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  1. 1st Gen 6T75 Transmission ('07-'12) will not shift above 1st intermittently

    Engine & Drivetrain
    2007 Acadia intermittently will not shift above 1st gear, sometimes weeks without issue (maybe 4 times in three months). When it occurs, park/restart fixes the issue. Codes P0700 “TCS malfunction lamp request, confirmed” and P0752 “Solenoid A stuck open, confirmed”). I’ve seen several posts...