OBD Guide
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B3984

Device 1 Environment Identifier Not Programmable

B3984 is an OBD-II diagnostic trouble code meaning: Device 1 Environment Identifier Not Programmable. Common causes: control module malfunction, wiring harness damage. Estimated repair cost: $56–167.

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

Symptoms

  • Incorrect operation of electronic systems
  • Check Engine Light Illuminates
  • Reduced engine performance

Causes

  • Control module malfunction
  • Wiring harness damage
  • Software error

How to Fix

  1. Check the wiring harness for damage
  2. Scan your system for other errors
  3. Try reprogramming the control module
  4. If necessary, replace the control module

Related codes

B3985B3986

Error B3984 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the B3984 code mean?

B3984 is an OBD-II diagnostic trouble code that indicates: Device 1 Environment Identifier Not Programmable

What causes a B3984 error code?

The most common causes of B3984 include: Control module malfunction; Wiring harness damage; Software error.

How do I fix a B3984 diagnostic trouble code?

To fix B3984: Check the wiring harness for damage. Scan your system for other errors. Try reprogramming the control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B3984?

Limited driving only, diagnose soon

How much does it cost to fix B3984?

The estimated repair cost for B3984 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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