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Home / DTC / B29DC — Rear center latch:close cycle

B29DC — Rear center latch:close cycle

Detailed page for trouble code B29DC.

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Code

B29DC

MITSUBISHI B — Body

Rear center latch:close cycle

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

Causes

  • Mechanical obstruction or binding in the latch or striker
  • Failed or weak latch actuator (motor)
  • Faulty latch position/limit switch or sensor
  • Damaged wiring, connector corrosion, open or short in circuit
  • Poor ground or low battery voltage during operation
  • Faulty body control module (BCM) or software/firmware error

Symptoms

  • Rear center door/hatch fails to latch or stays ajar
  • Warning chime or message on the dash indicating door not closed
  • Intermittent or no response when using remote or interior switch to close
  • Audible motor noise without latch engagement
  • DTC B29DC (rear center latch: close cycle) stored in memory

What to check

  • Scan and record the stored DTC(s) and freeze-frame data; note conditions when fault occurred
  • Attempt to reproduce fault while monitoring live data/actuator status with a diagnostic tool
  • Visually inspect latch area, striker, and surrounding trim for obstructions or damage
  • Inspect wiring harness and connector at the latch for corrosion, looseness, or damage
  • Check battery voltage and ground integrity while operating the latch
  • Operate latch with a scan tool (command ON/OFF) and listen/watch for normal movement

Signal parameters

  • Position switch: continuity closed when latch reached closed position (0 ohms/closed vs open)
  • Actuator supply voltage: ~12 V when commanded (should drop with load if motor draws current)
  • Actuator coil/motor resistance: compare to specification (typical low ohms for a small motor)
  • Operation time: latch should complete close within expected milliseconds/seconds (manufacturer spec)
  • BCM feedback: status bit or sensor state for 'closed' vs 'open' available in live data

Diagnostic algorithm

  1. Read and record all DTCs and freeze-frame; clear codes and try to reproduce the complaint.
  2. Visual inspection: check latch mechanism, striker alignment, and remove any debris or foreign objects.
  3. With ignition ON, operate the latch using the diagnostic tool while observing movement and listening for abnormal noises.
  4. Monitor live data: confirm position sensor changes state during the close cycle. If sensor does not change, suspect sensor/actuator or mechanical binding.
  5. Check voltage at the latch connector while commanding close: verify battery voltage arrives and ground is present. If no voltage, trace wiring back to BCM/fuse/relay.
  6. Measure actuator/motor resistance and continuity of position switch. Replace if out of specification or intermittent.
  7. If actuator receives correct voltage but does not move, remove latch and inspect/replace actuator or internal gears.
  8. Repair any damaged wiring or connectors; clean and apply dielectric grease to corroded terminals after repair.
  9. After repairs, reassemble, adjust striker alignment if necessary, clear codes and perform multiple open/close cycles to verify correct operation and that code does not return.
  10. If wiring and latch are good but problem persists, update BCM software if available and consider BCM replacement after verifying with manufacturer procedures.

Likely causes

  • Latch physically stuck or debris preventing full travel
  • Worn or failed actuator motor or internal gears
  • Position switch not making contact (open circuit or intermittent)
  • Connector corrosion or broken wire at latch harness
  • BCM did not receive expected feedback due to wiring/connector fault

Fault status

⚠️ Status
Rear center latch close cycle abnormal — expected closed position/feedback not received within allowed time or sensor state incorrect.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2900 B2901 B2910 B2911 B2999
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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