Code
B297A
MITSUBISHI
B — Body
Trunklid cylinder open:OP cycle
Views:
UK: 8
EN: 6
RU: 5
AI status
Completed
Completed
100%
Causes
- Stuck or mechanically obstructed trunk lid or striker
- Failed or weak trunk cylinder/actuator (hydraulic or electric)
- Poor electrical supply to actuator (blown fuse, poor ground, wiring damage)
- Faulty trunk position/limit switch or sensor
- Faulty body control module (BCM) or trunk control unit
- Intermittent CAN/bus communication fault between modules
Symptoms
- Trunk does not open or does not complete open cycle
- Intermittent trunk operation (works sometimes)
- Noise from actuator (grinding, high current hum) or no noise at all
- Trunk warning lamp/message on dash (if equipped)
- Manual operation feels stiff or obstructed
What to check
- Check for stored BCM/vehicle body module freeze frame data and related trunk codes
- Visually inspect trunk area for obstructions, damaged struts, hinges, or latch binding
- Inspect actuator connector for corrosion, water ingress, bent pins, or loose terminals
- Check related fuses and relays for continuity and correct operation
- Measure battery voltage at idle and during trunk command (voltage should remain within spec)
- Listen for actuator operation while commanding trunk open/close with a scan tool
Signal parameters
- Actuator supply voltage during command: expected battery voltage (~12V nominal)
- Actuator current draw during operation: within manufacturer spec (watch for spikes or high continuous current)
- Trunk open/closed sensor (limit switch) status: change during travel
- BCM command signal to actuator (on/off or PWM) when trunk is commanded
- CAN/BUS messages related to trunk status (presence/communication errors)
Diagnostic algorithm
- Retrieve full DTC list and freeze-frame data using a compatible Mitsubishi diagnostic scanner. Note time and conditions when code set.
- Visually inspect trunk area for obvious mechanical obstructions, damaged hinges, latch or strut. Clear any foreign objects and re-test.
- Inspect actuator wiring and connector for corrosion, broken wires or water ingress. Wiggle-test harness while commanding trunk to look for intermittency.
- Check fuses/relays for the trunk/BCM circuit. Replace any blown fuses and retest.
- With a multimeter, measure voltage at the actuator connector while commanding open: supply should be present and stable. If no supply, trace back to BCM/relay/fuse.
- Measure actuator current while operating. Excessive current or stuck motor indicates mechanical jam or failed actuator; low/no current with supply present indicates open circuit or failed motor windings.
- If actuator electrical and mechanical checks pass, verify trunk open/closed sensor operation (continuity or switched voltage) and correct signaling to BCM.
- If wiring, power, ground and sensor are good but code persists, use diagnostic scanner to command the actuator and monitor BCM inputs/outputs and CAN messages. Check for communication errors.
- Replace trunk cylinder/actuator if confirmed faulty. After repair, clear codes and perform several open/close cycles to confirm correct operation and no new codes.
- If fault persists after actuator replacement, inspect BCM or trunk control unit and related software calibration — consult manufacturer service information for module programming or replacement procedures.
Likely causes
- Damaged connector or corroded pins at actuator
- Actuator motor drawing excessive current (internal wear or jam)
- Foreign object preventing full travel of the cylinder
- Open or short in the trunk actuator wiring harness
- Faulty trunk latch/lock mechanism interfering with travel
Fault status
Status
Trunklid cylinder open operation cycle fault detected — trunk did not complete expected open cycle.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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