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I've been dealing with same intermittent issues between no throttle response and security lockouts, my tuner plugged in with his v2 and the vin# has been popping up in Greek writing, unplugged stereo and vin# popped up but no serial#.. Says ecm locked when there was no lock put on when tuned,, I'm also thinking ecm is shot but really unsure at this point.. Please repost if ecm is replaced and fixed your problem..
 
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