OBD Guide
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B3109

Keyless Entry Transmitter 1 Battery

B3109 is an OBD-II diagnostic trouble code meaning: Keyless Entry Transmitter 1 Battery. Common causes: low battery key fob, key fob malfunction. Estimated repair cost: $6–17.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–17 (est.)

Symptoms

  • Increased remote control distance
  • Unstable operation of the remote control
  • Complete failure of the key fob

Causes

  • Low battery key fob
  • Key fob malfunction
  • Receiver antenna problems

How to Fix

  1. Check and replace the battery in the key fob
  2. Test the key fob after replacing the battery
  3. Check the operation of the receiver antenna if necessary

Related codes

B3108B3110

Error B3109 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the B3109 code mean?

B3109 is an OBD-II diagnostic trouble code that indicates: Keyless Entry Transmitter 1 Battery

What causes a B3109 error code?

The most common causes of B3109 include: Low battery key fob; Key fob malfunction; Receiver antenna problems.

How do I fix a B3109 diagnostic trouble code?

To fix B3109: Check and replace the battery in the key fob. Test the key fob after replacing the battery. Check the operation of the receiver antenna if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B3109?

Yes, but get it checked soon

How much does it cost to fix B3109?

The estimated repair cost for B3109 is $6–17. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat