AutoCodes – Chevrolet – P0643 2014 Chevrolet Silverado

P0643 2014 Chevrolet Silverado Code - 5 Volt Reference 1 Circuit High 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: P0643 2014 Chevrolet Silverado indicates 5 Volt Reference 1 Circuit High 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.

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Code Popularity 351

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 17, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0643 2014 Chevrolet Silverado Description

The Engine Control Module (ECM) has four (4) internal 5 Volt reference circuits (Some models have two (2) internal 5 Volt reference circuits). Each internal reference circuit provides external 5 Volt reference circuits for more than one sensor. A short to ground or short to voltage on one external 5 Volt reference circuit can affect all the components connected to the same internal 5 Volt reference circuit. The Diagnostic Trouble Code (DTC) will be set when the ECM detects a higher than the expected voltage on any of the 5 Volt reference circuits for greater than 0.5 s.

OBDII Code P0643 2014 Chevrolet Silverado - 5 Volt Reference 1 Circuit High Voltage - AutoCodes.com — P0643 2014 Chevrolet Silverado Code - 5 Volt Reference 1 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0643 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 P0643 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.

What does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0643 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 P0643 2014 Chevrolet Silverado code?

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Need Help with the 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 P0643 2014 Chevrolet Silverado Code

1. What does the OBDII code P0643 mean for my 2014 Chevrolet Silverado?

The code P0643 indicates a high voltage condition in the 5-volt reference circuit 1 of your vehicle.

2. What are the common symptoms associated with the P0643 code on a 2014 Chevrolet Silverado?

Common symptoms of the P0643 code include engine stalling, rough idling, poor acceleration, and potential issues with the vehicle's electrical systems.

3. What are the possible causes of the P0643 code on a 2014 Chevrolet Silverado?

Potential causes of the P0643 code include a faulty 5-volt reference circuit, damaged wiring or connectors, a defective sensor or component connected to the circuit, or a problem with the Engine Control Module (ECM).

4. How can I diagnose the P0643 code on my 2014 Chevrolet Silverado?

Diagnosing the P0643 code involves using a diagnostic scanner to retrieve the trouble codes, testing the 5-volt reference circuit for voltage irregularities, inspecting the wiring and connectors for damage, and checking the sensors or components connected to the circuit.

5. Can I still drive my 2014 Chevrolet Silverado with the P0643 trouble code?

It is not recommended to drive your vehicle with the P0643 code present, as it can lead to potential performance issues and further damage to the vehicle's systems.

6. How can I repair the P0643 code on my 2014 Chevrolet Silverado?

Repairing the P0643 code may involve replacing damaged wiring or connectors, addressing any faulty sensors or components, and resetting the ECM to clear the trouble code.

7. Is it possible to reset the P0643 trouble code on a 2014 Chevrolet Silverado without repairing the issue?

While you can clear the trouble code using a diagnostic scanner, it is essential to address the underlying problem causing the P0643 code to prevent further issues with your vehicle.

8. How much does it typically cost to repair the P0643 code on a 2014 Chevrolet Silverado?

The cost of repairing the P0643 code can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Can a DIY enthusiast fix the P0643 code on a 2014 Chevrolet Silverado?

While some aspects of diagnosing and repairing the P0643 code can be tackled by a DIY enthusiast with the right tools and knowledge, it is recommended to seek professional help for a thorough and accurate repair.

10. How often does the P0643 code occur in a 2014 Chevrolet Silverado?

The occurrence of the P0643 code can vary depending on the vehicle's condition and maintenance history, but it is not a common code seen in everyday driving situations.