OBD II Fault Code P0643 :

Description of Fault code P0643

SENSOR REFERENCE VOLTAGE A CIRCUIT HIGH VOLTAGE

Possible failuer P0643

• Sensor reference voltage A (Engine Control Module (ECM) internal)
• Sensor reference voltage harness (FRP Sensor, MAF Sensor, boost pressure Sensor, APP A)

Diagnostic Procedure using AutoHex II Scan Tool

• The Sensor reference voltage is detected more than a specified value for a set period of time.

Test Conditions using AutoHex tester

• Continuously

Clear Fault codes Conditions

• The Sensor reference voltage is detected more than a specified value for a set period of time.

MIL Status

• Check Engine Light ON

Note:

• AutoHex II is a professional Auto diagnostic.
• This fault code is a GERENRIC fault code, some cars may change the meaning of this fault code.
  To get the accurate fault code description you may use AutoHex II

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