AutoCodes – GMC – P0561 2017 GMC Sierra

P0561 2017 GMC Sierra Code - System Voltage Performance

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: P0561 2017 GMC Sierra indicates System Voltage Performance.
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 236

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
Cost to Diagnose
FAQs
Comments
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Code P0561 2017 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 when the System Voltage detects a system voltage below or above a threshold.

OBDII Code P0561 2017 GMC Sierra - System Voltage Performance - AutoCodes.com — P0561 2017 GMC Sierra Code - System Voltage Performance

What does this mean?

What are the Possible Causes of the DTC P0561 2017 GMC Sierra?

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

How to Fix the DTC P0561 2017 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0561 2017 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 P0561 2017 GMC Sierra 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 P0561 2017 GMC Sierra Code

1. What does OBDII code P0561 mean on a 2017 GMC Sierra?

Code P0561 indicates a "System Voltage Performance" issue, meaning the vehicle's powertrain control module (PCM) has detected inconsistent or unstable voltage levels.

2. What are the common symptoms of code P0561 in a 2017 GMC Sierra?

Symptoms may include fluctuating dashboard lights, dim or flickering headlights, trouble starting the engine, or the vehicle entering limp mode.

3. What causes the P0561 code on a GMC Sierra?

Common causes include a failing alternator, a weak or faulty battery, poor electrical connections, corroded battery terminals, or a malfunctioning PCM.

4. Can a bad alternator trigger the P0561 code?

Yes, a failing alternator that cannot maintain consistent voltage output can cause the P0561 code to appear.

5. How do I diagnose code P0561 on my 2017 GMC Sierra?

Start by checking the battery voltage and alternator output with a multimeter, inspect battery terminals for corrosion, and look for loose or damaged electrical connections.

6. Is it safe to drive with the P0561 code on my GMC Sierra?

Driving with this code is not recommended, as inconsistent voltage can lead to unpredictable performance and potential damage to the electrical system.

7. Can a weak battery cause the P0561 code?

Yes, a weak or failing battery that cannot supply stable voltage can trigger this code.

8. How do I fix the P0561 code on a 2017 GMC Sierra?

Repairs may include replacing the alternator, battery, or damaged wiring, cleaning corroded battery terminals, or reprogramming the PCM if necessary.

9. Will clearing the P0561 code fix the problem?

Clearing the code without addressing the underlying issue will not fix the problem, as the code will likely return.

10. How much does it cost to repair the P0561 code on a GMC Sierra?

The cost depends on the cause. Battery replacement may cost $100-$300, alternator replacement $400-$800, and PCM repairs or reprogramming can exceed $500.