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 faulty alternator, battery, wiring issues, or a failing PCM. The code sets when the voltage is too high or too low for a specified period, potentially leading to electrical system instability and drivability concerns.
1. Most Common Causes
- Faulty or undercharged battery
- Damaged alternator or voltage regulator
- Loose or broken alternator belt
- Poor connection or corrosion at battery terminals
- Short or open circuit in charging system wiring
- Blown fuse or relay in the charging system
- Faulty PCM (uncommon)
2. 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
3. Step-by-Step Diagnosis
Step 1: Check battery voltage with a multimeter (should be 12.6V static, 13.5-14.5V running).
Step 2: Inspect battery terminals and cables for corrosion, looseness, or damage.
Step 3: Test alternator output at idle and under load.
Step 4: Check all relevant fuses and fusible links.
Step 5: If all else is fine, test PCM for proper voltage regulation.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Low voltage can cause stalling or no start; high voltage can damage sensitive electronics. Have it diagnosed promptly.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and minor repairs like cable cleaning. Alternator or battery replacement can cost $200-$600.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.