P0642 GMC - Sensor Reference Voltage 'A' Circuit Low

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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P0642 GMC 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

First diagnose P0642 GMC code

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.

Cost of diagnosing the P0642 GMC code

    Labor: 1.0

    The cost of diagnosing the P0642 GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

When is the P0642 GMC code detected?

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

P0642 GMC 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

P0642 GMC More Information

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