P0563 on Honda: How to Diagnose & Fix
System Voltage High
1 Honda model · 1 documented issue · $300-$700 repair
P0563 on Honda by model: symptoms, diagnosis and fix
The alternator (or its integrated voltage regulator) commonly wears out around 100,000-150,000 miles, showing a battery/charging warning light, headlights and dash lights that dim at idle and brighten with revs, and eventually a no-start from a dead battery. On 2013-2016 cars the battery sensor is also under recall 17V-418 (moisture can enter the sensor case and short it, a fire risk), so the charging fault must be pinpointed before parts are replaced.
Common Symptoms
- Battery/charging warning light
- Headlights and dash lights dim at idle, brighten on rev
- Slow crank or no-start / dead battery
- Whining or growling from the alternator
- Electrical accessories acting erratically
How to Fix
Load-test the charging system and battery. Verify battery voltage rises to ~13.8-14.6V with the engine running before condemning the alternator. Replace the alternator with an OEM or quality reman unit and inspect the serpentine belt/tensioner and the main charging cable/grounds. On 2013-2016 cars, rule out the recalled battery sensor and wiring before assuming the alternator is at fault.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Honda 31100-R40-A01 / Denso CSF89 alternator assemblyOEMHonda 31100-R40-A01 / Denso CSF89
Replace a load-tested failed alternator on the eighth-generation L4 branch Fitment/availability: 2008-2012 Accord 2.4L L4 only, cataloged 5AT/5MT trims after VIN confirmation.
- Denso 210-4349 remanufactured alternatorOEMDenso 210-4349
Replace a load-tested failed alternator on the ninth-generation L4 branch Fitment/availability: 2013-2017 Accord 2.4L L4 after VIN and charging-system confirmation.
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Sources for this issue (2)
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 Honda?
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 Honda it is documented across 1 model: Accord.
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 Honda?
Published repair estimates on Honda range from $300 to $700 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.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.