P0561 - System Voltage Unstable

System voltage is unstable instead of staying in the normal range.

Code Overview

System voltage is unstable instead of staying in the normal range.

Common Causes

• Weak battery or charging issue
• Poor battery or ground connection
• Alternator or regulator fault

Diagnostic Steps

1. Measure battery and charging voltage
2. Inspect terminals and grounds for voltage drop
3. Check alternator output under load

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.