P0560
System Voltage Malfunction
A general fault in the system voltage seen by the ECU — value implausible, missing, or unstable but without crossing the specific thresholds of P0562 (low) or P0563 (high). Often appears intermittently with a marginal alternator or weak battery.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Charging system marginal (aged battery or alternator)Common
- Corroded battery terminals or ground strapPossible
Parts involved
- Battery
- Alternator
- Battery Cables
P0560 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.