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