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Home / DTC / B1313 — Timeout error (Topstack down)

B1313 — Timeout error (Topstack down)

Detailed page for trouble code B1313.

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Code

B1313

MITSUBISHI B — Body

Timeout error (Topstack down)

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

Causes

  • Mechanical obstruction or binding in the top/roof mechanism
  • Failed or slow actuator/motor
  • Faulty or misadjusted limit/home position switch or sensor
  • Intermittent or open power or ground to the actuator or control module
  • Damaged wiring or poor connector contact (corrosion, pin damage)
  • Control module software/firmware fault or internal fault

Symptoms

  • Top/roof stops before completing the down movement and times out
  • Inoperative or slow retractable roof/sunroof operation
  • Noise from motor struggling without full travel
  • Warning lamp or message on dash related to roof/top
  • Intermittent operation or works only in one direction

What to check

  • Scan for additional DTCs and read freeze-frame/extended data
  • Confirm battery voltage is healthy (12–14 V) during operation
  • Visually inspect top/roof tracks, linkages and mechanism for obstructions
  • Inspect wiring harnesses and connectors for corrosion, damage, or loose pins at actuator and control module
  • Check fuses and relays related to the top/roof circuit
  • Operate the roof while monitoring motor voltage and current

Signal parameters

  • Actuator supply voltage (V) during operation
  • Actuator ground continuity and resistance (ohms)
  • Motor current draw (A) — compares to specified range
  • Limit/position switch state (open/closed) at rest and at end-of-travel
  • Time to complete travel vs. expected timeout threshold (s)
  • CAN/comm messages for roof module and response timeout counters

Diagnostic algorithm

  1. Retrieve all stored codes and any related freeze-frame data. Note whether code is persistent or intermittent.
  2. Verify vehicle battery voltage and charging system to ensure adequate supply during roof operation.
  3. Attempt the top down operation while an assistant watches mechanism. Listen for motor noise and observe motion; note where it stops.
  4. Visually inspect tracks, hinges and linkages; clear any debris and verify free movement by hand where safe.
  5. Inspect fuses and relays for the top/roof circuit; replace if suspect.
  6. Backprobe the actuator power and ground while operating to confirm voltage is present when commanded.
  7. Measure motor current while operating. High current indicates binding or motor wear; near-zero indicates loss of power or open circuit.
  8. Test limit/home position switches or position sensors for correct switching at travel endpoints. Replace or adjust as required.
  9. Inspect and wiggle connectors and wiring harness for intermittent faults; repair any damaged wiring or corroded pins.
  10. If electrical and mechanical checks are good but timeout persists, check for lost communications (scan for U-codes) and consider reflashing or replacing the roof control module per manufacturer procedure.
  11. Clear codes and perform multiple cycles to confirm repair. Document findings and recheck after road test or several cycles.

Likely causes

  • Stuck or jammed roof/top mechanism preventing full travel
  • Worn or failing motor drawing excessive current and timing out
  • Faulty position/limit switch not signaling end-of-travel
  • Blown fuse or bad relay supplying the top actuator
  • Corroded connector at actuator or limit switch

Fault status

⚠️ Status
Timeout occurred during 'topstack down' operation; expected end-of-travel or acknowledgement not received within allowable time. Check actuator, limit switches, power/ground, wiring, and module communication.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1310 B1311 B1312 B1314 U0100 U0073
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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