OBD Guide
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B0066

Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range

B0066 is an OBD-II diagnostic trouble code meaning: Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range. Common causes: open or short circuit in pretensioner wiring harness, pretensioner squib malfunction. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • SRS (airbag) light is on
  • The pretensioner may not work in an accident.
  • Error B0066 in the diagnostic scanner memory

Causes

  • Open or short circuit in pretensioner wiring harness
  • Pretensioner squib malfunction
  • Corrosion or poor contact in connectors
  • Problems with the SRS control unit
  • Previous activation of the pretensioner (after an accident)

How to Fix

  1. Diagnose the SRS system using a scanner
  2. Check the integrity of the wiring harness to the pretensioner
  3. Inspect connectors and contacts for corrosion
  4. Check the resistance of the pretensioner squib
  5. If necessary, replace the pretensioner or wiring harness.
  6. Reset SRS errors after repair

Related codes

B0065B0067B0070

Error B0066 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the B0066 code mean?

B0066 is an OBD-II diagnostic trouble code that indicates: Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range

What causes a B0066 error code?

The most common causes of B0066 include: Open or short circuit in pretensioner wiring harness; Pretensioner squib malfunction; Corrosion or poor contact in connectors; Problems with the SRS control unit.

How do I fix a B0066 diagnostic trouble code?

To fix B0066: Diagnose the SRS system using a scanner. Check the integrity of the wiring harness to the pretensioner. Inspect connectors and contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B0066?

Do not drive — repair immediately

How much does it cost to fix B0066?

The estimated repair cost for B0066 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat