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Do you have a code number? otherwise more commonly found when you have just reverse is a cracked cage in the transmission,the good thing is it is a cheap fix.
02 I6 doesn't have one. I believe 06+ have them, but not the older ones. My 06 does have one, located right after the throttle body towards the air box.
if their is a check engine light have the code read ------no such thing as lock down mode you have limp mode which will let you limp vehicle home or to a shop or off road safely sounds like a transmission problem check fluid --look and smell if it looks burnt brownish and or smells burnt try a flush with a fluid and filter change may gey lucky ---look under vehicle and check the selector cable and connections sometimes disconnect or rot away lastely possible internal problem which would need a transmission specialist to look at
Total capacity for most Yukon transmissions with the Vortec engines is between 14.4 to 20.7 quarts depending on whether you have front or front and rear AC, and oil cooler for your transmission.
Start with the 14.4 quarts and add more as needed.
Start by ensuring fluid level for transmission is correct. Is the check engine light on? If so, the transmission control module may have code stored in it to point you in the right direction. You can also try disconnectint/reconnecting battery which will reset transmission module.If problem corrects itself,keep driving to see if it reoccurs. If problem occurs immediately, recommend transmission diagnostics b efore costly repairs develop
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