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P2066 Diagnostic Trouble Code Discussion for April 2008

Fuel Level Sensor 2 Performance

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Trouble Ticket Help Requests for DTC P2066
Help Request Posted
2003 GMC Sierra 3500 6.6L Check engine light VIN: 1GDJC34163
P2066: Secondary Fuel Sensor Signal Performance. Vehicle came in with a return code P2066- fuel level sensor secondary problem. Checked fuel level sensor Ohms wise, 40 Empty, 250 Full. Does anyone know what tells the ECM to fire or power up the auxillary tank fuel pump to transfer fuel from rear tank to fr...
April 08, 2008