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P0641

P0641 - Sensor Reference Voltage 'A' Circuit/Open

Possible causes
- Faulty Engine Control Module (ECM)
- ECM harness is open or shorted
- ECM circuit poor electrical connection
- Shorted sensor on 5 volt circuit
What does this mean? What does this mean?
When is the code detected?
The Engine Control Module (ECM) has detected the sensor 5 volt reference circuit voltage is higher or lower than expected
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
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