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you have to sart the engine and let it warm up..
turn off engine but leave key in the run position.
flip the switch to on ..on the ecm
at ecm the lights will flash 1 time then 2 times then three times then four and then 5 times..
these are modes..
you need the 3 rd mode
so just after the lights flash three times turn the switch off and then record the codes...
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