P0562 System Voltage Low

P0562 indicates system voltage is low. The controller detected vehicle electrical voltage below the expected range for reliable module, actuator, and sensor operation.

Code details

Generic OBD-II · P0

System: Speed / Idle
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not chase unrelated sensor codes until low system voltage and power-ground integrity are corrected.

Symptoms of P0562

Unstable, high, or low idle, or stalling.
Erratic speedometer, cruise-control, or shift behaviour.
Check-engine light with a hesitation or surge.

Common causes of P0562

A dirty throttle body, idle-control valve, or throttle-position sensor.
A failing vehicle-speed or wheel-speed sensor, or its wiring.
Vacuum leaks or a related sensor forcing the idle/speed strategy.

Useful checks before replacing parts

Check battery voltage, charging voltage, voltage drop on power and ground circuits, freeze-frame RPM, load state, and related charging or communication codes.
Inspect battery condition, alternator output, belt drive, main grounds, fusible links, corroded terminals, parasitic loads, and module power feeds.
Measure voltage during cranking, idle, electrical load, and road operation to identify when the low-voltage event occurs.

Related OBD-II codes

These nearby speed / idle entries can help compare wording and pin down the fault area.