Fault-Code Library · Electrical power
P0562: System voltage low
System voltage fell below the level expected by the ECU during operation.
Common symptoms
- •Multiple warning lights
- •Hard starting
- •Module communication faults
- •Random electrical behavior
Likely causes
- •Weak battery
- •Charging-system fault
- •Poor ground or terminal connection
- •Voltage drop during cranking
First checks
- •Load-test the battery
- •Check alternator output
- •Inspect main grounds and terminal voltage drop
Important
Low voltage can create misleading faults across many modules, especially on German cars.
A fault code identifies a detected condition, not a failed part. Confirm manufacturer-specific subcodes and live data.
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