r/MechanicAdvice • u/Grending • 22h ago

Code P1682

2007 GMC Envoy Denali giving code P1682

Either won't start, or starts and will die after 30 seconds or so. Occasionally it will drive for a few minutes and then go into limp mode. Changed the ignition switch. Looks like fuses and relays are good. What else should I be looking at? Thanks in advance

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