start with cleaning EVERY connection in the battery area ,can't send a picture but look at the connector to the batteries and trans (usually just laying on top of the batteries ,wiggle and pull on them- mine came apart in my hand ,check ground.
i had the same message -SM,thought it meant 'select manual' drove it home from alberta no harm done.
again electrical connections must be pristine ,my freedom line 'guy' instructs fleet mechanics "clean every connection every year"