System Voltage Malfunction (P0560)
The P0560 code indicates that the Powertrain Control Module (PCM) has detected a system voltage outside the normal operating range (typically 9-16 volts). This can be caused by a failing alternator, a weak battery, corroded battery terminals, or wiring issues. The PCM monitors voltage at its main power input and triggers this code when voltage is too high or too low for a specified period.
01. Most Common Causes
- Faulty alternator not charging properly
- Weak or dead battery
- Corroded or loose battery terminals
- Damaged wiring or poor ground connections
- Faulty PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Battery warning light on dashboard
- Dimming headlights or interior lights
- Slow engine crank or no start
- Electrical accessories malfunctioning
03. Step-by-Step Diagnosis
Step 1: Check battery voltage with engine off (should be ~12.6V).
Step 2: Check charging voltage with engine running (should be 13.5-14.5V).
Step 3: Inspect battery terminals and cables for corrosion or looseness.
Step 4: Test alternator output and voltage regulator.
Step 5: Check for blown fuses related to the charging system.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Low voltage can cause stalling, poor performance, and may leave you stranded. High voltage can damage electronic components. Have it diagnosed promptly.
How much does it cost to fix?▼
Costs vary: battery replacement $100-$200, alternator replacement $300-$600, terminal cleaning $50-$100. Diagnostic fee typically $50-$150.