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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
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0641 Information for specific makes
P0641 ACURA Sensor Reference Voltage 'A' Malfunction
P0641 BUICK 5 Volt Reference Voltage Incorrect
P0641 CADILLAC 5 Volt Reference Voltage Incorrect
P0641 CHEVROLET 5 Volt Reference Voltage Incorrect
P0641 GMC 5 Volt Reference Voltage Incorrect
P0641 HONDA Sensor Reference Voltage 'A' Malfunction
P0641 HYUNDAI Sensor Reference Voltage 'A' Circuit Open
P0641 ISUZU 5 Volt Reference Voltage Incorrect
P0641 KIA Sensor Reference Voltage 'A' Circuit Open
P0641 PONTIAC 5 Volt Reference Voltage Incorrect
P0641 SAAB 5 Volt Reference Voltage Incorrect
P0641 SATURN 5 Volt Reference Voltage Incorrect
P0641 SUZUKI 5 Volt Reference Voltage Incorrect
P0641 VOLKSWAGEN Sensor Reference Voltage 'A' Circuit Open
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