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My Yukon was stolen and then abandoned because it quit running.  The problem was lack of fuel.  Changed pump. No good.  Checked voltage to pump.  Changed computer.  Would not start.  I had dropped tank and disconnected pump to check voltage.  When I checked codes I got a P0452 and a U1000.  This was with the pump lead disconnected.  I see the P0452 because the pump is disconnected.  Would this throw a U1000.
Vehicle: 2001 GMC Yukon 5.3

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