P0563: System Voltage High
Charging voltage is higher than it should be. Usually the alternator's regulator.
Green, yellow, red: three ways P0563 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Set once.
Schedule a repair
Lights bright or bulbs failing. Repair soon; overcharging ruins batteries.
Stop and get help
Battery hot, hissing or smelling of rotten eggs. Stop and don't charge further.
Symptoms you might notice
- Bulbs burning out
- Battery smell
- Gauges acting up
Common causes, cheapest first
- Failed voltage regulator or alternator
- Poor battery sensor or ground
What you can check before calling
- Have the charging system tested
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Want the full story? Read our guide: Bad alternator or bad battery? How to tell.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
Related codes
More idle, speed & electrical codes
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P0563 mean?
P0563 means "System Voltage High". Charging voltage is higher than it should be. Usually the alternator's regulator.
Can I drive with code P0563?
It depends on what the vehicle is doing. Green: Set once. Yellow: Lights bright or bulbs failing. Repair soon; overcharging ruins batteries. Red: Battery hot, hissing or smelling of rotten eggs. Stop and don't charge further.
What causes P0563?
The most common causes are: failed voltage regulator or alternator; poor battery sensor or ground.
Is P0563 a serious code?
It can be. Battery hot, hissing or smelling of rotten eggs. Stop and don't charge further.
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