HOW COME MY 2005 CHEYV UPLANDER WONT START WHEN THE P1819 CODE COMES UP

Question

what would be wrong with my 2005 chevy uplander how come it wont start all that comes up is the p1819 code

Answer 1

P1819 Internal Mode switch-No start / Wrong range

P0037 H02S Heater control circuit Bank 1 sensor 2

P1819 is the transmission range switch seeing the wrong gear .Check the transmission cable selector for any loose connection if none are found the problem will reside with the transmission range switch as for P0037 this is for the 02 sensor for the catalytic convertor . it is a good indication that the H20S  has degraded due to mileage and use.