OBD Guide
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U04A1

Invalid Data Received From Hybrid/EV Battery Interface Control Module A

U04A1 is an OBD-II diagnostic trouble code meaning: Invalid Data Received From Hybrid/EV Battery Interface Control Module A. Common causes: battery management module malfunction, damaged wiring harness or connectors. Estimated repair cost: $56–278.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Check Engine light comes on
  • Hybrid system power reduction
  • Incorrect battery level display
  • The vehicle goes into emergency mode
  • Errors in the operation of the regenerative braking system

Causes

  • Battery management module malfunction
  • Damaged wiring harness or connectors
  • Problems with the CAN bus (interference, break)
  • Software error in battery module
  • Corrosion of contacts in the communication circuit

How to Fix

  1. Carry out diagnostics of the CAN bus for communication errors
  2. Check the integrity of the wiring harness and battery module connectors
  3. Read error codes from the battery module to determine the problem
  4. If necessary, update the module software
  5. Repair only from an authorized dealer

Related codes

U04A0U04A2U04A3

Error U04A1 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the U04A1 code mean?

U04A1 is an OBD-II diagnostic trouble code that indicates: Invalid Data Received From Hybrid/EV Battery Interface Control Module A

What causes a U04A1 error code?

The most common causes of U04A1 include: Battery management module malfunction; Damaged wiring harness or connectors; Problems with the CAN bus (interference, break); Software error in battery module.

How do I fix a U04A1 diagnostic trouble code?

To fix U04A1: Carry out diagnostics of the CAN bus for communication errors. Check the integrity of the wiring harness and battery module connectors. Read error codes from the battery module to determine the problem. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U04A1?

Limited driving only, diagnose soon

How much does it cost to fix U04A1?

The estimated repair cost for U04A1 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat