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P2431 Diagnostic Trouble Code Discussion for March 2008

Secondary Air Injection System Pressure Sensor Performance

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Trouble Ticket Help Requests for DTC P2431
Help Request Posted
2006 Chevrolet Trailblazer LT 4.2L MIL Lamp on VIN: 1GNDT13S26
P2431: Secondary Air Injection System Pressure Sensor Performance. ... pump relay and now the pump and air solenoid are both working but the mil keep coming back on with p2431.air pressure sensor show on mod but i couldn't find it.anyone know where it is located and what is the common problem with this. thanks rick
March 17, 2008