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Had 2 new LiftMasters 2.0 security garage door openers installed. I cannot program my 3 button universal remote to operate these openers. I called LiftMaster and they tried to help but it appears even with their Homelink 855LM repeater my truck remote system is not compatible. They suggested that my system is not a “Homelink” system and may be a Car2U system. I called local GMC dealer and gave them my VIN information but they could not determine if my system is actually a Car2U or Homelink system. Anyone esle have this problem? Does anyone have a solution? Anyone know what system is in my 2012 Sierra 1500 truck? Appreciate any help. thanks rick
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