What does code P0561 mean?
The ECU detects unstable system voltage, causing inconsistent electrical operation across vehicle systems.
OBD-II Code
P0561 — System Voltage Unstable
The ECU detects unstable system voltage, causing inconsistent electrical operation across vehicle systems.
Common symptoms
- Flickering lights
- electrical faults
- erratic transmission behavior
Possible causes
- Intermittent alternator output
- poor ground connections
- weak or failing battery
Initial recommendation
Inspect alternator output stability, check battery terminals, grounds and voltage regulator.
Safety notice
This information is for guidance only and does not replace a physical vehicle inspection or diagnosis by a qualified mechanic. If the vehicle has severe power loss, smoke, a fuel odor, overheating, brake or steering problems, or any unsafe behavior, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine code P0561 with your vehicle's actual symptoms for more complete diagnostic guidance.
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