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P0641 - Sensor Reference Voltage 'A' Circuit/Open

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Possible causes
- Faulty Engine Control Module (ECM)
- ECM harness is open or shorted
- ECM circuit poor electrical connection
- Shorted sensor on 5 volt circuit
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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
- Engine Light ON (or Service Engine Soon Warning Light)
P0641 Information for specific makes
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