pounds, and all four sensors are showing the correct amount of pressure (32 psi), which is above the limit, so I am not sure why I am getting the light.



I tried using OBD JScan to clear the TPMS code and it seems to persist.


Any ideas? Thanks!
 

·
Premium Member
Joined
·
7,538 Posts
Are the tires still stock size? What psi does it say on the door jamb sticker to inflate them? Mine is a 2013 and it specifies 35 psi all around, which is what I keep them at. I had to fire up the air compressor earlier today because of the cold weather, which causes the tire pressure to go down.
 

·
Registered
Joined
·
133 Posts
Yup cold air makes low tire pressure. Lots of people to our shop with their light on. Also sensors themselves aren’t 100% accurate regardless what you tell the pcm
 

·
Premium Member
Joined
·
365 Posts
Discussion Starter · #4 ·
Thanks guys.



35" tires.



I thought it might be the cold snap, but the sensors are giving me accurate numbers (as in the pressure the tires are actually set to), which is well above the limits set by OBD JScan. That is why I am confused. This has been fine since February, and now something has changed.
 

·
Premium Member
Joined
·
663 Posts
I think JScan might have a problem. When I got 35s with new TPMS sensors it took a little while to connect, but they finally did. Like 2 weeks later I'm getting low tire pressure alert despite me changing my threshold like you did. Kinda pissed I spent money on new TPMS sensors for new wheels and tires while I drive around with low tire pressure light on. Haven't gotten around to tinkering with it, or if I'm just going to turn it off - if that even works. It took a number of tries on Jscan to reset when I regeared, which was real fun trying to get my jeep home jumping into limp mode until it finally took... not happy with Jscan other than the price.
 

·
Premium Member
Joined
·
365 Posts
Discussion Starter · #6 ·
@JeepJeepBeepBeep - I wondered about that. I may try to contact the OBD Jscan developer to hear his thoughts. From my reading here, he does seem to respond quickly. Good idea, thanks.
 
1 - 6 of 6 Posts
Top