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Home / DTC / B29DD — Rear center latch:close cycle

B29DD — Rear center latch:close cycle

Detailed page for trouble code B29DD.

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Code

B29DD

MITSUBISHI B — Body

Rear center latch:close cycle

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

Causes

  • Faulty rear center latch actuator (motor or solenoid)
  • Faulty latch position/limit switch or sensor
  • Broken, shorted, corroded or disconnected wiring/connectors to the latch
  • Mechanical obstruction, foreign object or binding in the latch mechanism
  • Latch misalignment or worn latch components
  • Blown fuse or faulty relay supplying the latch circuit

Symptoms

  • Rear center latch (trunk/tailgate) will not fully close, lock or indicate closed
  • Warning message or lamp related to trunk/tailgate on dash
  • Unusual motor noise or no sound when trying to close/lock the latch
  • Intermittent or complete inability to secure rear hatch
  • Possible inability to operate central locking for that latch only

What to check

  • Read and record stored DTC(s) and freeze frame data with a diagnostic scanner
  • Visual inspection of the rear center latch for damage, foreign objects, rust or misalignment
  • Check fuses and relays related to central locking / hatch circuit
  • Operate the latch while listening for actuator noise and observing movement
  • Inspect and wiggle the wiring harness and connector for corrosion, bent pins or loose terminals
  • Measure supply voltage at the latch connector while commanding close from a scan tool

Signal parameters

  • Actuator supply voltage when commanded: approximately 10–14 V (battery voltage) at the latch connector
  • Actuator motor resistance (typical) when measured across motor pins: low ohms (commonly 2–30 Ω depending on design)
  • Position/limit switch output: digital state (0 V/ground = open or closed depending on design) or switched to supply voltage when latch reaches position
  • No voltage or intermittent voltage at connector indicates wiring/connector or fuse/relay issue
  • During command, expect steady supply voltage; fluctuating or pulsed voltage may indicate controller PWM drive

Diagnostic algorithm

  1. Connect a diagnostic scanner, read and note B29DD and any related codes. Clear codes and attempt a test close cycle to re-check behavior.
  2. Perform a visual inspection of the latch area for obstructions, damage, corrosion or misalignment. Manually operate the latch to confirm free movement.
  3. Check related fuses/relays and verify proper battery voltage at the control side of the relay when commanded.
  4. Command the latch closed via the scanner or remote while an assistant listens at the latch. Note whether the actuator runs, stalls, or is silent.
  5. Probe the latch connector while commanding the close: verify presence of ~12 V (or expected drive) and a good ground. If no drive, troubleshoot wiring and BCM outputs.
  6. If actuator receives proper voltage but latch does not move, check actuator motor resistance and continuity; if motor is open or very high resistance, replace actuator/latch assembly.
  7. If actuator does not receive voltage, backprobe the harness toward the BCM checking for continuity, short to ground, or open circuits. Repair damaged wiring or connectors.
  8. Test the latch position/limit switch: verify it changes state when latch is moved to closed position. Replace switch or latch assembly if the sensor fails.
  9. Clean and lubricate latch mechanism if movement is sticky; re-align latch striker if misaligned and re-test.
  10. After repair or replacement, clear codes, perform multiple close cycles using the scanner to confirm the close cycle completes and no B29DD returns. Document findings.

Likely causes

  • Defective latch actuator or internal switch (most common)
  • Corroded/loose connector at the latch causing intermittent signal or power loss
  • Mechanical jam (dirt, rust, foreign object) preventing latch from reaching closed position
  • Open or short in wiring harness between BCM and latch
  • Failed latch position sensor (no closed feedback)

Fault status

⚠️ Status
Rear center latch: close cycle not detected or latch did not report closed position within expected time.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B29DA B29DB B29DC B29DE
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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