P0563 The computer sees system voltage that is too high

System voltage high

Severity not verified — if the car runs badly, have it inspected

The sources sampled define the code but do not rate how urgent it is. A battery or charging fault can leave the car stalling or unable to restart, so have it tested soon.

Source: how we rate severity

P0563 in short

P0563 means the engine computer sees system voltage that is too high. A faulty alternator or voltage regulator is the usual cause, and bad connections or grounds can also set it. Overcharging can damage the battery, so have the charging system tested soon.

P0563 is titled System Voltage High in the Delaware DMV list. TroubleCodes.net describes it as an unexpected voltage on the computer's power circuit from the charging system or battery.

Its listed causes include a defective battery or alternator, voltage regulator failure, damaged or corroded wiring, poor grounds and faulty aftermarket accessories. Overcharging can ruin a battery, which is why testing should not wait long.

Most likely causes

These are general causes for this code across vehicles. None is specific to one make or model.

  1. Alternator or voltage regulator fault, or a bad battery

    Common general cause
    Why it ranks here
    TroubleCodes.net lists a defective battery or alternator and voltage regulator failure first, and the charging system sets the voltage the computer reads.
    What would change this
    Rises if charging voltage at idle is above the normal range. Falls if charging voltage is normal.

  2. Corroded or loose battery terminals, damaged wiring or poor grounds

    Common general cause
    Why it ranks here
    Bad connections add resistance or open the computer's power supply, so it reads the wrong voltage even when the battery and alternator are fine.
    What would change this
    Rises if terminals are corroded or a voltage-drop test shows a bad cable or ground. Falls if connections are clean and tight.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read all stored codes and freeze-frame data with a scan tool, and note any other voltage or charging codes.

    Low riskTool: OBD-II scan tool

    • IfOther charging or battery codes are stored

      It meansWork on the charging system first.

      Go to step 2

    • IfThis is the only code

      It meansTest the battery next.

      Go to step 2

  2. Look at the battery terminals for corrosion and looseness, then have the battery load-tested. Many parts stores do this.

    Low riskTool: digital multimeter or battery tester

  3. With the engine idling, measure voltage at the battery posts and compare with the normal charging range.

    Use cautionTool: digital multimeter

    Warning:The engine is running. Keep hands, hair, clothing and test leads clear of the belt and cooling fan.

Symptoms

  • Check engine light on
  • Battery failure from overcharging
  • Engine stalling
  • Erratic automatic transmission shifting

How to fix

On your vehicle

Chevrolet

  • 2024 · Silverado 2500 HD

    Supported by vehicle data

    GM bulletin 24-NA-050 covers Silverado and Sierra vehicles setting P0606 and either P0562 or P0563. Whether it is still current is not verified.

  • 2024 · Silverado 3500 HD

    Supported by vehicle data

    GM bulletin 24-NA-050 covers Silverado and Sierra vehicles setting P0606 and either P0562 or P0563. Whether it is still current is not verified.

  • 24-NA-050-chevroletStatus unverified

    Silverado and Sierra setting P0606 and P0562 or P0563

    2024silverado-2500-hd, silverado-3500-hd · issued · NHTSA 11013257

    GM technical bulletin on repair information for Silverado and Sierra vehicles that set P0606 and either P0562 or P0563. Only the NHTSA summary was read.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

GMC

  • 2024 · Sierra 2500 HD

    Supported by vehicle data

    GM bulletin 24-NA-050 covers Silverado and Sierra vehicles setting P0606 and either P0562 or P0563. Whether it is still current is not verified.

  • 24-NA-050-gmcStatus unverified

    Silverado and Sierra setting P0606 and P0562 or P0563

    2024sierra-2500-hd, sierra-3500-hd · issued · NHTSA 11013257

    GMC listing of the GM technical bulletin on repair information for Silverado and Sierra vehicles that set P0606 and either P0562 or P0563. Only the NHTSA summary was read.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Jeep

  • 2022 · Wrangler

    Supported by vehicle data

    Jeep flash bulletin 0817023 covers hybrid control processor updates for a check engine light with P0563 (system voltage high) among other codes. Whether it is still current is not verified.

  • 0817023Status unverified

    Hybrid control processor flash for P0563 and P2B28

    2022wrangler · issued · NHTSA 10242799

    Jeep flash bulletin about hybrid control processor updates for a check engine light with codes including P0563 (system voltage high) and P2B28. Only the NHTSA summary was read.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Ram

  • 2022 · 1500

    Supported by vehicle data

    Ram flash bulletin 0816622 covers a hybrid control processor software update for a check engine and/or battery charge warning light with P0563. Whether it is still current is not verified.

  • 0816622Status unverified

    Hybrid control processor flash for check engine and charge warning lights

    20221500 · issued · NHTSA 10229579

    Ram flash bulletin about updating the hybrid control processor software for a check engine light and/or battery charge warning light, with P0563 among the codes. Only the NHTSA summary was read.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Hyundai

  • 1999 · Accent

    Supported by vehicle data

    Hyundai bulletin 0036007 says some vehicles may show the SRS light with B1111 and P0563 (system voltage high) stored in the ECM. Whether it is still current is not verified.

  • 0036007Status unverified

    SRS light with B1111 and P0563 (high battery voltage)

    1999accent · issued · NHTSA 613467

    Hyundai bulletin saying some vehicles may show the SRS light with B1111 (battery voltage high) stored, headlamps that get very bright and return to normal or stop working, and P0563 (system voltage high) in the ECM. Only the NHTSA summary was read.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

No curated relationships for P0563 yet.

All Charging and starting codes

P0563 questions

Can P0563 damage the battery?

TroubleCodes.net lists battery failure from overcharging among the symptoms, so have the charging system tested soon.

Sources and review

  1. On-Board Diagnostic Trouble Codes (generic code title list) — Delaware Division of Motor Vehicles
  2. P0563 diagnostic trouble code page — TroubleCodes.net
  3. 24-NA-050: Silverado and Sierra setting P0606 and P0562 or P0563 — Chevrolet
  4. 24-NA-050: Silverado and Sierra setting P0606 and P0562 or P0563 — Gmc
  5. 0817023: Hybrid control processor flash for P0563 and P2B28 — Jeep
  6. 0816622: Hybrid control processor flash for check engine and charge warning lights — Ram
  7. 0036007: SRS light with B1111 and P0563 (high battery voltage) — Hyundai
Last reviewed
Written by
Saurabh K.
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