P0560 moderate

System Voltage Malfunction

The P0560 code means the vehicle's onboard diagnostic system has detected: System Voltage Malfunction. This is a moderate severity code.

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Keep driving?: Short distances only
DIY difficulty: moderate
Estimated cost: $100 - $600 (parts and labor)

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Common Symptoms

Battery warning light on dash
Dim headlights or interior lights
Electrical accessories malfunctioning
Engine running rough or stalling
Check engine light on

Probable Causes (Ranked by Likelihood)

Failing alternator not maintaining proper voltage Very High
Weak or failing battery High
Corroded or loose battery cables/terminals High
Faulty voltage regulator (internal or external) Moderate
Damaged charging system wiring or main fuse Low

Step-by-Step Diagnostic Procedure

Measure battery voltage with engine off -- should be 12.4-12.7V for a fully charged battery
Measure voltage with engine running at idle -- should be 13.5-14.5V (alternator charging)
Load test the battery -- voltage should not drop below 9.6V during a 15-second load test
Inspect battery terminals and cable connections for corrosion -- clean with baking soda and wire brush
Test alternator output with a multimeter -- check for AC ripple voltage (should be less than 0.5V AC)

Frequently Asked Questions

Can I drive with code P0560?

You can drive short distances, but be aware that if the alternator is failing, the battery will eventually drain and the vehicle will stall. Avoid using high-draw accessories like AC, heated seats, and stereo to extend your driving range.

How do I know if it is the battery or the alternator?

Measure voltage with the engine running. If voltage is below 13.5V with the engine on, the alternator is likely failing. If the battery voltage is below 12.4V with the engine off and the alternator tests good, the battery needs replacement. Most auto parts stores will test both for free.

Can a bad battery cause this code?

Yes. A battery with a shorted cell or one that cannot hold a charge can cause system voltage to be abnormal, even if the alternator is working correctly. The PCM monitors system voltage and sets this code when it falls outside the expected 11.5-16V range.