P0563 — System Voltage High
Category: Powertrain Severity: Medium
Updated:
DTC code P0563 means: System Voltage High. It falls under the "Powertrain" category, with an estimated severity of Medium. Common causes include failed alternator voltage regulator, faulty ground or battery sensor and incorrectly connected charger or jump pack; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Failed alternator voltage regulator
- Faulty ground or battery sensor
- Incorrectly connected charger or jump pack
Symptoms
- Overly bright lights or blown bulbs
- Sulfur smell from the battery
- Battery light
- Electronic module glitches
How to diagnose it step by step
- Measure running voltage.
- Check grounds and the battery sensor.
- Replace the regulator or alternator.
How to fix it
If running voltage exceeds 15 V, the alternator regulator has failed. Replace the regulator or alternator promptly to avoid damaging electronics.
Estimated repair cost
Regulator: $50–150. Alternator: $350–800.
Frequently asked questions
What does DTC code P0563 mean?
System Voltage High.
Is code P0563 serious?
Severity Medium. Not urgent, but worth diagnosing to avoid bigger damage.
Can I keep driving with code P0563?
Avoid it: overvoltage can damage control modules and the battery.
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