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Got a 2005 GMC Envoy Denali 5.3L stalls @ idle in park after 10+minutes. Usually won't restart for 10 or 20 hours. After stall out has No spark & no injector pulse.
Already jumped the gun & replaced PCM. Same issue with old & new PCM.
Doesn't seem to be the ignition switch. But, since I am here , Obviously I'm only working on assumptions & brain farts.
This morning it started fine after a 15+hr walk away and Had no P codes.
Had ignition on , engine off for 20 minutes doing BCM scan / diagnostics. Was careful to not run engine till it stalled hoping to catch a snapshot.
Just having ign on while scanning created no start condition.
The 4 codes will set by just attempting to start after stalling.
If it happens to start I don't get the codes till it stalls .
Done wasted $500 ++ bucks on a wild goose chase.
I know this is going to be one of those simple fix deals "IF" I ever get to the "fix stage". lmao , if it was funny.
Seems to be a common issue on these series of GM units but so far all I can find is people like me looking for the Fix. Any advice is appreciated .

Vehicle: 2005 GMC Envoy Denali 5.3L

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P0443 Evaporative emission (EVAP) purge control circuit

P0689 Computer control system ignition relay feedback circuit low voltage

P1682 Ignition 1 switch circuit 2

P2176 Minumum throttle position not learned

All these code and sysmptom are related to one area one of the fixes for P0443 is to repair a open or short to ground in the ignition 1 voltage circuit. As for P0689 one of the repair is to test the ignition 1 circuit,and reapir  The hard start and all these code are from igntion 1 circuit. Use P1682 as the main cause for this condition.Where ignition 1 power the eletric throttle control(ETC) this is why you coded P2176.For now replace the Ignition 1 relay and replace the ECM 1 fuse.For your repair you will need to repair and look for high resistance at the ignition 1 relay  at the ECM. There is also a TSB for this condition this deal with the ECM and you where not suppose to replace the ECM with certain part numbers in other word there are faulty ECM  . TSB # 06-06-04-007 . The ECM 1 fuse may have the high resistance at its connection of the fuse

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