Frankly it's just more trouble than it's going to be worth in the end. A code reader is $100 if you're worried about CEL codes. As for any other 'hidden' features...what are you hoping for? I can't think of many exciting possibilities that I could 'unlock' from the ECU. More lives? This isn't Contra.
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2013 Cadillac V-Wagon, RIP Z
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