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Home / DTC / B29D8 — Rear center latch:close timeout

B29D8 — Rear center latch:close timeout

Detailed page for trouble code B29D8.

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11,451generic
22,461specific
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Code

B29D8

MITSUBISHI B — Body

Rear center latch:close timeout

Brand: MITSUBISHI
Type: B — Body
Views: UK: 16 EN: 23 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical obstruction or misalignment preventing latch from closing
  • Failed or seized latch actuator/motor
  • Faulty latch position sensor (switch or hall sensor)
  • Open, short, poor connection, or corrosion in wiring or connector to the latch
  • Blown fuse or poor ground at latch circuit
  • Body control module (BCM) or latch control unit software/hardware fault

Symptoms

  • Rear center door/boot does not fully latch or stays ajar after close command
  • Warning lamp or message on dash indicating door not closed
  • Repeated attempts by vehicle to close latch (audible motor operation) with no success
  • Battery drain if circuit remains energized
  • Intermittent operation or only manual closure possible

What to check

  • Read and record DTCs and freeze-frame data with a diagnostic scanner
  • Try to reproduce fault by performing close cycle several times (key, switch, or remote)
  • Visually inspect rear center latch for foreign objects, corrosion, or visible damage
  • Check fuses and instrument cluster/BCM warning indicators related to doors
  • Inspect electrical connector at latch for corrosion, bent pins, or water ingress
  • Verify wiring continuity and for chafing where harness passes hinge or body panels

Signal parameters

  • Supply voltage at latch connector when commanded: ~12 V (vehicle battery voltage)
  • Actuator current draw during movement: typically hundreds of mA to a few amps (motor stall will show higher current)
  • Position feedback signal: open/closed state (binary switch) or analog/Hall sensor output — expected logic levels 0/5 V or CAN status message
  • Resistance of actuator motor (unpowered): low ohms (check against service spec)
  • Time-to-close expected: usually
  • CAN/diagnostic message showing latch state and timestamp (if vehicle uses networked latch reporting)

Diagnostic algorithm

  1. Capture DTCs and freeze-frame data with a scan tool; note conditions when code set (voltage, ambient temp, ignition state).
  2. Clear codes, then attempt to recreate the fault by commanding the rear center latch to close via switch or diagnostic tester while monitoring status.
  3. Visually inspect latch area for obstructions, damaged striker, or misalignment; try manual operation of latch and striker engagement.
  4. Inspect connector and wiring for corrosion, bent pins, water ingress, or damage; perform wiggle test while commanding close to check for intermittent wiring faults.
  5. Check related fuses and grounds for good tightness and continuity to chassis ground.
  6. Measure supply voltage at the latch connector while commanding close. If there is no voltage, trace back to BCM/power distribution and repair open/relay/fuse as needed.
  7. If supply present, measure actuator current during operation — compare to spec. A no-current or very high current condition indicates open circuit or motor stall/short respectively.
  8. Test position feedback sensor (switch or hall) for correct operation: verify state change when latch is closed (using multimeter or scanner live data).
  9. If wiring and power/ground are OK, bench-test or substitute a known-good latch/actuator to confirm whether latch assembly is faulty.
  10. If latch replacement is required, fit new latch/actuator, perform any manufacturer-specific initialization or relearn procedure, clear codes and verify operation through multiple cycles.
  11. If actuator and wiring check OK but module output is absent, investigate BCM/latch control unit, network communications, and consult manufacturer diagnostics/software updates before replacing control module.

Likely causes

  • Contaminated or jammed latch mechanism
  • Actuator motor failure or high internal resistance
  • Corroded or loose connector at the latch
  • Open/short in power or ground feed to latch
  • Faulty position feedback sensor inside latch

Fault status

⚠️ Status
Rear center latch close command issued but no closed-position feedback received within the allowed time window; latch close timeout recorded.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.8-2.0 hours

Similar codes

B29D7 B2900 B29D9 B2990 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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