P1682 is low voltage at the ignition switch. 2 things, our ignition switches are prone to go out in Trailblazers and Envoys, so I'd look to replace this first. The only other problem would be wiring harness that leads to the ignition, check for shorts. My bet is the switch, it's not the switch the key goes into, it's under the column cover on the bottom, a little black module. Very easy to take it out and replace yourself and will run you around $35.
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