Center Trunk Light Circuit Malfunction
The B0187 code means the vehicle's onboard diagnostic system has detected: Center Trunk Light Circuit Malfunction. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $5 - $100 (parts and labor)
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Common Symptoms
- Trunk light not illuminating when trunk opens
- No illumination inside trunk
- Trunk light stays on with trunk closed
- Trunk light flickers
Probable Causes (Ranked by Likelihood)
- Burned out trunk light bulb Very High
- Faulty trunk lid switch High
- Corroded trunk light socket Moderate
- Damaged wiring at trunk hinge Low
Step-by-Step Diagnostic Procedure
-
Inspect trunk light bulb
-
Test trunk lid switch
-
Check socket for corrosion
-
Inspect wiring at trunk hinge
Frequently Asked Questions
Does the trunk light have its own switch?
Yes, most use a switch on the trunk latch that detects when the trunk is open.
Can it drain the battery?
If the switch fails and the light stays on, it can slowly drain the battery.
How do I test the trunk switch?
Open and close the trunk while watching the light. Test the switch with a multimeter if needed.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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