Po641 2007 Saturn

Question

How do I solve the the problem, what do I buy to fix the problem?

Answer 1

HI there

This code means the 5 volt reference voltage is incorrect. In most cases the ecm is the problem. You have to check the wiring as well, but since the reference voltage is produced by the ecm it's usually the problem.

P0641 SATURN - 5 Volt Reference Voltage Incorrect

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