OBD Guide
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B3921

Group 2 Seat Motors Circuit Shorted

B3921 is an OBD-II diagnostic trouble code meaning: Group 2 Seat Motors Circuit Shorted. Common causes: wiring harness damage, seat motor malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Group 2 seat adjustment does not work
  • Burnt smell coming from under the seat
  • Fuses blow

Causes

  • Wiring harness damage
  • Seat motor malfunction
  • Short circuit in the control unit
  • Contact corrosion

How to Fix

  1. Check wiring harness for damage
  2. Test seat motors
  3. Inspect the control unit for short circuits
  4. Replace damaged components

Related codes

B3920B3922B3910

Error B3921 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the B3921 code mean?

B3921 is an OBD-II diagnostic trouble code that indicates: Group 2 Seat Motors Circuit Shorted

What causes a B3921 error code?

The most common causes of B3921 include: Wiring harness damage; Seat motor malfunction; Short circuit in the control unit; Contact corrosion.

How do I fix a B3921 diagnostic trouble code?

To fix B3921: Check wiring harness for damage. Test seat motors. Inspect the control unit for short circuits. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B3921?

Limited driving only, diagnose soon

How much does it cost to fix B3921?

The estimated repair cost for B3921 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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