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Home / DTC / B2976 — Trunklid cylinder open:OP T/out

B2976 — Trunklid cylinder open:OP T/out

Detailed page for trouble code B2976.

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Code

B2976

MITSUBISHI B — Body

Trunklid cylinder open:OP T/out

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

Causes

  • Failed or weak trunklid cylinder/actuator (hydraulic/electric strut) or motor
  • Faulty trunk position sensor or switch (open/closed detect)
  • Mechanical binding, obstruction or damaged hinge/strut preventing full travel
  • Wiring harness damage, poor connector, or corroded terminal
  • Blown fuse or faulty relay supplying trunk actuator
  • Body control module or trunk ECU fault or software error

Symptoms

  • Trunk/tailgate does not open or takes unusually long to open
  • Automatic trunk open function times out or stops mid-travel
  • Trunk open/close warning lamp or message on dash
  • Audible motor noise without movement, or no motor noise at all
  • Related DTC(s) stored in body control module

What to check

  • Visually inspect trunk hinges, struts, latch and cylinder for damage or obstruction.
  • Operate trunk from switch/key fob and listen/observe actuator movement.
  • Check for stored codes in the body control module and read live data for trunk position and actuator status.
  • Verify battery voltage and аккумулятор supply at actuator during operation.
  • Inspect connectors and wiring for corrosion, damage or loose pins at actuator and trunk position sensor.
  • Check relevant fuses and relays for continuity and correct operation.

Signal parameters

  • Actuator supply voltage: ~12 V (should be near battery voltage during operation)
  • Actuator current draw: expected range depends on design; abnormal high or zero current indicates stall or open circuit
  • Position sensor/switch: discrete closed/open contact or 0–5 V signal depending on sensor type
  • Operation time: trunk should reach full open within a few seconds (manufacturer spec; typical 2–10 s)
  • Control signal from BCM: command present when opening is requested (ON/active)

Diagnostic algorithm

  1. Retrieve freeze frame and full code list from scan tool. Note related body/network faults.
  2. Attempt to reproduce fault: operate trunk from all controls (interior switch, key fob, exterior switch). Observe behavior and time to full open.
  3. Perform visual/mechanical inspection: remove obstructions, check hinges, strut condition, latch operation and for binding or damage.
  4. Check power and ground at actuator while operating. If no power, inspect relevant fuse(s) and relay(s) and wiring back to BCM.
  5. If power present but actuator does not move, measure actuator current draw. Low/zero current suggests open circuit; very high current suggests mechanical binding or stalled motor.
  6. Test trunk position sensor/switch continuity or voltage signal. Verify it changes state when the trunk reaches the open position.
  7. Inspect and wiggle harness/connectors for intermittent faults. Repair or replace damaged wiring or connectors.
  8. If wiring, power and sensors are good, consider replacing the actuator/cylinder assembly or position sensor. Re-test after replacement.
  9. If replacement parts do not clear the fault, check BCM outputs and communication. Update or reflash BCM software per manufacturer bulletin if available.
  10. Clear codes and perform multiple open/close cycles to verify the fault does not recur.

Likely causes

  • Mechanical binding or obstruction preventing full travel
  • Failed trunk actuator/cylinder (no movement or weak movement)
  • Faulty trunk position switch/sensor not reporting open position
  • Damaged wiring or connector between actuator/sensor and BCM
  • Supply fuse/relay blown or intermittent power to actuator

Fault status

⚠️ Status
Trunklid cylinder failed to reach open position within expected time or open position signal not detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2975 B2977 B2794 B2181 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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