OBD Guide
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P05B3

Active Grille Air Shutter B Control Circuit High

P05B3 is an OBD-II diagnostic trouble code meaning: Active Grille Air Shutter B Control Circuit High. Common causes: short circuit of the control wire to power supply positive (contact with 12 v wiring), internal short circuit in the windings of the blinds actuator.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately

Symptoms

  • Check Engine light on
  • Possible blown shutter circuit fuse
  • Blinds do not respond to control commands
  • Other electrical faults in adjacent circuits
  • The smell of burning insulation (with a significant short circuit)

Causes

  • Short circuit of the control wire to power supply positive (contact with 12 V wiring)
  • Internal short circuit in the windings of the blinds actuator
  • Damage to the harness wiring insulation (chafing against sharp edges)
  • Moisture entering the connector causing the contacts to close
  • ECU output stage malfunction

How to Fix

  1. Read all codes and check if there are parallel codes on other circuits
  2. Disconnect the actuator connector and measure the voltage on the control wire (with the ignition on, the ECU does not activate - it should be ~0 V)
  3. Check the insulation of the harness along its entire length - especially where it passes through metal panels
  4. Measure the resistance of the control wire to the power positive (should be infinite)
  5. Eliminate short circuit: replace the wiring section or isolate the damaged section
  6. Check the integrity of the ECU and fuses

Related codes

P05B1P05B2P05B4P05B5P05B7

Error P05B3 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P05B3 code mean?

P05B3 is an OBD-II diagnostic trouble code that indicates: Active Grille Air Shutter B Control Circuit High

What causes a P05B3 error code?

The most common causes of P05B3 include: Short circuit of the control wire to power supply positive (contact with 12 V wiring); Internal short circuit in the windings of the blinds actuator; Damage to the harness wiring insulation (chafing against sharp edges); Moisture entering the connector causing the contacts to close.

How do I fix a P05B3 diagnostic trouble code?

To fix P05B3: Read all codes and check if there are parallel codes on other circuits. Disconnect the actuator connector and measure the voltage on the control wire (with the ignition on, the ECU does not activate - it should be ~0 V). Check the insulation of the harness along its entire length - especially where it passes through metal panels. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P05B3?

Do not drive — repair immediately

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See also: Russian version · NationStat