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2007 LEXUS LS 460
4.6L V8•RWD•AUTOMATIC•gas
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Repairs0Labor485Torque3372Fluid7DTC1104Battery1Maintenance0Recalls0
U0046high severityNetwork

Vehicle Communication Bus B Off

on 2007 Lexus LS 460 4.6L V8 · RWD

What this code means

CAN bus B is completely offline. No communication on the secondary CAN bus.

Symptoms

  • Secondary systems inoperative
  • Body control functions down
  • Climate control offline
  • Entertainment system not communicating

Common causes

  • CAN bus B wiring shorted or open
  • Bus B termination resistor failure
  • Module pulling down bus B
  • Major connector failure

Diagnostic steps

  1. Measure bus B resistance
  2. Check bus B voltage levels
  3. Isolate bus B segments
  4. Inspect bus B connectors

Repair notes

Complete bus B failure requires systematic wiring diagnosis.

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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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