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P1406 Diagnostic Trouble Code Discussion for February 2012

EGR Valve Pintle Position Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1406
Help Request Posted
1997 Pontiac Trans Sport 3.4L Misfire, MIL Lamp on VIN: 1GMDU06E9V
P1406: Egr. Hello Tech's. Vehicle comes in failing the Ca. Smog Test. A code for the EGR reveals a "chatter noise" when the EGR test is being used with the engine OFF, key ON. The desired and the actual PIDs do not match. With a NEW EGR plugged in, KOEO, you can s...
February 23, 2012