OBD Guide
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U154A

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

U154A is an OBD-II diagnostic trouble code meaning: Body Control Module Lost Communication With Right Rear Window Switch On LIN Bus. Common causes: malfunction of the right rear window switch, open or short circuit in the wiring to the switch. Estimated repair cost: $17–89.

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

Symptoms

  • Right rear window regulator does not work
  • Fault indication on the instrument panel
  • Intermittent operation of the window regulator
  • Other electrical faults

Causes

  • Malfunction of the right rear window switch
  • Open or short circuit in the wiring to the switch
  • Body Module (BCM) Problems
  • Damage to the LIN bus
  • Poor contact in connectors

How to Fix

  1. Check right rear window switch
  2. Check the integrity of the wiring to the switch
  3. Check connections and connectors
  4. Check the functionality of the body module
  5. Diagnose LIN bus status

Related codes

U154BU154CU154D

FAQ

What does the U154A code mean?

U154A is an OBD-II diagnostic trouble code that indicates: Body Control Module Lost Communication With Right Rear Window Switch On LIN Bus

What causes a U154A error code?

The most common causes of U154A include: Malfunction of the right rear window switch; Open or short circuit in the wiring to the switch; Body Module (BCM) Problems; Damage to the LIN bus.

How do I fix a U154A diagnostic trouble code?

To fix U154A: Check right rear window switch. Check the integrity of the wiring to the switch. Check connections and connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U154A?

Limited driving only, diagnose soon

How much does it cost to fix U154A?

The estimated repair cost for U154A is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat