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P0560 2017 GMC Sierra Code - System Voltage Malfunction

Quick Answer

The P0560 code indicates a system voltage malfunction, which signifies that the vehicle's onboard computer has detected a voltage level that is outside the normal operating range. Common causes include Faulty Alternator: A malfunctioning alternator may not be charging the battery properly, leading to low voltage, Weak or Dead Battery: An old or failing battery may not hold a charge, causing voltage drops, Corroded or Loose Connections: Poor electrical connections at the battery, alternator, or ground points can lead to voltage fluctuations. 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
P0560 2017 GMC Sierra indicates System Voltage Malfunction.
Common causes
Common causes include Faulty Alternator: A malfunctioning alternator may not be charging the battery properly, leading to low voltage, Weak or Dead Battery: An old or failing battery may not hold a charge, causing voltage drops, Corroded or Loose Connections: Poor electrical connections at the battery, alternator, or ground points can lead to voltage fluctuations.
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.
What is this?
Table of contents Created and updated by William Orellana on Oct 17, 2024
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Code P0560 2017 GMC Sierra Description

The P0560 code indicates a system voltage malfunction, which signifies that the vehicle's onboard computer has detected a voltage level that is outside the normal operating range. This code is primarily associated with the vehicle's power supply system, which includes the battery, alternator, and various electrical connections. When the voltage is too low (under approximately 9 volts) or too high (over 16 volts), it can lead to erratic behavior of the vehicle's electronic systems.

OBDII Code P0560 2017 GMC Sierra - System Voltage Malfunction
P0560 2017 GMC Sierra Code - System Voltage Malfunction

Common Causes of P0560 2017 GMC Sierra

  1. Faulty Alternator: A malfunctioning alternator may not be charging the battery properly, leading to low voltage.
  2. Weak or Dead Battery: An old or failing battery may not hold a charge, causing voltage drops.
  3. Corroded or Loose Connections: Poor electrical connections at the battery, alternator, or ground points can lead to voltage fluctuations.
  4. Faulty Voltage Regulator: A malfunctioning voltage regulator can cause overcharging or undercharging of the battery.
  5. Damaged Wiring: Frayed or damaged wiring in the electrical system can lead to shorts or open circuits, affecting voltage levels.

Symptoms of P0560 2017 GMC Sierra

  1. Dashboard Warning Lights: The battery or check engine light may illuminate, indicating a potential electrical issue.
  2. Dimming or Flickering Lights: Headlights and interior lights may dim or flicker, particularly at idle or when electrical loads change.
  3. Starting Issues: Difficulty starting the vehicle, including slow cranking or no response when turning the key.
  4. Erratic Electrical Behavior: Malfunctioning electronic components, such as power windows, radio, or climate control systems.
  5. Stalling or Rough Idle: The engine may stall or run roughly due to inconsistent voltage supply to the ECM.

How to Fix P0560 2017 GMC Sierra

  1. Visual Inspection: Begin with a thorough visual inspection of the battery, alternator, and wiring for any signs of damage, corrosion, or loose connections.
  2. Battery Testing: Use a multimeter to check the battery voltage and perform a load test to determine its health.
  3. Alternator Testing: Test the alternator output to ensure it is charging the battery correctly, typically between 13.5 to 14.5 volts while the engine is running.
  4. Check Voltage Regulator: Inspect and test the voltage regulator to ensure it is functioning correctly and maintaining the appropriate voltage levels.
  5. Repair or Replace Components: Based on the findings, repair or replace any faulty components, including the battery, alternator, or wiring, to restore proper voltage levels.

Cost to Fix P0560 2017 GMC Sierra

The cost to diagnose and repair a P0560 code can vary widely based on the specific issue and the labor rates in your area. On average, you can expect to pay between $100 and $300 for diagnosis and repair. If the problem is related to the alternator, replacement costs can range from $300 to $800, including parts and labor. Battery replacement typically costs between $100 and $200.

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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 P0560 2017 GMC Sierra Code

1. What does the OBDII code P0560 mean on a 2017 GMC Sierra?

P0560 indicates a "System Voltage Malfunction," meaning the vehicle's powertrain control module (PCM) has detected an issue with the electrical system's voltage being outside the normal range.

2. What are the common symptoms of code P0560 in a 2017 GMC Sierra?

Symptoms may include difficulty starting the engine, dim or flickering lights, warning lights on the dashboard, erratic instrument cluster behavior, or poor engine performance.

3. What causes the P0560 code to appear on a 2017 GMC Sierra?

Common causes include a faulty alternator, a bad battery, loose or corroded battery terminals, damaged wiring, or an issue with the PCM itself.

4. Can a failing alternator trigger the P0560 code in a 2017 GMC Sierra?

Yes, a failing alternator can cause the system voltage to drop or fluctuate, which can trigger the P0560 code.

5. How can I diagnose the P0560 code on my 2017 GMC Sierra?

Start by checking the battery voltage with a multimeter. Inspect the battery terminals, alternator, and wiring for damage or corrosion. If no issues are found, further diagnostics using a scan tool may be required.

6. Is it safe to drive with the P0560 code on a 2017 GMC Sierra?

Driving with this code can be risky, as electrical system issues may lead to stalling, loss of power, or failure of critical systems like the headlights or power steering.

7. How do I fix the P0560 code on a 2017 GMC Sierra?

Repairs may include replacing a failing alternator or battery, cleaning or tightening battery terminals, fixing damaged wiring, or reprogramming or replacing the PCM if necessary.

8. Can a weak battery cause the P0560 code on a 2017 GMC Sierra?

Yes, a weak or failing battery can cause low voltage, leading to the P0560 code.

9. How much does it typically cost to fix the P0560 code on a 2017 GMC Sierra?

Repair costs can range from $100 for battery terminal cleaning to $500–$1,000 for an alternator replacement or PCM repair, depending on the specific issue.

10. Will clearing the P0560 code solve the problem on a 2017 GMC Sierra?

Clearing the code may temporarily remove the warning, but the underlying electrical issue must be fixed to prevent the code from returning.

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