OBD Guide
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U018A

Lost Communication With Headlamp Leveling Control Module B

U018A is an OBD-II diagnostic trouble code meaning: Lost Communication With Headlamp Leveling Control Module B. Common causes: open or short circuit in the module power supply circuit, damage to the wiring harness to the headlight adjustment module. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • Error message on the dashboard
  • Automatic headlight leveling does not work
  • Headlights may not be aimed correctly
  • Flashing or unstable headlights
  • Warning light on instrument panel

Causes

  • Open or short circuit in the module power supply circuit
  • Damage to the wiring harness to the headlight adjustment module
  • Malfunction of headlight leveling module B
  • Connector problems or contact corrosion
  • Failures in the control unit software

How to Fix

  1. Check fuses associated with the headlight system
  2. Inspect the wiring harness and connectors of the adjustment module
  3. Check power and ground on the headlight adjustment module
  4. Scan the module for additional errors
  5. If necessary, replace headlight leveling module B

Related codes

U0189U018BU0188

Error U018A by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the U018A code mean?

U018A is an OBD-II diagnostic trouble code that indicates: Lost Communication With Headlamp Leveling Control Module B

What causes a U018A error code?

The most common causes of U018A include: Open or short circuit in the module power supply circuit; Damage to the wiring harness to the headlight adjustment module; Malfunction of headlight leveling module B; Connector problems or contact corrosion.

How do I fix a U018A diagnostic trouble code?

To fix U018A: Check fuses associated with the headlight system. Inspect the wiring harness and connectors of the adjustment module. Check power and ground on the headlight adjustment module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U018A?

Limited driving only, diagnose soon

How much does it cost to fix U018A?

The estimated repair cost for U018A is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat