Trunk/Liftgate Ajar Circuit Malfunction
What does B1015 mean?
The B1015 code means the vehicle's onboard diagnostic system has detected: Trunk/Liftgate Ajar Circuit Malfunction. This is a low severity code.
Common Symptoms
- Trunk or liftgate ajar warning stays on
- Trunk light stays illuminated
- Dashboard shows trunk open when closed
- Vehicle alarm triggers randomly
- Power liftgate will not operate properly
Probable Causes (Ranked by Likelihood)
- Faulty trunk or liftgate latch switch Very High
- Misaligned trunk lid or liftgate High
- Damaged wiring in trunk lid hinge area Moderate
- Water intrusion into latch mechanism Low
Step-by-Step Diagnostic Procedure
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Check trunk latch switch operation
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Verify trunk lid or liftgate alignment
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Inspect wiring at trunk hinges for broken wires
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Scan BCM for trunk status input
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Check for water damage at latch connector
Frequently Asked Questions
Why does my trunk warning stay on even when the trunk is closed?
The trunk latch has an integrated switch that tells the BCM the trunk is closed. If this switch fails or gets stuck, the system thinks the trunk is still open even when it is latched.
Can a misaligned trunk cause this issue?
Yes. If the trunk lid or liftgate does not fully engage the latch striker due to misalignment, the latch switch may not trigger, causing a persistent ajar warning.
Is this code common on SUVs with power liftgates?
Yes. Power liftgate systems add complexity with additional switches and motors. A failure in the latch switch can cause both the ajar warning and power liftgate malfunction.