OBD Guide
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U01AD

Lost Communication With Hybrid/EV Battery Interface Control Module N

U01AD is an OBD-II diagnostic trouble code meaning: Lost Communication With Hybrid/EV Battery Interface Control Module N. Common causes: broken or damaged wires in the can bus, battery management module malfunction. Estimated repair cost: $56–278.

Severity
🚨 Critical
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–278 (est.)

Symptoms

  • Check Engine light comes on
  • The car goes into emergency mode
  • Reduced power or inability to start
  • Errors in the hybrid/electric powertrain system
  • Inability to charge high voltage battery

Causes

  • Broken or damaged wires in the CAN bus
  • Battery management module malfunction
  • Control module power problems
  • Corrosion or poor contact in connectors
  • Software error or need for software update

How to Fix

  1. Check the integrity of the CAN bus and wiring harness
  2. Check power and grounding of the control module
  3. Inspect connectors for corrosion or damage
  4. Diagnose the battery control module
  5. Update software if necessary
  6. Repair only from an authorized dealer

Related codes

U01AEU01AFP0A80

Error U01AD by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the U01AD code mean?

U01AD is an OBD-II diagnostic trouble code that indicates: Lost Communication With Hybrid/EV Battery Interface Control Module N

What causes a U01AD error code?

The most common causes of U01AD include: Broken or damaged wires in the CAN bus; Battery management module malfunction; Control module power problems; Corrosion or poor contact in connectors.

How do I fix a U01AD diagnostic trouble code?

To fix U01AD: Check the integrity of the CAN bus and wiring harness. Check power and grounding of the control module. Inspect connectors for corrosion or damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U01AD?

Do not drive — repair immediately

How much does it cost to fix U01AD?

The estimated repair cost for U01AD is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat