OBD Guide
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U0115

Lost Communication With ECM/PCM B

U0115 is an OBD-II diagnostic trouble code meaning: Lost Communication With ECM/PCM B. Common causes: open or short circuit in the can bus circuit, poor contact in ecu connectors. Estimated repair cost: $56–333.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–333 (est.)

Symptoms

  • Engine won't start
  • Engine failures
  • Check Engine Light Is On
  • Power Loss
  • Incorrect dashboard readings

Causes

  • Open or short circuit in the CAN bus circuit
  • Poor contact in ECU connectors
  • Control unit (ECM/PCM) malfunction
  • Problems with module power supply
  • Contact corrosion

How to Fix

  1. Check the integrity of the CAN bus and the condition of the connectors
  2. Diagnose the control unit (ECM/PCM)
  3. Check fuses and relays related to ECU power supply
  4. Clean contacts from corrosion
  5. If necessary, replace damaged ECU

Related codes

U0100U0121U0140

Error U0115 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the U0115 code mean?

U0115 is an OBD-II diagnostic trouble code that indicates: Lost Communication With ECM/PCM B

What causes a U0115 error code?

The most common causes of U0115 include: Open or short circuit in the CAN bus circuit; Poor contact in ECU connectors; Control unit (ECM/PCM) malfunction; Problems with module power supply.

How do I fix a U0115 diagnostic trouble code?

To fix U0115: Check the integrity of the CAN bus and the condition of the connectors. Diagnose the control unit (ECM/PCM). Check fuses and relays related to ECU power supply. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U0115?

Do not drive — repair immediately

How much does it cost to fix U0115?

The estimated repair cost for U0115 is $56–333. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat