Code
B298B
MITSUBISHI
B — Body
Trunklid cylinder close:OP cycle
Views:
UK: 11
EN: 14
RU: 11
AI status
Completed
Completed
100%
Causes
- Faulty trunklid cylinder actuator (motor or hydraulic/pneumatic cylinder)
- Obstruction or mechanical binding in hinge/striker preventing full close
- Faulty or misadjusted close limit switch or position sensor
- Wiring fault, poor connector, or corrosion at actuator or sensor
- Low battery or insufficient supply voltage during operation
- Body control module (BCM) or trunk ECU software/firmware fault
Symptoms
- Trunk/tailgate stops before fully closed or opens again after attempting to close
- Warning chime or dash message indicating tailgate fault
- Trunk operation slow, weak, or noisy during close
- Intermittent or no response from trunk close command (remote, key, switch)
- DTC B298B stored and possibly other related body codes
What to check
- Read and record all stored DTCs and freeze-frame data with a compatible scan tool
- Attempt trunk close while observing operation and listening for abnormal noises
- Check vehicle battery voltage (idle and during trunk operation)
- Inspect fuses and relays for trunk power circuit
- Visual inspection of trunk actuator, hinge, striker, and latch for damage or obstruction
- Inspect connectors and wiring at actuator and associated sensors for corrosion, looseness, or damage
Signal parameters
- Actuator supply voltage during close: ~11–14 V (with engine off, may drop under load)
- Actuator current draw: expected range depends on model; look for abnormally high (stall) or no draw (open circuit)
- Close limit switch/position sensor: open/closed or voltage range (0–5 V) changes at end of travel
- Command input from BCM/trunk ECU: diagnostic data showing start/stop of OP cycle
- CAN/serial messages: trunk module status showing operation state (if applicable)
Diagnostic algorithm
- Connect a manufacturer-capable scan tool. Read and record B298B and any associated codes. Clear codes and attempt one re-test to reproduce.
- Observe trunk close operation while monitoring battery voltage and actuator current (if available). Note abnormal noises, stalls, or interruptions.
- Verify battery state of charge and system voltage. Recharge or load-test battery if voltage is low; retest operation.
- Inspect actuator, cylinder and mechanical linkages for physical damage, binding, debris, or misalignment. Manually cycle trunk (with power disconnected) to confirm free movement.
- Inspect and wiggle connectors/wiring at the trunk actuator and limit switch while repeating operation to detect intermittent faults.
- Check fuses/relays for trunk circuit and replace if faulty. Verify power and ground present at actuator connector during a close command using a voltmeter.
- Test close limit switch/position sensor continuity or voltage change at end of travel. Replace or adjust if not switching reliably.
- If actuator receives correct voltage but does not move or draws excessive current, remove and bench-test or replace the actuator/cylinder assembly.
- If multiple electrical checks pass and actuator is good, inspect BCM/trunk ECU inputs and outputs via scan tool. Check for software updates or ECU faults and reflash/update if required.
- After repairs, clear codes and perform several complete open/close cycles with scan tool monitoring until no fault reappears. Road-test/use normal operation to confirm repair.
Likely causes
- Actuator failed to drive the trunk to the closed position (most common)
- Close limit switch not signaling closed (electrical or mechanical)
- Intermittent connector or damaged harness to cylinder
- Obstruction causing motor stall or timeout
- Insufficient battery voltage under load
Fault status
Status
Trunklid cylinder failed to complete close operation cycle (OP cycle) — close operation interrupted, timed out, or limit not reached.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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