what is po641 error code for above vehicle?
Buick Q&AAsk Your Question
2006 Buick Rendezvous Question: what is po641 error code for above vehicle?
Answer #1ProfessorG from G. T. Service Center, October 14, 2013, 18:52Master
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.
Answer #2Greg's Orange Auto (10929 Answers) , Orange, CA - (714) 482-6185globalhelper October 15, 2013, 06:10Master
agree with #1