Question about 2003 Pontiac Grand Am

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A p1639 code on a 03 pontiac grand am - 2003 Pontiac Grand Am

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That code is the 5 volt reference circuit for the a/c pressure sensor and the fuel tank pressure sensor. Disconnect either sensor, one at a time and check for 5 volts at each end to see which end it is having the problem on. Sometimes you can reset the code and it will never come back on again.

Posted on Jan 10, 2010

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Posted on Jan 02, 2017

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