AutoCodes – GMC – P0563 2014 GMC Sierra

P0563 2014 GMC Sierra Code - System Voltage High

Quick Answer

The Powertrain Control Module (PCM) continuously monitors the system voltage. Common causes include Battery defective, Loose or missing alternator drive belt, Faulty alternator. 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: P0563 2014 GMC Sierra indicates System Voltage High.
Common causes: Common causes include Battery defective, Loose or missing alternator drive belt, Faulty alternator.
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 319

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 04, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0563 2014 GMC Sierra Description

The Powertrain Control Module (PCM) continuously monitors the system voltage. The system voltage information is taken from the PCM's ignition feed circuits. Voltages below 8.0 volts or above 17.1 volts cause improper system operation and/or component damage. If the system voltage is low the PCM raises the idle speed in order to increase the generator output. The PCM disables most outputs to protect the hardware if the system voltage is high. A scan tool may not display data if system voltage is outside this range. The Diagnostic Trouble Code (DTC) will be set if the PCM detects that the electrical system voltage level is too high.

OBDII Code P0563 2014 GMC Sierra - System Voltage High - AutoCodes.com — P0563 2014 GMC Sierra Code - System Voltage High

What does this mean?

What are the Possible Causes of the DTC P0563 2014 GMC Sierra?

Battery defective
Loose or missing alternator drive belt
Faulty alternator
Open or short system voltage circuit

How to Fix the DTC P0563 2014 GMC Sierra?

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

Higher than expected voltage problems are most likely caused by bad voltage regulator. The voltage regulator is part of the alternator.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0563 2014 GMC Sierra 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 P0563 2014 GMC Sierra 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 P0563 2014 GMC Sierra Code

What does the OBDII code P0563 mean for a 2014 GMC Sierra?

P0563 indicates the vehicle's powertrain control module (PCM) has detected a voltage level that is higher than expected in the electrical system.

What are common symptoms of code P0563 in a 2014 GMC Sierra?

Symptoms may include fluctuating dashboard lights, electronic accessory malfunctions, difficulty starting the vehicle, and potential stalling.

What causes the P0563 code to appear on a 2014 GMC Sierra?

Common causes include a faulty alternator, battery issues, loose or corroded electrical connections, or a malfunctioning voltage regulator.

Can a bad alternator cause the P0563 code?

Yes, a failing alternator can overcharge the electrical system, leading to excessive voltage and triggering the P0563 code.

How do you diagnose the P0563 code on a 2014 GMC Sierra?

Start by inspecting the battery, alternator, and electrical connections for damage or corrosion, then use a multimeter to measure voltage levels and confirm excessive readings.

Can driving with the P0563 code damage the vehicle?

Yes, prolonged high voltage can damage sensitive electronic components, including the PCM, sensors, and accessories.

How do you fix the P0563 code on a 2014 GMC Sierra?

Repairs typically involve replacing a faulty alternator or voltage regulator, cleaning or tightening electrical connections, or replacing the battery if necessary.

Is the P0563 code related to the battery in a 2014 GMC Sierra?

Yes, this code can be triggered by battery issues such as overcharging or poor connections.

Does the P0563 code affect fuel efficiency in a 2014 GMC Sierra?

While not directly related to fuel efficiency, electrical issues can lead to engine performance problems that may indirectly impact fuel consumption.

Can a faulty PCM cause the P0563 code?

While rare, a malfunctioning PCM or incorrect programming can occasionally misinterpret voltage readings and set the P0563 code.

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