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2006 Buick Rendezvous Question: what is po641 error code for above vehicle?



, 3.5L V6, Eustis, FL, October 14, 2013, 20:59

what is po641 error code for above vehicle?

2 Answers
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  • Answer #1

    G. T. Service Center (4246 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG October 14, 2013, 21:52

    It means you have a 5v reference circuit problem from the PCM. Ref cir #1 feeds the fuel tanK pressure sensor and the EGR. #2 feeds the MAP sensor and the a/c refrigerant pressure sensor. They send a 5v sig to each and the return voltage tells the computer how it is working or not working. See a tech to trace the circuit and repair it.

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  • Answer #2

    Greg's Orange Auto (15380 Answers) , Orange, CA - (714) 361-9386
    globalhelper October 15, 2013, 09:10

    agree with #1

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