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Home / DTC / B297B — Trunklid cylinder open:OP cycle

B297B — Trunklid cylinder open:OP cycle

Detailed page for trouble code B297B.

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Code

B297B

MITSUBISHI B — Body

Trunklid cylinder open:OP cycle

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

Causes

  • Damaged or stuck trunk lid cylinder/actuator
  • Failed open/position switch or sensor
  • Broken, corroded or disconnected wiring/connectors to actuator or sensor
  • Blown fuse or poor battery/ground connection
  • Mechanical obstruction or binding in hinge/latch mechanism
  • Control module or software fault

Symptoms

  • Trunk lid does not fully open when activated by switch or keyfob
  • Trunk lid opens slowly or intermittently stops during opening
  • Control module stores B297B and may inhibit further open commands
  • Possible clicking or motor noise at actuator that does not result in full travel
  • Trunk position indicator inaccurate or not updating

What to check

  • Attempt to reproduce failure and note conditions (cold start, after rain, with remote/manual)
  • Scan vehicle memory for B297B and any related codes; record freeze frame data
  • Visually inspect trunk lid actuator, wiring harness, connectors, and open/position switch for damage, corrosion or water intrusion
  • Check battery voltage and ground integrity while attempting an open cycle
  • Operate trunk open command while observing actuator: listen for motor, feel for movement, and note time to reach open position

Signal parameters

  • Trunk open command (switch/keyfob) — expected to trigger actuator power
  • Actuator supply voltage during open command (approx. battery voltage ~12V)
  • Motor current draw during operation (spike when motor starts, steady during travel)
  • Open/position switch signal state change when trunk reaches fully open
  • Time/duration from command to open-position switch activation (should be within expected cycle time)

Diagnostic algorithm

  1. Reproduce the fault and clear the code, then attempt open cycle while monitoring for recurrence.
  2. Inspect connectors and wiring at trunk actuator and position switch; repair any corrosion, pin damage or loose terminals.
  3. With a multimeter, check for battery voltage at the actuator power feed while operating the open command. If no voltage, trace back to fuse/relay and control module output.
  4. Measure motor current when commanding open; no current suggests open circuit or failed motor, excessive current indicates mechanical bind.
  5. Verify the open-position switch changes state when trunk is physically moved to open position. Adjust or replace switch if it does not change reliably.
  6. Inspect hinge/latch and cylinder for binding, damage or debris; lubricate or repair mechanical interference.
  7. If wiring and actuator test good but code persists, check for control module faults or software updates and consult manufacturer service information before replacing modules.
  8. After repairs, clear codes and perform multiple open/close cycles to confirm proper operation and that B297B does not return.

Likely causes

  • Actuator motor not receiving power during open command
  • Open-position switch not changing state (failed or misaligned)
  • Connector corrosion or broken wire in harness to trunk actuator
  • Physical obstruction preventing full travel of the trunk lid
  • Intermittent ground or low battery voltage causing incomplete cycle

Fault status

⚠️ Status
Trunklid cylinder open: OP cycle — open operation did not complete or open-position signal not detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B297A B297C B1240 B2100 U0121
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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