OBD Guide
ENFRDEESPT

U01AB

Lost Communication With Hybrid/EV Battery Interface Control Module L

U01AB is an OBD-II diagnostic trouble code meaning: Lost Communication With Hybrid/EV Battery Interface Control Module L. Common causes: broken or damaged can bus wires, poor contact in battery control module connectors. 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
  • The car goes into emergency mode
  • Reduced power or inability to use electric mode
  • Incorrect battery level display
  • Errors in other systems related to the hybrid installation

Causes

  • Broken or damaged CAN bus wires
  • Poor contact in battery control module connectors
  • Battery management module malfunction
  • Problems with module power supply (blown fuse)
  • Software error in control module

How to Fix

  1. Check the integrity of the CAN bus and connections
  2. Inspect the connectors and wires of the battery control module
  3. Check fuses associated with the system
  4. Scan the module for additional errors
  5. If necessary, replace or reflash the control module
  6. Repair only from an authorized dealer

Related codes

U01AAU01ACU0100

Error U01AB by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the U01AB code mean?

U01AB is an OBD-II diagnostic trouble code that indicates: Lost Communication With Hybrid/EV Battery Interface Control Module L

What causes a U01AB error code?

The most common causes of U01AB include: Broken or damaged CAN bus wires; Poor contact in battery control module connectors; Battery management module malfunction; Problems with module power supply (blown fuse).

How do I fix a U01AB diagnostic trouble code?

To fix U01AB: Check the integrity of the CAN bus and connections. Inspect the connectors and wires of the battery control module. Check fuses associated with the system. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U01AB?

Do not drive — repair immediately

How much does it cost to fix U01AB?

The estimated repair cost for U01AB is $167–556. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat