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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
Is there an aftermarket alarm on the vehicle?
If attempting to start or starting does not disable the alarm then its the security system thinking your a thief that has made unauthorized entry. You will need a locksmith to cut and program 2 new keys for you. Sometimes even getting fobs and only having a valet key will not even work. The system needs to see non valet programmed chipped keys to disable the alarm.
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Thanks for using Just Answer, Chris
Hello again Chris here,