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Re: 6.0 runs but no power
You would have more codes than P0300 if it was in limp mode. It would also run good and have decent power at 20 mph+. Limp mode is 2nd and 3rd on the 4L60E/4L65E/4L70E. You have a 4L70E in that hummer btw. It’s essentially a little more heavy duty 4L60E
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