Mine has done the same thing on two different occasions. idk what happened the first time but it fixed itself after a few startups,that was 2 yrs ago. The second time a couple of weeks ago it did it again and i discovered there was 3 inches of water in the sparetire well. Your ride height sensor might be confused, idk where that is located but i do know the Air tank and what looks like a Modulator is under the spare tire and foam blocks in the trunk. You might try unplugging it fir a minute