Pontiac Firebird P Codes (Powertrain) P1600 - P1699 P1639

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GM Dtc Code P1639

2002 PONTIAC FIREBIRD
I Got A Check Engine Light On, Gm Code P1639 Five Volts Fer, Circuit 2. The Dealer Changed The Ac Pressure Sensor. The Light Came Back On...
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Asked by Billy Miller

Obd Ll Code P1639

2002 PONTIAC FIREBIRD
Where Would I Check "5 Volt Ref Circuit 2 "? I Do Not Know What That Means.
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Asked by billmill5050

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