P0563 on Infiniti: How to Diagnose & Fix
System Voltage High
1 Infiniti model · 1 documented issue · 1 critical · $200-$600 repair
P0563 on Infiniti by model: symptoms, diagnosis and fix
The 2022 QX55 debut year drew numerous complaints of the 12V battery failing to hold a charge or discharging prematurely, leaving the vehicle with a no-crank/no-start condition, key-detection errors and a cascade of dashboard warning messages at startup. In one reported case a battery-related electrical failure led to a sudden loss of power steering assist, a serious safety concern. Parasitic draw from the vehicle's electronics and short-trip driving accelerate the problem.
Common Symptoms
- No-crank / no-start, clicking on start
- Multiple dashboard warning messages at startup
- Key/fob not detected
- Dim or flickering interior/dash lights
- Battery repeatedly dead after sitting
- Reported loss of power steering assist with electrical failure
How to Fix
Load-test the battery and charging system; replace with a correct OEM-spec Group 35/AGM battery if degraded. If the battery drains while parked, perform a parasitic-draw test to isolate a module (infotainment/telematics) staying awake. Reprogram/replace the battery and register it if the system requires. Address any charging (alternator) fault and keep the battery topped up on a maintainer during long storage.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Duralast Platinum Group 48/H6 AGM batteryOEMAutoZone 319460 / H6-AGM
Confirmed failed-battery replacement branch after charging and testing Fitment/availability: H6-AGM, Group 48, 760 CCA, 120-minute reserve, top-right positive; AutoZone lists it as vehicle-specific for QX55 and the envelope matches the 2…
- NOCO GENIUS2 2-amp smart charger and maintainerOEMNOCO GENIUS2 / AutoZone 606158
Optional long-storage maintenance branch after battery chemistry is confirmed Fitment/availability: GENIUS2 supports 12V flooded, EFB and AGM maintenance modes. At 2 amp
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Sources for this issue (3)
P0563 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0563 mean on a Infiniti?
P0563 stands for "System Voltage High." This code indicates the engine computer detected that the vehicle's system (battery) voltage is higher than the normal operating range. The PCM monitors charging system voltage, and persistently high voltage usually points to an overcharging condition. Excessive voltage can damage the battery, sensitive electronics, and lighting if left unaddressed. On Infiniti it is documented across 1 model: QX55.
What are the most common causes of P0563?
The most common causes of P0563 are: Faulty voltage regulator in the alternator, Overcharging alternator, Poor ground or wiring connection at the alternator/battery, Faulty battery, Corroded battery terminals, PCM or charging-control module fault. The specific cause varies by vehicle.
How much does it cost to fix P0563 on a Infiniti?
Published repair estimates on Infiniti range from $200 to $600 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0563 on a different make?
View P0563 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.