OBD Guide
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U1531

Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Left Headlamp Assembly On LIN Bus

U1531 is an OBD-II diagnostic trouble code meaning: Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Left Headlamp Assembly On LIN Bus. Common causes: broken or damaged lin bus wires, malfunction of the headlight control module. Estimated repair cost: $33–167.

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

Symptoms

  • The left headlight does not turn on or does not work correctly
  • Headlight leveling system does not function
  • Error message on the dashboard
  • Flickering or unstable headlight operation

Causes

  • Broken or damaged LIN bus wires
  • Malfunction of the headlight control module
  • Problems with the left headlight (internal faults)
  • Corroded contacts or poor connection
  • Problems with power supply to the headlight or module

How to Fix

  1. Check the integrity of the wires and connections of the LIN bus
  2. Inspect contacts for corrosion or damage
  3. Check the power and ground of the headlight and control module
  4. Diagnose the operation of the leftmost headlight
  5. If necessary, replace the control module or headlight

Related codes

U1532U1530B1531

FAQ

What does the U1531 code mean?

U1531 is an OBD-II diagnostic trouble code that indicates: Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Left Headlamp Assembly On LIN Bus

What causes a U1531 error code?

The most common causes of U1531 include: Broken or damaged LIN bus wires; Malfunction of the headlight control module; Problems with the left headlight (internal faults); Corroded contacts or poor connection.

How do I fix a U1531 diagnostic trouble code?

To fix U1531: Check the integrity of the wires and connections of the LIN bus. Inspect contacts for corrosion or damage. Check the power and ground of the headlight and control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1531?

Limited driving only, diagnose soon

How much does it cost to fix U1531?

The estimated repair cost for U1531 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat