[padgett]

Just a thought but I've seen mention that when certain error codes are set the trans will lock in one gear & 4th or 5th wouldn't surprise me.

"If a condition is detected that could

result in transmission damage, Transmission Limp Home
Mode is activated. In this mode, the transmission may​

operate only in certain gears, or may not shift at all." 2014 OM 3rd pg 366