OBD Guide
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U04A9

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

U04A9 is an OBD-II diagnostic trouble code meaning: Invalid Data Received From Hybrid/EV Battery Interface Control Module I. Common causes: hybrid battery control module malfunction, damage to the interface wiring harness. Estimated repair cost: $167–556.

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

Symptoms

  • The Check Engine or Hybrid light is on
  • The car goes into emergency mode
  • Reduced power or performance
  • Problems charging the hybrid battery
  • Error message on the dashboard

Causes

  • Hybrid battery control module malfunction
  • Damage to the interface wiring harness
  • Control module power problems
  • Corrosion or poor contact in connectors
  • Software error or outdated module software

How to Fix

  1. Hybrid Battery Control Module Diagnostics
  2. Checking the continuity and voltage in the wiring harness
  3. Inspecting and cleaning connector contacts
  4. Module software update
  5. Replacing the control module if necessary
  6. Repair only from an authorized dealer

Related codes

U04A8U04AAU04AB

Error U04A9 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the U04A9 code mean?

U04A9 is an OBD-II diagnostic trouble code that indicates: Invalid Data Received From Hybrid/EV Battery Interface Control Module I

What causes a U04A9 error code?

The most common causes of U04A9 include: Hybrid battery control module malfunction; Damage to the interface wiring harness; Control module power problems; Corrosion or poor contact in connectors.

How do I fix a U04A9 diagnostic trouble code?

To fix U04A9: Hybrid Battery Control Module Diagnostics. Checking the continuity and voltage in the wiring harness. Inspecting and cleaning connector contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U04A9?

Do not drive — repair immediately

How much does it cost to fix U04A9?

The estimated repair cost for U04A9 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat