OBD Guide
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U0109

Lost Communication With Fuel Pump Control Module A

U0109 is an OBD-II diagnostic trouble code meaning: Lost Communication With Fuel Pump Control Module A. Common causes: open or short circuit in the communication circuit, problems with power supply to the fuel pump control module. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Difficulty starting the engine
  • Unstable engine operation
  • Power Loss
  • Stalling engine
  • Check Engine Light Illuminates

Causes

  • Open or short circuit in the communication circuit
  • Problems with power supply to the fuel pump control module
  • Malfunction of the control module itself
  • Poor contact in connectors
  • Problems with the ECU

How to Fix

  1. Check the integrity of the wiring harness and connectors
  2. Check the power and ground of the control module
  3. Scan the module for additional fault codes
  4. If necessary, replace the fuel pump control module
  5. Check the performance of the ECU

Related codes

U0100U0101U0121

Error U0109 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the U0109 code mean?

U0109 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Fuel Pump Control Module A

What causes a U0109 error code?

The most common causes of U0109 include: Open or short circuit in the communication circuit; Problems with power supply to the fuel pump control module; Malfunction of the control module itself; Poor contact in connectors.

How do I fix a U0109 diagnostic trouble code?

To fix U0109: Check the integrity of the wiring harness and connectors. Check the power and ground of the control module. Scan the module for additional fault codes. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U0109?

Do not drive — repair immediately

How much does it cost to fix U0109?

The estimated repair cost for U0109 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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