Summary
P0562 means the PCM has detected that the system (charging) voltage has dropped below the expected threshold, typically below 10–11V during engine operation. The most common causes are a failing alternator (40%), a weak or dead battery (25%), and corroded battery cables or ground connections (20%). This code should be addressed promptly — if the alternator is failing, the vehicle will eventually stall when the battery is fully drained.
Severity: Moderate — electrical systems may malfunction
Safe to drive: Yes, short distances — risk of stalling if battery drains completely
Repair cost: $100–$400 depending on cause
DIY difficulty: Easy to Moderate
What does P0562 mean?
Your vehicle's electrical system operates at approximately 13.5–14.5 volts when the engine is running (charging voltage from the alternator). The battery provides 12.4–12.7 volts when the engine is off. The PCM monitors system voltage to ensure all electronic modules and sensors are receiving adequate power.
P0562 is set when the PCM detects system voltage below its calibrated threshold (typically 10–11.5V, depending on manufacturer) for a sustained period during engine operation. A brief dip during cranking is normal and does not trigger this code — the PCM looks for low voltage while the engine is running and the alternator should be charging.
Low system voltage affects everything electronic: sensors may send inaccurate readings, fuel injectors may not open fully, ignition coils may produce weak spark, and electronic modules may reset or behave erratically. You may notice dimming headlights, slow power windows, a battery warning light on the dashboard, and eventually a no-start condition.