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P0641 - Sensor Reference Voltage 'A' Circuit/Open

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P0641 Comments |  Add Comment
Possible causes
- Faulty Engine Control Module (ECM)
- ECM harness is open or shorted
- ECM circuit poor electrical connection
- Shorted sensor on 5 volt circuit
Help with this
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)
Need more help?
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