Sunday, May 1st, 2011 AT 5:07 PM
03 GMC Envoy, disconnected battery, removed altenator to access thermostat. Replaced thermostat and reinstalled altenator. First I received unknow driver message and no start; then Envoy starts but won't shift out of park and has both the SES and Reduced Engine Power light. In addition to the lights, the transmission will not shift out of park.