P0642 2014 Chevrolet Silverado Code - 5 Volt Reference 1 Circuit Low Voltage
Quick Answer
The Engine Control Module (ECM) has four (4) internal 5 Volt reference circuits (Some models have two (2) internal 5 Volt reference circuits). Common causes include Faulty Sensor on 5 Volt circuit, Sensor on 5 Volt circuit harness is open or shorted, Sensor on 5 Volt circuit poor electrical connection. 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 Sensor on 5 Volt circuit, Sensor on 5 Volt circuit harness is open or shorted, Sensor on 5 Volt circuit poor electrical connection.
- 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.
Code P0642 2014 Chevrolet Silverado Description
What are the Possible Causes of the DTC P0642 2014 Chevrolet Silverado?
- Faulty Sensor on 5 Volt circuit
- Sensor on 5 Volt circuit harness is open or shorted
- Sensor on 5 Volt circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0642 2014 Chevrolet Silverado?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
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
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0642 2014 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0642 2014 Chevrolet Silverado code?
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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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