B2938

Code

MITSUBISHI B — Body

Down latch LH open:close timeout

Brand: MITSUBISHI

Type: B — Body

Views: UK: 8 EN: 17 RU: 10

AI status

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Page language: EN

Causes

Mechanical binding or obstruction in the LH down latch mechanism
Faulty latch actuator or motor (stuck or weak)
Defective position or limit switch inside the latch assembly
Damaged, corroded, or loose connector or wiring between latch and control module
Blown fuse or inadequate power/ground to the latch circuit
Faulty body control module (BCM) or latch control module software/hardware

Symptoms

LH down latch does not fully open or close when commanded
Slow or stalled latch motor noise during operation
Warning indicator or message related to door/latch on the dash (model dependent)
Stored B2938 trouble code and possibly related codes
Door or panel may not lock/latch properly; may reopen or remain unlatched

What to check

Scan vehicle with a compatible diagnostic tool and read freeze frame/live data for the event
Visually inspect the LH latch area for obstructions, corrosion, or physical damage
Inspect connector and wiring for corrosion, bent pins, breaks, or chafing
Verify fuses and relays feeding the latch circuit
Operate the latch while observing for binding, unusual noises, or delayed motion
Check for stored related codes (communication, power, or position sensor faults)

Signal parameters

Command signal from BCM to latch (open/close request) — verify present when operation requested
Position/limit switch feedback (open/closed state) — should change state at end of travel
Supply voltage at latch during operation (should be battery voltage or within spec)
Ground continuity for latch motor/actuator circuit
Motor current draw during operation (high current may indicate mechanical seizure; no current may indicate open circuit)
Operation time vs expected timeout value (compare elapsed time to manufacturer spec)

Diagnostic algorithm

Retrieve freeze frame and all stored codes. Note conditions when B2938 set (temperature, ignition state, vehicle speed).
Attempt to operate the LH latch while monitoring live data/inputs with a scan tool. Confirm whether the control module issues open/close commands and whether position feedback changes.
Visually inspect the LH latch assembly for debris, corrosion, broken linkages, or physical damage. Manually operate the mechanism (if safe) to check for binding.
Inspect connectors and wiring harness to the LH latch for corrosion, bent pins, loose terminals, or insulation damage. Wiggle test harness while observing live data for intermittent faults.
Check fuses and relays for the latch circuit. Verify proper power and ground at the latch connector with ignition on and during operation.
Measure supply voltage to the latch during operation. If voltage is present but motor does not run, measure motor resistance and current draw to evaluate motor condition.
Command the latch directly using the diagnostic tool (if supported) to isolate between control module and latch. Observe whether latch responds to direct commands.
If position/limit switch feedback does not change, bench-test the latch assembly (removed from vehicle) to confirm internal switch or actuator failure.
Repair or replace any damaged wiring, connectors, fuses, or the latch assembly as indicated by tests. Lubricate and correct alignment if mechanical binding is found.
After repairs, clear codes and perform multiple operation cycles to confirm correct timing and operation. Re-scan to ensure B2938 does not return.
If all wiring and latch tests pass and fault persists, consider ECU/BCM module diagnostics or replacement per manufacturer procedures.

Likely causes

Corroded or loose connector at the LH latch
Latching mechanism physically jammed (dirt, bent linkage)
Worn or failed latch actuator or internal limit switch
Intermittent power or ground to the latch motor
Control module timing or software detecting slower-than-expected movement

Fault status

⚠️ Status

Control module commanded the left-hand down latch to open or close but did not receive the expected position feedback within the allowed time (timeout).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 2.5 hours

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