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P1406 Diagnostic Trouble Code Discussion for May 2006

EGR Valve Pintle Position Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1406
Help Request Posted
1996 Chevrolet C1500 Cheyenne 5.0L MIL Lamp on VIN: 1GCEC19MXT
P1406: EGR Valve Pintle Position Circuit Malfunction. ... failed an OBDII emission test. The P1406A Code sets consistently. Like an EEC IV Ford, the EGR position sensor reports open at idle. The EGR Valve has been replaced to no effect. Key on engine off we show .88 volt (both directly and through the scan tool...
May 16, 2006
1995 Chevrolet Blazer 4.3L Poor Idle Quality, MIL Lamp on VIN: 1GNDT13W6S
P1406: egr pintle position. This vehicle is not firing on 1,3, and 5 cylinders at idle, I can pull those wires off and absolutely no difference. I put a cap and rotor on it just to be sure (got burned once by not doing it) and ran the same. Plugs for those cylinders indicate rich. Vacuum...
May 30, 2006