R6 code for what I have found means the lift Test failed. The lift card has 3 wires on it 1,2,3. Pos on one neg on 3 should read 11vdc give or take. Pos on 2 needs to be 7.2 or higher at start up and rest. Once this passes it will pulse the voltage down and read current. If current is read the truck passes. Do not use aftermarket lift card and change both card and transistor.
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