P0642 GMC - Sensor Reference Voltage 'A' Circuit Low

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
Comments  |  Add Comment

Possible causes

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

When is the code detected?

The Powertrain Control Module (PCM) 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 Gmc Description

The Powertrain Control Module (PCM) has 2 internal 5-volt reference buses called
OBDII Code P0642 Gmc - Sensor Reference Voltage 'A' Circuit Low - AutoCodes.com

Need more help?

Get the P0642 Gmc code diagnosed by a professional: Find a repair shop in your area

Related Information

P0642 GMC Comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P0642 Gmc code? Have you replaced any parts?
Any information is appreciated. Thanks
Top ⇧