P0641 - Sensor Reference Voltage 'A' Circuit/Open

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?

Possible causes

  • Faulty Engine Control Module (ECM)
  • ECM harness is open or shorted
  • ECM circuit poor electrical connection
  • Shorted sensor on 5 volt circuit
  • 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 Description

    The control module has 2 internal 5-volt reference buses called "5-volt reference 1" and"5-volt reference 2". Each reference bus provided 5-volt reference circuit for more than one sensor. Therefore, a fault condition on one 5-volt reference circuit will affect the other 5-volt reference circuits connected to the reference bus. The control module monitors the voltage on the 5-volt reference buses.
    OBDII Code P0641 - Sensor Reference Voltage 'A' Circuit/Open - Engine-Codes.com

    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
  • Related Information

    Repair Importance Level: 3
     
    1=Low 2=Medium 3=High  
    Repair Difficulty Level: 3
     
    1=Easy 2=Moderate 3=Hard  

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