OBD Guide
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U1728

Left Headlamp High Beam Control Module Lost Communication With Left Headlamp Leveling Actuator

U1728 is an OBD-II diagnostic trouble code meaning: Left Headlamp High Beam Control Module Lost Communication With Left Headlamp Leveling Actuator. Common causes: broken wires in the harness, oxidation of contacts in the connector. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Left high beam flashing
  • Inability to adjust headlight levels
  • Error message on the dashboard
  • Uneven road lighting

Causes

  • Broken wires in the harness
  • Oxidation of contacts in the connector
  • Level control drive malfunction
  • Problems with the headlight control module
  • CAN bus fault

How to Fix

  1. Check the integrity of the wiring harness
  2. Clean contacts in connectors
  3. Check the power and ground on the adjustment drive
  4. Scan the CAN bus for errors
  5. Replace faulty drive or module if necessary

Related codes

U1727U1729U1730

FAQ

What does the U1728 code mean?

U1728 is an OBD-II diagnostic trouble code that indicates: Left Headlamp High Beam Control Module Lost Communication With Left Headlamp Leveling Actuator

What causes a U1728 error code?

The most common causes of U1728 include: Broken wires in the harness; Oxidation of contacts in the connector; Level control drive malfunction; Problems with the headlight control module.

How do I fix a U1728 diagnostic trouble code?

To fix U1728: Check the integrity of the wiring harness. Clean contacts in connectors. Check the power and ground on the adjustment drive. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1728?

Limited driving only, diagnose soon

How much does it cost to fix U1728?

The estimated repair cost for U1728 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat