OBD Guide
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P05B7

Active Grille Air Shutter B Supply Voltage Circuit High

P05B7 is an OBD-II diagnostic trouble code meaning: Active Grille Air Shutter B Supply Voltage Circuit High. Common causes: faulty generator voltage regulator (main cause), voltage surge when starting from an external battery.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately

Symptoms

  • Check Engine Light and Possibly Other Lights
  • Bright burning of incandescent lamps
  • Related codes for other systems (overvoltage)
  • Fuses or components may fail
  • Rapid consumption of battery electrolyte

Causes

  • Faulty generator voltage regulator (main cause)
  • Voltage surge when starting from an external battery
  • Incorrect charger connection
  • Relay malfunction in the blinds power circuit
  • Short circuit in the power circuit, creating overvoltage in the area

How to Fix

  1. Immediately check the voltage of the on-board network with the engine running (the norm is up to 14.7 V)
  2. If the voltage is higher than 15 V, immediately check the generator and voltage regulator
  3. Diagnose the generator with an oscilloscope or load tester
  4. Check the power supply circuit of the blinds for incorrect connections.
  5. If the mains voltage is normal, check the blinds power relay
  6. Replace faulty generator/regulator or relay

Related codes

P05B5P05B6P05B3P0562P0563

Error P05B7 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P05B7 code mean?

P05B7 is an OBD-II diagnostic trouble code that indicates: Active Grille Air Shutter B Supply Voltage Circuit High

What causes a P05B7 error code?

The most common causes of P05B7 include: Faulty generator voltage regulator (main cause); Voltage surge when starting from an external battery; Incorrect charger connection; Relay malfunction in the blinds power circuit.

How do I fix a P05B7 diagnostic trouble code?

To fix P05B7: Immediately check the voltage of the on-board network with the engine running (the norm is up to 14.7 V). If the voltage is higher than 15 V, immediately check the generator and voltage regulator. Diagnose the generator with an oscilloscope or load tester. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P05B7?

Do not drive — repair immediately

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See also: Russian version · NationStat