OBD Guide
ENFRDEESPT

B3A40

Active Aerodynamic Feature B Actuator Temperature Not Plausible

B3A40 is an OBD-II diagnostic trouble code meaning: Active Aerodynamic Feature B Actuator Temperature Not Plausible. Common causes: actuator overheating, damage to the actuator temperature sensor. Estimated repair cost: $111–556.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$111–556 (est.)

Symptoms

  • Disabling active aerodynamics
  • Error message on the instrument panel
  • Limitation of active spoiler/deflector functions
  • Unstable operation of aerodynamic elements at high speeds

Causes

  • Actuator overheating
  • Damage to the actuator temperature sensor
  • Open or shorted wiring harness
  • Malfunction of the active aerodynamics control unit
  • Mechanical damage to the drive (jamming, wear)

How to Fix

  1. Diagnostics of the active aerodynamics system using a scanner
  2. Checking the temperature of the Gray_mechanism executive in real time
  3. Inspect the wiring harness and connectors for damage
  4. Checking the integrity of the actuator temperature sensor
  5. Checking the operation of solenoids and electric motors
  6. Replacement of faulty components (if necessary)
  7. Resetting the error and testing the system

Related codes

B3A41B3A42U0100

Error B3A40 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the B3A40 code mean?

B3A40 is an OBD-II diagnostic trouble code that indicates: Active Aerodynamic Feature B Actuator Temperature Not Plausible

What causes a B3A40 error code?

The most common causes of B3A40 include: Actuator overheating; Damage to the actuator temperature sensor; Open or shorted wiring harness; Malfunction of the active aerodynamics control unit.

How do I fix a B3A40 diagnostic trouble code?

To fix B3A40: Diagnostics of the active aerodynamics system using a scanner. Checking the temperature of the Gray_mechanism executive in real time. Inspect the wiring harness and connectors for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B3A40?

Limited driving only, diagnose soon

How much does it cost to fix B3A40?

The estimated repair cost for B3A40 is $111–556. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat