Well, I can answer your question now. I went for a ride yesterday. The day before I was riding and the TPMS showed normal pressure. A minute into yesterday's ride, I saw two big, red, flat tire icons on the dash (pic 1). While the dash was set for the TPMS, I could not change it while those icons were present. No matter where I moved the annoying little joystick, it stayed on the TPMS with the flat tire indicator. It did not tell me the pressure, just "rear tire pressure". When I checked the rear tire it had 17 lbs of pressure. I did the soapy water spray, but didn't need to as it was easy to find this giant nail (Pic 2 & 3). I pulled the nail, plugged the tire, and took it for a spin. TPMS read pressure correctly (Pic 4) and I could scroll through the screens normally. Lesson learned: either check your pressure EVERY RIDE, or get a TPMS (OEM or after market). That little sucker saved me from, at best, a dreadful day on the road.