Message Center display "Oil Level Low Add Oil" What sensor sends a message to ? on 2007 GMC Yukon XL Denali

Oil is full. Message was displayed before oil change. Immediatly after servicing the vehicle the same message returned.

Asked by for the 2007 GMC Yukon XL Denali
oil sensor could be bad. i would have it replaced because it will mess with the computer . also check to see if wire going to oil sensor is ok, could just be loose wire.
Thanks for your answer. I have unplugged the sensor and verified the wire and plug are in good shape. I will now change the sensor. I was wondering if there was another sensor that fed the message center. Thanks again.