OBD-II Code · Body
P0563
System Voltage High
Severity
high
Left alone, this one tends to take other parts with it.
Can you drive it
Not for long
Driving on this one risks further damage. Get it to a shop rather than carrying on with it.
Indicative cost (USD)
$100–$700
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
System voltage above threshold (>15.5V typical).
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Bright/flickering lights
- Check engine light
- Battery damage over time
Likely causes
- Failing voltage regulatorMost common
- Bad ground
- Failing alternator
Read the full diagnostic procedureP0563 sets when system voltage at the PCM exceeds the high threshold, typically over 16.0 to 16.5 volts, indicating an overcharging condition or a st…
P0563 sets when system voltage at the PCM exceeds the high threshold, typically over 16.0 to 16.5 volts, indicating an overcharging condition or a stuck-open voltage regulator.
Cheapest-first
- measure battery voltage with engine at 2000 rpm.
- Anything over 15.0V sustained is genuine overcharge and will boil the battery within hours of driving.
- Most modern alternators have an internal regulator integrated with the brush holder; the field circuit can stick on if the PCM's field-control driver fails or if a sensor input the PCM uses for charge management (battery temperature sensor on GM, BCM-commanded setpoint on Ford and Chrysler) reports incorrectly.
- Verify the battery temp sensor's reading and resistance before condemning the alternator.
- On Chrysler vehicles, the PCM commands field duty cycle directly, so a PCM ground-circuit fault can drive 100 percent field and produce 17V output.
- Expensive misdiagnosis: replacing the alternator on a Ford or Chrysler when the real fault is a body control module or PCM ground drop.
Vehicle-specific patterns2005-2010 Dodge Charger, Magnum, and Chrysler 300 with the 5.7L Hemi have a known TIPM-driven overcharge fault that pushes voltage to 16+ volts; the…
- 2005-2010Dodge Charger, Magnum, and Chrysler 300 with the 5.7L Hemi have a known TIPM-driven overcharge fault that pushes voltage to 16+ volts; the TIPM bulletin covers many of these.
- 2004-2008Ford F-150 5.4L 3-valve sees the smart-charge module misread battery temperature when its sensor wire chafes on the inner fender, commanding excessive field.
- 2007-2013GMC Sierra and Chevrolet Silverado 1500 have intermittent body-control-module faults that command alternator setpoint to maximum, especially after a poor jump-start that surged the BCM.
- 2003-2009Toyota 4Runner V8 alternator internal regulator sticks on after 150K miles, producing genuine 15.5 to 16.5V output.
Estimated repair$150 to $720.
Look up another code
P0563 — frequently asked
What does a P0563 code mean?
System voltage above threshold (>15.5V typical).
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; Check engine light; Battery damage over time.
Is it safe to drive with a P0563 code?
Not for long. Driving on this one risks further damage. Get it to a shop rather than carrying on with it. Estimated repair: $100-$700.
How do I diagnose a P0563 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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