Interior Dome Light Circuit Malfunction
What does B0055 mean?
The B0055 code means the vehicle's onboard diagnostic system has detected: Interior Dome Light Circuit Malfunction. This is a low severity code.
Common Symptoms
- Dome light does not turn on when doors open
- Interior light stays on constantly
- Dome light flickers intermittently
- Battery draining from dome light staying on
- Interior light switch has no effect
Probable Causes (Ranked by Likelihood)
- Burned out dome light bulb Very High
- Faulty door jamb switch High
- Body control module interior light output fault Moderate
- Wiring short or open in dome light circuit Low
Step-by-Step Diagnostic Procedure
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Check dome light bulb for failure
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Test door jamb switches with scan tool or manually
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Verify dome light switch positions and operation
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Check body control module for interior light DTCs
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Inspect wiring at dome light fixture and door jambs
Frequently Asked Questions
Can a stuck dome light drain my battery?
Yes. If the dome light stays on due to a faulty door switch or wiring issue, it can drain the battery overnight, especially if the vehicle sits for an extended period.
What is a door jamb switch?
It is a small push-button switch mounted in the door frame that detects whether the door is open or closed. When the door opens, the switch triggers the dome light to turn on.
Why does my dome light stay on after I close the door?
Many vehicles have a timed delay that keeps the dome light on for 20-30 seconds after closing the door. If it stays on much longer, a faulty door switch or BCM issue is likely.