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Home / DTC / B29D6 — Rear center latch:open timeout

B29D6 — Rear center latch:open timeout

Detailed page for trouble code B29D6.

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Code

B29D6

MITSUBISHI B — Body

Rear center latch:open timeout

Brand: MITSUBISHI
Type: B — Body
AI status
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Page language: EN

Causes

  • Faulty rear center latch actuator or motor
  • Stuck or mechanically jammed latch (corrosion, foreign object, misalignment)
  • Damaged or misadjusted latch position sensor/switch
  • Broken wiring, poor connector contact or corrosion at latch connector
  • Insufficient supply voltage (weak battery, blown fuse, poor ground)
  • Faulty BCM or latch control module software/firmware error

Symptoms

  • Rear hatch/center latch does not open when commanded (key fob, interior switch or BCM command)
  • Hatch appears unlocked but does not release
  • Unusual noise from latch area (grinding, clicking, or motor noise without movement)
  • Trunk/hatch open indicator on dash may remain on or show incorrect status
  • DTC B29D6 stored and may illuminate body-related warning or message

What to check

  • Check battery voltage and charging system; low voltage can affect actuator operation
  • Inspect relevant fuses and relays for the latch circuit
  • Visually inspect rear center latch and surrounding area for physical obstructions, corrosion or ice
  • Operate latch while watching/listening for movement; note any noise or lack of movement
  • Scan for related DTCs and view freeze-frame / live data for latch position and command status
  • Inspect wiring harness and connector at the latch for corrosion, bent pins, damage or moisture

Signal parameters

  • Command voltage to latch actuator: approximately battery voltage (≈11–14 V) when driven
  • Return/ground reference voltage: near 0 V
  • Actuator resistance: typically low (example range 2–50 Ω) — consult service manual for exact spec
  • Actuator current draw during operation: may be several hundred mA to a few A
  • Expected actuation time: latch should reach open position within a fraction of a second to a few seconds (timeout exceeded triggers DTC)
  • Latch position sensor output: discrete open/closed logic signal or variable position; must change state when commanded

Diagnostic algorithm

  1. Read and record DTCs and freeze-frame data with a capable scan tool. Note if B29D6 is current or history and any related codes.
  2. Visually inspect the latch area for foreign objects, corrosion, rust, bent linkages or ice. Manually free any obvious obstruction.
  3. Attempt to operate the latch using the interior switch and key fob while observing latch movement. Listen for motor or solenoid sounds.
  4. With a scan tool, command the latch open and monitor live data for command status and latch position feedback. Note whether the BCM issues the command and whether position changes.
  5. Back-probe the latch connector while commanding open: verify supply voltage appears and ground/pulse is present. If no voltage, trace wiring back to fuse/relay/BCM.
  6. Measure the actuator coil resistance with the connector disconnected. Compare to service specification. A very high or infinite resistance suggests open motor; very low may indicate short.
  7. Check for continuity and shorts between latch wiring and chassis ground or battery positive. Wiggle harness to try reproduce intermittent faults.
  8. If actuator gets correct voltage but does not move, remove the latch assembly and test actuator on bench (apply appropriate voltage briefly) to confirm mechanical/electrical operation.
  9. Repair or replace damaged wiring, connector, latch motor, or position sensor as indicated. Clean and lubricate latch mechanism and reassemble.
  10. Clear DTCs, re-test latch operation multiple cycles, and confirm no return of B29D6 or related codes. If code returns with correct wiring and actuator, investigate BCM/latch controller software or replacement.

Likely causes

  • Mechanical binding or obstruction at the latch preventing movement
  • Failed or seized latch actuator/motor
  • Open/short or intermittent wiring/connector at the latch
  • Faulty latch position switch that doesn't report 'open' position

Fault status

⚠️ Status
Rear center latch open timeout — controller commanded latch to open but latch position feedback did not indicate 'open' within the allowed time; DTC stored.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B29D4 B29D5 B2900 B2471 U0121
406

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