did someone turn it off? here's what the owners manual says. Not sure if you can decrease the value enough to turn it off or not, but just maybe that's what happened

OIL LIFE
This displays the remaining oil life.
An oil change is required whenever indicated by the message center and
according to the recommended maintenance schedule. USE ONLY
RECOMMENDED ENGINE OILS.
To reset the oil monitoring system to 100% after each oil change
(approximately 7,500 miles [12,000 km] or 12 months) perform the
following:
1. Press and release the SELECT/RESET stem to display “OIL LIFE
XXX% HOLD RESET = NEW”.
2. Press and hold the SELECT/RESET stem for two seconds and release
to reset the oil life to 100%.
Note: To change oil life 100% miles value from 7,500 miles (12,000 km)
or 12 months to another value, proceed to Step 3.
3. Once “OIL LIFE SET TO XXX%” is displayed, release and press the
SELECT/RESET stem to change the Oil Life Start Value. Each release
and press will reduce the value by 10%.