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Home / DTC / B298D — Trunklid cylinder close:CL cycle

B298D — Trunklid cylinder close:CL cycle

Detailed page for trouble code B298D.

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Code

B298D

MITSUBISHI B — Body

Trunklid cylinder close:CL cycle

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty trunklid power cylinder / actuator (electrical or mechanical failure)
  • Trunk/tailgate latch or striker misalignment or binding
  • Obstruction in trunk path or worn hinges/guide rails
  • Faulty position or limit switch (open/closed sensor) or striker sensor
  • Wiring fault: open, short to power/ground, damaged connector or corrosion
  • Blown fuse or failed relay in the tailgate power circuit

Symptoms

  • Automatic trunk/tailgate will not complete close cycle or stops mid-travel
  • Repeated attempts to close or audible click/relay chatter
  • Trunk warning message or chime on dash
  • Trunk may stay partially open or fail to latch
  • Intermittent operation or operation only by manual force

What to check

  • Verify customer complaint and attempt to reproduce the fault (note conditions and number of attempts)
  • Check for additional DTCs in body/control modules and record freeze-frame data
  • Inspect trunk area for physical obstructions, damaged hinges, or misaligned latch/striker
  • Visually inspect wiring, connectors, and ground points at the actuator and latch
  • Check fuses and relays for the trunk/tailgate power circuit
  • Operate trunk while observing actuator behavior and listening for abnormal noises

Signal parameters

  • Command voltage: ECU typically applies 0–12 V to the actuator motor depending on direction; expect near battery voltage when commanded
  • Quiescent voltage: when idle, actuator circuit should show no drive voltage
  • Current draw: during travel motor current typically rises; expected range depends on actuator but often ~0.5–6 A under normal load (large sustained spikes indicate mechanical binding)
  • Position/limit switch: binary open/closed signal change when fully closed (verify with scan tool or meter)
  • Cycle time: close cycle should complete within manufacturer-specified time; significantly longer or incomplete cycle indicates a problem

Diagnostic algorithm

  1. Reproduce fault and note symptoms, number of cycles, ambient temperature, and any messages.
  2. Read and record all related DTCs and freeze-frame data from body/control modules; clear codes and attempt one controlled close cycle while monitoring.
  3. Visually inspect trunk, latch, striker, hinges, and actuator for damage, corrosion, or obstruction. Manually cycle trunk to check binding or abnormal resistance.
  4. Inspect fuses and relays for the trunk/tailgate circuit; replace if suspect and retest.
  5. Inspect wiring and connectors at actuator and latch for corrosion, broken wires, or poor crimps. Wiggle-test while commanding close to check for intermittent faults.
  6. Using a DVOM or oscilloscope and the scan tool, command the close cycle and measure: drive voltage to the actuator, ground continuity, and actuator current. Compare to expected ranges.
  7. Check position/limit switch signals with scan tool or meter during the close cycle; verify the switch changes state at full close.
  8. If actuator receives correct drive and shows normal current but trunk does not close, investigate mechanical linkage/latch. If actuator does not move or draws excessive current, remove and bench-test actuator to confirm functionality.
  9. If actuator is functional and wiring/controls are correct but code persists, consider replacing the latch/position sensor or the trunk/body control module and verify software updates are current.
  10. After any repair, clear codes and perform multiple open/close cycles to confirm correct operation and that the DTC does not return.

Likely causes

  • Defective actuator (most common)
  • Faulty trunk close switch or latch sensor giving incorrect feedback
  • Mechanical blockage preventing full travel
  • Wiring/connectors at actuator or latch corroded or disconnected
  • ECU output driver fault (less common)

Fault status

⚠️ Status
Trunklid cylinder close cycle malfunction detected — actuator did not complete close sequence or position feedback inconsistent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

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406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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