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- - Code 1639 (https://www.gmforum.com/general-gm-chat-88/code-1639-a-311247/)

Sunshine!

09-05-2017 02:47 PM

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

Tech II

09-06-2017 10:11 PM

Did you follow the trouble tree to the letter? If you did, you would know what the next step is.....

billmill5050

01-17-2018 04:21 PM

Quote:

Originally Posted by Tech II (Post 1623837)

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

billmill5050

01-17-2018 04:23 PM

Quote:

Originally Posted by Sunshine! (Post 1623830)

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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