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The disable switch for the AFM is that pedal under your right foot. I have AFM on my Suburban and the readout on the info center. The only time it is in V4 mode is with absolutely no/zero load on it. If it does manage to go into V4 mode as soon as I put any pressure on the gas pedal it immediately switches to V8.
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2010 Yellow 2SS/RS, L99 Auto, Grey Leather, Polished 20's
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