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Old 09-05-2017, 02:47 PM   #1  
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Default Code 1639

Have changed the a/c sensor and the fuel pressure sensor, tested the voltage to the sensors and it is working and correct. What do I do now?
2001 Pontiac, Grand AM SE
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Old 09-06-2017, 10:11 PM   #2  
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Did you follow the trouble tree to the letter? If you did, you would know what the next step is.....
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Old 01-17-2018, 04:21 PM   #3  
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Did you follow the trouble tree to the letter? If you did, you would know what the next step is.....
On My 2002 firebird the service center at the dealer said the flow chart didnt make any sence for P1639 code
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Old 01-17-2018, 04:23 PM   #4  
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Have changed the a/c sensor and the fuel pressure sensor, tested the voltage to the sensors and it is working and correct. What do I do now?
2001 Pontiac, Grand AM SE
did you get the P1639 code fixed? the dealer did the same thing
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