Exterior Lighting Control Module Failure
The B0093 code means the vehicle's onboard diagnostic system has detected: Exterior Lighting Control Module Failure. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $150 - $600 (parts and labor)
Basic scanners skip body codes entirely. BlueDriver reads airbag, HVAC, lighting, and BCM codes through your phone.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- Multiple exterior lights not working
- Module not responding to BCM
- Exterior light codes in BCM
- Random light behavior
Probable Causes (Ranked by Likelihood)
- Internal module failure Very High
- Water intrusion into module High
- Power supply fault to module Moderate
- BCM software compatibility issue Low
Step-by-Step Diagnostic Procedure
-
Check module power and ground
-
Inspect for water damage
-
Attempt module communication
-
Replace and configure module
Frequently Asked Questions
Can water damage cause failure?
Yes, water on the circuit board causes corrosion and shorts.
Does the new module need programming?
Yes, using dealer-level diagnostic equipment.
Can a failed module drain the battery?
Yes, it can stay awake on the network drawing excessive current.
Sources
This page is built from documented references. Verify against your own service info before repair work.
Explore More
Was this helpful?
Share carcodefinder.com with a friend who needs to decode their check engine light.