Exterior Lighting Bus Communication Error
The B0092 code means the vehicle's onboard diagnostic system has detected: Exterior Lighting Bus Communication Error. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $100 - $500 (parts and labor)
Basic scanners skip body codes entirely. BlueDriver reads airbag, HVAC, lighting, and BCM codes through your phone.
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Common Symptoms
- Multiple exterior lights malfunctioning
- Lighting warnings on dashboard
- Exterior lights flickering erratically
- Random light failures
Probable Causes (Ranked by Likelihood)
- Faulty LIN bus to lighting module Very High
- Corroded bus wiring connector High
- Failed lighting control module Moderate
- BCM communication output failure Low
Step-by-Step Diagnostic Procedure
-
Scan for LIN bus DTCs
-
Check module connectors
-
Test LIN bus signal integrity
-
Inspect BCM-to-module wiring
Frequently Asked Questions
What is a lighting bus?
A LIN serial communication system for controlling each light individually with fewer wires.
Can one bad connection affect multiple lights?
Yes, the LIN bus is daisy-chained.
Is this common on European vehicles?
Yes, they more commonly use LIN bus lighting control.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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