B298C

Code

MITSUBISHI B — Body

Trunklid cylinder close:CL cycle

Brand: MITSUBISHI

Type: B — Body

Views: UK: 12 EN: 20 RU: 12

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Page language: EN

Causes

Faulty trunk lid cylinder / electric actuator
Failed or out-of-position close-limit or position switch
Wiring harness damage, loose connector, or corrosion at actuator/switch
Mechanical binding, obstruction, or excessive friction in trunk hinge or latch
Low battery or insufficient voltage during operation
Body control module (BCM) or trunk control unit software/hardware fault

Symptoms

Trunk does not fully close or latches unreliably
Trunk motor runs continuously or for longer-than-normal interval
Trunk close operation aborts or reverses unexpectedly
Trunk warning message or indicator on dash
Clicking or abnormal noise from actuator during close attempt
Intermittent trunk operation

What to check

Read and record all stored codes and freeze-frame data with a capable scan tool
Attempt trunk close while observing actuator behavior and listen for abnormal noises
Visually inspect trunk actuator, hinge, latch, and linkages for binding, damage or foreign objects
Check connector at actuator and any inline switches for corrosion, bent pins, or water intrusion
Measure battery voltage and voltage at the actuator connector during a close command
Check continuity and resistance of wiring between trunk actuator and BCM; inspect grounds

Signal parameters

Actuator supply voltage: ~12 V at rest; should remain >11 V during motor operation
Actuator current draw: typically a few amps; spikes may occur on stall (manufacturer-specific, often
Position/limit switch: open/closed digital state or 0/5 V logic; changes state at fully closed and fully open positions
Command input from BCM: switched 12 V or PWM depending on design during close command
Close cycle time: nominally a couple of seconds; significantly longer or continuous motor run indicates problem

Diagnostic algorithm

Retrieve codes and clear them, then attempt to reproduce the fault with a scan tool connected to monitor live data.
Observe trunk operation while commanding open/close from the switch and from the scan tool; note noises, delays, or failure modes.
Visually inspect actuator, linkage, latch and trunk area for obstructions, deformation, or corrosion. Lubricate hinge/latch if needed and retest.
Check battery voltage and retest with a fully charged battery or jump-start if low voltage is suspected.
With the trunk command active, measure voltage at the actuator power and ground terminals. If no voltage, check fuses, relays, and BCM outputs.
If voltage is present but actuator does not move, disconnect actuator and bench-test it with a fused 12 V supply to confirm motor and internal switch operation.
If actuator motor runs but close cycle signal/limit switch does not change, test or replace position/limit switch or actuator assembly.
Check continuity and resistance of wiring from actuator to BCM; repair any damaged wiring or corroded connectors.
After repairs or replacement, erase codes, perform several open/close cycles with the diagnostic tool, and verify correct signals and no reoccurrence of the code.
If all hardware checks good and fault persists, consider BCM reprogramming, replacement, or professional-level module bench diagnostics.

Likely causes

Defective trunk actuator (cylinder) motor or internal mechanism
Defective close/limit position switch on the trunk actuator
Corroded/loose connector or broken wire in actuator circuit
Obstruction or mechanical resistance preventing full close
Intermittent low-voltage condition (weak battery, poor ground)
Control module misinterpreting signals (less common)

Fault status

⚠️ Status

Trunk lid cylinder close cycle abnormal. Trunk may not close or may operate intermittently. Inspection of actuator, switches, wiring and BCM recommended.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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