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Engine-Codes – Chevrolet – P0642 2014 Chevrolet Silverado

P0642 2014 Chevrolet Silverado Code - 5 Volt Reference 1 Circuit Low Voltage

Quick Answer

The P0642 diagnostic trouble code (DTC) for a 2014 Chevrolet Silverado refers to a 5 Volt Reference 1 Circuit Low Voltage. Common causes include Faulty wiring harness connections, Failed sensor (such as throttle position sensor or manifold absolute pressure sensor), Corrosion or damage to the 5-volt reference circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0642 2014 Chevrolet Silverado indicates 5 Volt Reference 1 Circuit Low Voltage.
Common causes
Common causes include Faulty wiring harness connections, Failed sensor (such as throttle position sensor or manifold absolute pressure sensor), Corrosion or damage to the 5-volt reference circuit.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code P0642 2014 Chevrolet Silverado Description

The P0642 diagnostic trouble code (DTC) for a 2014 Chevrolet Silverado refers to a 5 Volt Reference 1 Circuit Low Voltage. This code indicates that the voltage on the 5-volt reference circuit is lower than the expected range. The 5-volt reference circuit is a crucial component in the vehicle's electronic control system, providing a stable 5-volt power supply to various sensors and components throughout the engine and transmission systems.

OBDII Code P0642 2014 Chevrolet Silverado - 5 Volt Reference 1 Circuit Low Voltage
P0642 2014 Chevrolet Silverado Code - 5 Volt Reference 1 Circuit Low Voltage

Common Causes of P0642 2014 Chevrolet Silverado

  1. Faulty wiring harness connections
  2. Failed sensor (such as throttle position sensor or manifold absolute pressure sensor)
  3. Corrosion or damage to the 5-volt reference circuit
  4. Issues with the power supply or ground connections
  5. Electronic control module (ECM) malfunction

Symptoms of P0642 2014 Chevrolet Silverado

  1. Rough idling or stalling
  2. Poor acceleration or hesitation
  3. Engine misfires
  4. Check Engine Light illuminated
  5. Limp mode activation

How to Fix P0642 2014 Chevrolet Silverado

  1. Perform a thorough inspection of the wiring harness and connectors for any signs of damage or corrosion. Repair or replace as necessary.
  2. Test the sensors connected to the 5-volt reference circuit to identify any faulty components. Replace any malfunctioning sensors.
  3. Check the power supply and ground connections to ensure they are secure and free of corrosion. Clean or repair as needed.
  4. Clear the DTC and reset the ECM to see if the code reappears. If it does, further diagnostic testing may be required to pinpoint the exact cause of the low voltage issue.
  5. If all else fails, consider seeking professional help from a certified mechanic or dealership to diagnose and repair the underlying problem.

Cost to Fix P0642 2014 Chevrolet Silverado

The typical repair costs for addressing a P0642 code on a 2014 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, parts and labor for this type of repair could range from $100 to $500. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to check with local auto repair shops for a more accurate estimate based on your specific circumstances.

What does this mean?

Tech Notes for P0642 2014 Chevrolet Silverado

Disconnecting one component at a time from the affected 5 Volt reference circuit while observing the scan tool 5 Volt Reference Circuit Status parameter may help locate the fault. The scan tool parameter will change from Malfunction to OK when the source of the fault is disconnected. If all 5 Volt reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring harness.



The 5 Volt reference 1 circuit provides 5 Volt to the following sensors: (Some models may have different sensors, please consult the factory service manual for the list of sensors for your model and year)



- Air conditioning (A/C) refrigerant pressure sensor

- Camshaft position sensor

- Engine oil pressure sensor

- Fuel pressure sensor

- Fuel rail pressure sensor

- Fuel tank pressure sensor

- Multifunction intake air sensor

Need more information about the P0642 2014 Chevrolet Silverado code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0642 2014 Chevrolet Silverado Code

1. What does the OBDII code P0642 mean on a 2014 Chevrolet Silverado?

P0642 indicates a low voltage issue in the 5-volt reference circuit 1, which is essential for proper sensor operation.

2. What are the common symptoms of a P0642 code in a 2014 Chevrolet Silverado?

Symptoms may include poor engine performance, stalling, misfires, reduced fuel efficiency, and the check engine light illuminating.

3. What causes the P0642 code to appear on a 2014 Chevrolet Silverado?

Common causes include a short to ground in the 5-volt reference circuit, a faulty sensor, damaged wiring, or a malfunctioning engine control module (ECM).

4. Which sensors use the 5-volt reference circuit in a 2014 Chevrolet Silverado?

Sensors like the throttle position sensor (TPS), manifold absolute pressure (MAP) sensor, and crankshaft position sensor rely on the 5-volt reference circuit.

5. How can I diagnose the P0642 code on my 2014 Chevrolet Silverado?

Start by inspecting the wiring and connectors for damage or corrosion, test the 5-volt reference circuit for shorts, and check the sensors connected to this circuit.

6. Can a bad sensor cause a P0642 code in a 2014 Chevrolet Silverado?

Yes, a faulty sensor drawing excessive current or shorting the circuit can trigger this code.

7. Is it safe to drive with a P0642 code on a 2014 Chevrolet Silverado?

Driving with this code is not recommended, as it can lead to poor performance, potential stalling, and further damage to the vehicle.

8. How do you fix a P0642 code on a 2014 Chevrolet Silverado?

Repairs may include fixing or replacing damaged wiring, cleaning corroded connectors, replacing a faulty sensor, or reprogramming or replacing the ECM if necessary.

9. Can a failing ECM cause a P0642 code on a 2014 Chevrolet Silverado?

Yes, a malfunctioning ECM can cause incorrect voltage regulation and trigger this code.

10. What tools are needed to troubleshoot the P0642 code on a 2014 Chevrolet Silverado?

You’ll need an OBDII scanner, a multimeter to check for voltage and continuity, and potentially a wiring diagram for the vehicle.

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