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Home / DTC / B2939 — Down latch LH open:close timeout

B2939 — Down latch LH open:close timeout

Detailed page for trouble code B2939.

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22,491specific
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Code

B2939

MITSUBISHI B — Body

Down latch LH open:close timeout

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

Causes

  • Failed or weak latch motor/actuator
  • Position sensor or switch fault inside the latch
  • Mechanical binding, corrosion, debris or misalignment of latch
  • Damaged wiring, poor connector, or intermittent open/short to latch
  • Insufficient battery voltage or blown fuse/relay in the circuit
  • Control module/software fault or incorrect adaptation/calibration

Symptoms

  • Left-hand door/tailgate/cover may not latch or unlatch reliably
  • Repeated fault lamp or stored DTC related to left-hand latch
  • Audible motor noise without corresponding latch movement
  • Intermittent or complete loss of powered open/close on LH side
  • Manual operation feels rough or binding

What to check

  • Read all related DTCs and freeze-frame data with a diagnostic scanner
  • Visually inspect latch, striker, and surrounding hardware for damage or foreign objects
  • Check fuses and relays for the latch/power-door circuit
  • Inspect wiring harness and connector at the LH latch for corrosion, loose pins, frays or damage
  • Command the latch with a scan tool (open/close) and observe behavior
  • Measure supply voltage and ground at the latch connector during operation

Signal parameters

  • Supply voltage to actuator: approx. battery voltage during operation (expected ~11–14 V)
  • Actuator current draw: typically in the 0.5–5 A range during movement (varies by model)
  • Position switch/feedback: ON/OFF or 0/5 V type signal (or low/high logical state to BCM)
  • Time to complete travel: measured operation time should match manufacturer specification (timeout exceeded triggers DTC)
  • Connector pin resistance: actuator coil may measure a few ohms to tens of ohms (model dependent)

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data. Note whether fault occurs on open, close, or both and whether the condition is repeatable.
  2. Attempt to reproduce the fault via scan tool command while watching/feeling the latch. Record whether the actuator moves and time taken.
  3. Visually inspect the LH latch, striker, and linkage for binding, damage, or foreign objects. Manually operate latch (with power removed if required) to check for smooth travel.
  4. Inspect and wiggle the wiring harness and connector at the latch while commanding operation to check for intermittent connection. Repair/replace damaged connectors or wiring.
  5. With the latch commanded to move, measure voltage at the supply pin and the quality of the ground. Low voltage or intermittent ground indicates wiring or fuse/relay issue.
  6. Measure current draw of the actuator during operation. Excessive current suggests mechanical binding; no/very low current suggests open circuit or failed motor.
  7. Check position-sensor/limit-switch continuity or feedback signal to the body control module. Replace latch assembly if internal switches are faulty and cannot be serviced separately.
  8. If wiring and latch tests pass, inspect BCM/door module outputs and software; check for TSBs/reprogramming or required relearn procedures. Replace module only after confirming harness and latch failure are not present.
  9. Clear codes, perform repairs, then verify repair by exercising the latch repeatedly and rechecking for recurrence of the DTC.

Likely causes

  • Motor stuck or worn (actuator does not move or is slow)
  • Position switch inside latch not changing state (no feedback)
  • Connector corroded or pins bent at latch harness
  • Foreign object or misadjusted striker preventing latch travel
  • Poor ground connection causing low current to actuator

Fault status

⚠️ Status
Left-hand down latch open/close operation timed out — latch did not reach expected position within allotted time.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2938 B2940 B2900 B2917 B2950
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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