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DTC codes / B02xx · Airbags, seats, doors, lights and comfort systems / B0274

B0274Trunk Lid Release Switch Circuit

B0274 indicates that the body control module (BCM) has detected an abnormal condition in the trunk lid release switch circuit, which typically means the switch is stuck, the wiring is open or shorted, or the BCM is not receiving the expected voltage signal when the switch is pressed. The BCM sets this code when the voltage on the switch signal circuit falls outside the normal range for a calibrated period, often disabling the power trunk release function.

SystemBody
Code typeGeneric (all makes)
SeverityLow
Fix difficultyIntermediate
AreaAirbags, seats, doors, lights and comfort systems

Symptoms you may notice

  • The trunk lid release button inside the cabin or on the key fob does not open the trunk.
  • The trunk may open intermittently or only when the switch is pressed multiple times.
  • A warning light or message on the dashboard indicating a body system fault.
  • The trunk release switch may feel loose or unresponsive when pressed.
  • Often no symptoms besides the warning light, especially if the fault is intermittent.

Common causes, most likely first

  1. Faulty trunk lid release switch (internal contact wear or contamination).
  2. Open or shorted wiring in the trunk lid release switch circuit (commonly at the hinge or grommet).
  3. Corroded or disconnected electrical connector at the switch or BCM.
  4. Blown fuse or faulty relay supplying power to the trunk release circuit.
  5. Water intrusion into the switch or connector causing corrosion.
  6. Failed body control module (BCM) or trunk release module (less common).

How to diagnose and fix it

  1. Verify the fault by pressing the trunk release switch and listening for the relay or actuator; check if the trunk opens manually with the key.
  2. Inspect the trunk release switch for physical damage, contamination, or sticking, and test its continuity with a multimeter.
  3. Check the fuse and relay associated with the trunk release circuit, replacing any blown fuse or faulty relay.
  4. Disconnect the switch connector and inspect for corrosion, water intrusion, or loose pins; clean or repair as needed.
  5. Measure voltage and resistance on the switch signal circuit at the BCM connector to check for open or short circuits, repairing wiring as necessary.
  6. If wiring and switch test good, substitute a known-good BCM or reprogram the existing module as per manufacturer procedures.
  7. Clear the code and test the trunk release operation multiple times to confirm the repair.

Before you replace the trunk release switch

  • A common oversight is assuming the switch is bad when the real problem is a broken wire in the flexible harness that runs from the body to the trunk lid, which flexes every time the trunk opens.
  • Water often collects in the trunk release switch or connector, causing intermittent faults that disappear in dry weather, so always check for moisture damage before condemning parts.
  • The BCM may set B0274 even when the trunk release works perfectly, if the switch signal is out of range only under certain conditions such as extreme temperatures or vibration.
  • Some vehicles use a trunk release switch that is part of a larger multi-function switch assembly, and a fault in an unrelated function can trigger this code.
  • A weak or failing battery can cause the BCM to misread switch inputs, so always verify battery voltage and ground connections before replacing expensive modules.

Can I keep driving with B0274?

The vehicle remains safe to drive because the trunk release is a convenience feature and does not affect engine, braking, or steering operation. Avoid storing valuables in the trunk until the fault is repaired, since the trunk may not open reliably or could open unexpectedly.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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