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Ignition 0 voltage should be hot in ACC Run and Start. Check the fuse in the left fuse panel.
Both the "PCM ACC" and "IPC/BFC ACC" fuses receive Ignition 0 power. The second one powering your cluster.
If there's no power at those fuses then I'd say your ignition switch is probably the problem.
Also, P1671 isn't in the service manual.
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Cliff Scott
2004 Alero GX w/sport pkg - Sold, living somewhere in WI now.
2011 Saab 9-5 Turbo4 M6
2004 Corvette Convertible M6
1994 Chevy Beretta - Quad4/M5
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