RepairPal Certified shops can diagnose and repair your 2003 GMC Envoy. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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Code P0105 indicates that the computer has detected an open or short in the MAP/BARO circuit. Could be due to a failed MAP sensor or a fault in the wiring or connectors.
Most likely it is a defective MAP sensor, but make sure that the wiring is not chafed, there is a TSB for the MAP sensor wiring rubbing on an engine bracket and then setting a MAP code.