OBD Guide
ENFRDEESPT

U01A4

Lost Communication With Hybrid/EV Battery Interface Control Module E

U01A4 is an OBD-II diagnostic trouble code meaning: Lost Communication With Hybrid/EV Battery Interface Control Module E. Common causes: can bus break or damage, problems with power supply to the battery management module. Estimated repair cost: $167–556.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$167–556 (est.)

Symptoms

  • Check Engine light comes on
  • Loss of engine power
  • The car goes into emergency mode
  • Cannot charge high voltage battery
  • Error message on the dashboard

Causes

  • CAN bus break or damage
  • Problems with power supply to the battery management module
  • Malfunction of the battery management module itself
  • Corrosion or poor contact in connectors
  • Software error in one of the modules

How to Fix

  1. Check the integrity of the CAN bus and connections between modules
  2. Check power and grounding of the battery management module
  3. Scan all modules for additional error codes
  4. Diagnose the battery control module
  5. If necessary, replace the battery management module
  6. Repair only from an authorized dealer

Related codes

U01A0U01A1U01A2

Error U01A4 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the U01A4 code mean?

U01A4 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Hybrid/EV Battery Interface Control Module E

What causes a U01A4 error code?

The most common causes of U01A4 include: CAN bus break or damage; Problems with power supply to the battery management module; Malfunction of the battery management module itself; Corrosion or poor contact in connectors.

How do I fix a U01A4 diagnostic trouble code?

To fix U01A4: Check the integrity of the CAN bus and connections between modules. Check power and grounding of the battery management module. Scan all modules for additional error codes. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U01A4?

Do not drive — repair immediately

How much does it cost to fix U01A4?

The estimated repair cost for U01A4 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat