What causes a P0563 code?

Common causes: Failing voltage regulator; Bad ground; Failing alternator.

What are the symptoms of a P0563 code?

Typical symptoms: Bright/flickering lights; CEL; Battery damage over time.

No — this code can cause damage if you keep driving. Get it diagnosed before continuing. Estimated repair: $100-$700.

OBD-II Code · Body

System Voltage High

high severityDo not drive$100-$700

System voltage above threshold (>15.5V typical).

Common symptoms

Likely causes

Where to start

Try the cheapest cause first. Start by checking: failing voltage regulator.
Cost & scope. $100-$700
If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there. Don't keep driving with this one active — risk of damage.

Look up another code

More free tools