OBD Guide
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C0109

Power Supply Voltage Failure

C0109 is an OBD-II diagnostic trouble code meaning: Power Supply Voltage Failure. Common causes: battery fault, problems with the generator. Estimated repair cost: $56–167.

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

Symptoms

  • ABS light is on
  • ABS system does not work
  • Unstable operation of the brake system

Causes

  • Battery fault
  • Problems with the generator
  • Broken or damaged wiring harness
  • Contact corrosion

How to Fix

  1. Check battery voltage
  2. Check generator operation
  3. Inspect the wiring harness for damage
  4. Check contacts for corrosion

Related codes

C0110C0111

Error C0109 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the C0109 code mean?

C0109 is an OBD-II diagnostic trouble code that indicates: Power Supply Voltage Failure

What causes a C0109 error code?

The most common causes of C0109 include: Battery fault; Problems with the generator; Broken or damaged wiring harness; Contact corrosion.

How do I fix a C0109 diagnostic trouble code?

To fix C0109: Check battery voltage. Check generator operation. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C0109?

Limited driving only, diagnose soon

How much does it cost to fix C0109?

The estimated repair cost for C0109 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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