Range rover sport stuck in low ratio Having engaged low ratio it will not disingage and remains the same This is on a 2005 NEW SHAPE, 2.7 Diesel, v6 auto

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Disconnect the ratio motor plug/socket on transfer box, apply 12v to the motor wires & it should motor back & forth from low to high. If it does, leave it in high, so at least you can drive it normally.
Plug it back in and remove the gearbox ECU from under the seat, check for damaged power transistors. Repair or replace.
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