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P0642 - Sensor Reference Voltage 'A' Circuit Low

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

When is the code detected?

The Engine Control Module (ECM) has detected the sensor 5 volt reference circuit voltage is lower than expected

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0642 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 P0642 - Sensor Reference Voltage 'A' Circuit Low -

P0642 Information for specific makes

P0642 AUDI Sensor Voltage Circuit 'A' Low Voltage
P0642 CHRYSLER Sensor Reference Voltage 1 Circuit Low
P0642 DODGE Sensor Reference Voltage 1 Circuit Low
P0642 FORD Sensor Reference Voltage 'A' Circuit Low
P0642 HYUNDAI Sensor Reference Voltage 'A' Circuit Low
P0642 ISUZU 5 Volt Reference 1 Circuit Low Voltage
P0642 JEEP Sensor Reference Voltage 1 Circuit Low
P0642 KIA Sensor Reference Voltage 'A' Circuit Low
P0642 LINCOLN Sensor Reference Voltage 'A' Circuit Low
P0642 MERCURY Sensor Reference Voltage 'A' Circuit Low
P0642 MITSUBISHI Throttle Position Sensor Power Supply
P0642 SUZUKI 5 Volt Reference 1 Circuit Low Voltage
P0642 VOLKSWAGEN Sensor Reference Voltage 'A' Circuit Low

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P0642 Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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