OBD Guide
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U1540

Body Control Module Lost Communication With Right Rear Window Motor On LIN Bus

U1540 is an OBD-II diagnostic trouble code meaning: Body Control Module Lost Communication With Right Rear Window Motor On LIN Bus. Common causes: broken or damaged wires in the lin circuit, right rear window motor malfunction. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • The right rear power window does not work
  • Error indication on the dashboard
  • Intermittent operation of the window regulator
  • Disruption of other systems connected to the LIN bus

Causes

  • Broken or damaged wires in the LIN circuit
  • Right rear window motor malfunction
  • Body Module (BCM) Problems
  • Power window circuit fuse blown
  • Corrosion of contacts in connectors

How to Fix

  1. Check the integrity of the wires in the LIN circuit
  2. Diagnose the right rear window motor
  3. Check the condition of the fuses
  4. Inspect connector contacts for corrosion
  5. Reset Body Module (BCM)

Related codes

U1541U1542U1543

FAQ

What does the U1540 code mean?

U1540 is an OBD-II diagnostic trouble code that indicates: Body Control Module Lost Communication With Right Rear Window Motor On LIN Bus

What causes a U1540 error code?

The most common causes of U1540 include: Broken or damaged wires in the LIN circuit; Right rear window motor malfunction; Body Module (BCM) Problems; Power window circuit fuse blown.

How do I fix a U1540 diagnostic trouble code?

To fix U1540: Check the integrity of the wires in the LIN circuit. Diagnose the right rear window motor. Check the condition of the fuses. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1540?

Yes, but get it checked soon

How much does it cost to fix U1540?

The estimated repair cost for U1540 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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