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P0405 Diagnostic Trouble Code Discussion for January 2011

EGR Position Sensor Circuit Low Voltage

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Trouble Ticket Help Requests for DTC P0405
Help Request Posted
1998 Pontiac Grand Prix SE 3.1L MIL Lamp on VIN: 1G2WJ52M4W
P0405: EGR Sensor Circuit Low Voltage. ... vehicle to shop.With trouble code P0405 in memory. Was able to perform EGR testing thru scanner but no engine RPM change. Found the passage from EGR to the intake almost completly plugged off with carbon, cleaned it and retested. Now the RPMs drop and engi...
January 28, 2011