P0563 code meaning
System Voltage High
What P0563 means
The module measures its own supply voltage. CARB allows other monitors to be suspended below 11 V, and above a maker's threshold only if the voltage itself is diagnosed – that is what these codes record. GM's engine modules and Ford's PCM set them without warning lamp. P0563 means the voltage is above its threshold: GM's engine module 18 V or more in 400 of 500 samples, type C; Saab's 9-4X above 18 V for 5 s. Typical are an overcharging regulator or a jump start or charger at 24 V. Saab's EDC16 diesel reports the same condition as P0560 instead.
P0563 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0563
- Charge warning
- Bulbs burning out, flickering lights
- Several modules switch off or report faults
Common causes of P0563
- Most likelyRegulator or alternator overcharging
- Possible24 V jump start or fast charger
- PossibleMissing battery or poor battery terminal (voltage spikes)
- Less likelyAlternator control line from the module (smart charging)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
BatteryAlternatorModule power supplyEngine control module
What each part of P0563 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| 63 | The exact fault in that area. |
What to do next
- Note P0563 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0563
What does P0563 mean?
P0563 means "System Voltage High". The module measures its own supply voltage. It is a generic code, so it means the same on every make.
Is it safe to drive with P0563?
P0563 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0563 fail an emissions test?
P0563 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0563 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0563 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.