P0642 2017 Chevrolet Silverado Code - 5 Volt Reference 1 Circuit Low Voltage
Quick Answer
The P0642 diagnostic trouble code (DTC) for the 2017 Chevrolet Silverado indicates a problem with the 5-volt reference circuit 1, specifically a low voltage condition. Common causes include Faulty sensor drawing excessive current from the 5-volt reference circuit, Short or open circuit in the wiring harness, Damaged ECM affecting the voltage supply. 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 2017 Chevrolet Silverado indicates 5 Volt Reference 1 Circuit Low Voltage.
- Common causes
- Common causes include Faulty sensor drawing excessive current from the 5-volt reference circuit, Short or open circuit in the wiring harness, Damaged ECM affecting the voltage supply.
- 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.
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Code P0642 2017 Chevrolet Silverado Description
The P0642 diagnostic trouble code (DTC) for the 2017 Chevrolet Silverado indicates a problem with the 5-volt reference circuit 1, specifically a low voltage condition. The 5-volt reference circuit is crucial for various sensors and components in the vehicle to function properly. This circuit provides a stable 5-volt power supply to sensors like the throttle position sensor, manifold absolute pressure sensor, and others. When the voltage on this circuit drops below the specified range, it can lead to performance issues and potential long-term damage if not addressed promptly.
Common Causes of P0642 2017 Chevrolet Silverado
- Faulty sensor drawing excessive current from the 5-volt reference circuit.
- Short or open circuit in the wiring harness.
- Damaged ECM affecting the voltage supply.
- Power supply issues to the 5-volt reference circuit.
- Corrosion or poor connections in the circuit.
Symptoms of P0642 2017 Chevrolet Silverado
- Check engine light illuminated on the dashboard.
- Rough idling or stalling.
- Hesitation or lack of power during acceleration.
- Inaccurate sensor readings affecting engine performance.
- Potential no-start condition.
How to Fix P0642 2017 Chevrolet Silverado
- Begin by using a diagnostic scanner to retrieve the trouble code and identify the specific sensor or circuit causing the low voltage condition.
- Inspect the wiring harness for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
- Test the affected sensors for proper operation and current draw. Replace any faulty sensors.
- Check the ECM for any signs of damage or malfunction. If necessary, reprogram or replace the ECM.
- Clear the trouble code from the ECM's memory and perform a test drive to ensure the issue has been resolved.
Cost to Fix P0642 2017 Chevrolet Silverado
The typical repair costs for addressing a P0642 code on a 2017 Chevrolet Silverado can vary depending on the specific cause of the issue. Parts such as sensors or an ECM replacement can range from $100 to $500, while labor costs can add another $100 to $300 to the total bill. Overall, the repair for this code may cost between $200 and $800, including parts and labor. However, it's important to note that diagnosis time and labor rates at auto repair shops can fluctuate based on location, vehicle make and model, and other factors. It's advisable to inquire about local rates for a more accurate estimate.
Tech Notes for P0642 2017 Chevrolet Silverado
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
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Frequently Asked Questions about P0642 2017 Chevrolet Silverado Code
What does the OBDII code P0642 mean for a 2017 Chevrolet Silverado?
Code P0642 indicates a low voltage issue in the 5-volt reference circuit 1, which is used to power various sensors in the vehicle.
What are the common symptoms of code P0642 in a 2017 Chevrolet Silverado?
Symptoms may include engine hesitation, poor performance, reduced fuel efficiency, illuminated check engine light, or erratic sensor readings.
What causes the P0642 code to appear on a 2017 Chevrolet Silverado?
Causes can include a shorted sensor, damaged wiring, corroded connectors, or a malfunctioning powertrain control module (PCM).
Can driving with code P0642 damage my 2017 Chevrolet Silverado?
While it may not cause immediate damage, driving with code P0642 can lead to poor performance and potentially cause further issues if the problem isn't addressed.
Which sensors might be affected by the P0642 code in a 2017 Chevrolet Silverado?
Sensors affected may include the throttle position sensor (TPS), manifold absolute pressure (MAP) sensor, or other components relying on the 5-volt reference.
How do I diagnose the P0642 code on a 2017 Chevrolet Silverado?
Diagnosis involves inspecting wiring, connectors, and sensors associated with the 5-volt reference circuit and performing voltage tests with a multimeter.
What tools are needed to troubleshoot the P0642 code on a 2017 Chevrolet Silverado?
Basic tools include a multimeter for voltage testing, an OBDII scanner, and possibly a wiring diagram for the vehicle.
Can a bad PCM cause code P0642 on a 2017 Chevrolet Silverado?
Yes, a malfunctioning PCM can cause this code if it fails to properly supply or regulate the 5-volt reference circuit.
How much does it cost to fix the P0642 code on a 2017 Chevrolet Silverado?
Repair costs vary depending on the issue but can range from $50 for minor wiring repairs to over $500 if the PCM or sensors need replacement.
Is the P0642 code a common issue for a 2017 Chevrolet Silverado?
While not extremely common, the P0642 code can occur if the 5-volt reference circuit is compromised due to wiring damage, sensor failure, or electrical issues.
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