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Home / DTC / B28A5 — Side latch motor:over current

B28A5 — Side latch motor:over current

Detailed page for trouble code B28A5.

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Code

B28A5

MITSUBISHI B — Body

Side latch motor:over current

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

Causes

  • Mechanical obstruction or binding in latch/slider mechanism
  • Worn, seized or internally shorted motor
  • Short to ground in motor power or ground circuit
  • Poor connector or high-resistance connection causing heat and abnormal current draw
  • Failed motor driver or body control module output stage
  • Foreign object trapped in latch or guide

Symptoms

  • Side/slide door latch does not operate or moves slowly
  • Fuse or circuit breaker for latch circuit blows or trips
  • Diagnostic trouble code B28A5 stored in body control module
  • Burning smell or heat at motor or connector in severe cases
  • Intermittent operation or loss of remote/automatic locking function

What to check

  • Read and record fault codes with a compatible scan tool; note freeze frame/live data if available
  • Visually inspect latch, motor, wiring and connectors for damage, corrosion or foreign objects
  • Manually operate latch mechanism to check for binding or roughness
  • Inspect fuses and circuit protection devices for opens or damage
  • Use a clamp-type ammeter to measure motor current during operation
  • Measure motor supply voltage at connector during activation (should be near battery voltage when commanded)

Signal parameters

  • Supply voltage at motor during activation: typically ~11–14 V (vehicle battery voltage)
  • Normal running current (typical, varies by vehicle): ~1–5 A
  • Stall/overcurrent condition: can exceed 10–20 A depending on motor; consult vehicle spec
  • Motor coil resistance (typical range): low ohms (often 1–10 Ω) — compare to service data
  • Module detects current above configured threshold and sets B28A5

Diagnostic algorithm

  1. Safety first: Park vehicle, key off, and remove ignition key. If working near airbags or electrical systems, follow vehicle-specific safety procedures.
  2. Clear stored codes and attempt to operate latch while monitoring for code reappearance and current draw.
  3. Visually inspect latch area for debris, bent parts, or signs of impact. Manually operate latch to detect binding.
  4. Inspect wiring and connectors to the motor and body control module for corrosion, damage, pin-back, or water intrusion. Repair as needed.
  5. Check fuses/circuit breakers for the latch circuit. Replace only after cause addressed.
  6. With battery connected, use a clamp ammeter around the motor positive lead and command the motor while watching current. Note peak and steady-state current.
  7. If current is excessive, remove motor (or disconnect motor connector) and attempt to operate the mechanism manually. If manual operation is smooth and current is high only with motor connected, suspect motor or wiring.
  8. With battery disconnected, measure motor coil resistance and inspect motor for internal shorts (compare to spec). If resistance is abnormally low or fluctuates, replace motor.
  9. If motor bench test draws normal current but current is high on-vehicle, inspect harness for chafes/shorts and re-check connector integrity and grounds.
  10. If wiring and motor test good, diagnose motor driver/output stage in the body control module — this may require module bench testing or replacement per manufacturer procedures.
  11. After repair, clear codes and perform functional tests of latch through several cycles and verify no recurrence of over-current code.

Likely causes

  • Motor stalled due to mechanical binding or foreign object (most likely)
  • Internal short or winding degradation in latch motor
  • Damaged wiring harness or connector shorting to ground
  • Failed motor driver in body control module

Fault status

⚠️ Status
Side latch motor over-current detected — motor draws excessive current or circuit short; body control module has flagged fault B28A5.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B28A4 B28A6 B28A0 B28B5 B28C5
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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