OBD Guide
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P05B6

Active Grille Air Shutter B Supply Voltage Circuit Low

P05B6 is an OBD-II diagnostic trouble code meaning: Active Grille Air Shutter B Supply Voltage Circuit Low. Common causes: high contact resistance in the power circuit (oxidized connectors), weak battery or faulty alternator.

Severity
✅ Low
Can you drive?
Do not drive — repair immediately

Symptoms

  • Check Engine light on
  • Unstable or slow operation of blinds
  • The error may appear during startup or during high load on the power grid.
  • Possible related codes for other systems (low voltage on board network)
  • Blinds periodically freeze

Causes

  • High contact resistance in the power circuit (oxidized connectors)
  • Weak battery or faulty alternator
  • Partial break (broken wire with some cores remaining)
  • Voltage drop across power relay
  • Total on-board voltage drop

How to Fix

  1. Check the voltage of the on-board network with the engine running (normal 13.5–14.5 V)
  2. Measure the voltage directly at the power connector of the blinds - compare with the on-board
  3. If the difference is more than 0.5 V, find the source of the voltage drop (wires, relay, fuse)
  4. Check and clean all connectors in the power circuit
  5. Check the condition of the battery and generator
  6. Fix the problem found and check the system operation

Related codes

P05B5P05B7P05B1P05B4

Error P05B6 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P05B6 code mean?

P05B6 is an OBD-II diagnostic trouble code that indicates: Active Grille Air Shutter B Supply Voltage Circuit Low

What causes a P05B6 error code?

The most common causes of P05B6 include: High contact resistance in the power circuit (oxidized connectors); Weak battery or faulty alternator; Partial break (broken wire with some cores remaining); Voltage drop across power relay.

How do I fix a P05B6 diagnostic trouble code?

To fix P05B6: Check the voltage of the on-board network with the engine running (normal 13.5–14.5 V). Measure the voltage directly at the power connector of the blinds - compare with the on-board. If the difference is more than 0.5 V, find the source of the voltage drop (wires, relay, fuse). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P05B6?

Do not drive — repair immediately

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See also: Russian version · NationStat