I have a 2007 All american with a Cat engine . Driver went to move bus and it said range inhibited . Went into limp mode . Shut the bus off cleared things went to leave again range inhibited . So I brought the bus back in limp mode in 3rd gear . I was told I could retrieve the codes by pushing both arrows at the same time I did and it came up and said TL and then oL does this mean anything ? We are waiting on an allison program but would like to get the bus fixed now .The odometer has this TT in it .
Push the arrows a second time. If the transmission has the self oil level check on push of the arrows gets that. TL means the oil is too cold for the self check. One more push should get you into the trouble codes. It will show D-1 and the 4 digit code. Pushing the mode button will move to the next code if there is more than one.