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Home / DTC / B2911 — F/B trunk status output:SHT-BAT

B2911 — F/B trunk status output:SHT-BAT

Detailed page for trouble code B2911.

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Code

B2911

MITSUBISHI B — Body

F/B trunk status output:SHT-BAT

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

Causes

  • Wiring shorted to battery (pin contact rubbing on B+ or chafed insulation)
  • Faulty or stuck trunk latch/switch (internal short)
  • Corroded/contaminated connector or terminal causing unintended B+ feed
  • Aftermarket accessories tied into trunk circuit
  • Faulty BCM/trunk control module output

Symptoms

  • Trunk-open/closed indicator incorrect or permanent
  • Trunk interior lamp may remain on
  • Warning chime or message about trunk not closing properly
  • Remote lock/unlock or auto-lock behavior affected
  • DTC stored and may be intermittent depending on vehicle position

What to check

  • Read and record freeze-frame and related trunk/BCM codes with a scan tool
  • Visual inspection of trunk harness, hinge area, latch, and connectors for damage, corrosion, or aftermarket splices
  • Check trunk switch/latch connector for battery voltage with connector disconnected
  • Backprobe signal pin while operating trunk to observe voltage changes
  • Wiggle harness at hinge while watching live data to reproduce the fault
  • Measure continuity to chassis ground and check for unintended battery feed

Signal parameters

  • Normal: trunk status signal should switch between near 0 V (ground) and battery depending on switch state
  • Fault condition: signal remains near battery voltage (~12 V) when it should be low
  • If short-to-battery present, resistance from signal pin to battery + will be low
  • If short-to-ground present (different code), signal would be held near 0 V

Diagnostic algorithm

  1. Connect scan tool, confirm B2911 and note any other related codes. Clear codes and perform a test cycle to see if code returns.
  2. Visually inspect trunk latch, harness through hinges, and all connectors for damage, corrosion, or splices. Repair any obvious wiring damage.
  3. With ignition ON, backprobe the trunk status signal at the BCM and at the latch connector. Operate the latch and observe voltage. A stuck high (~12 V) when it should be low indicates short to battery or stuck switch.
  4. Disconnect the trunk latch/switch connector. If the code clears and the signal at the BCM goes to the expected state, the latch or its shorted wiring is likely the cause.
  5. If disconnecting the latch does not change the signal, isolate wiring by inspecting and unplugging intermediate connectors, and perform continuity/short-to-voltage tests between the signal wire and battery +.
  6. Repair wiring or replace the trunk latch/switch as indicated. Protect repaired harness with loom and routing to avoid re-chafing.
  7. After repair, reconnect, clear codes, and verify proper operation through multiple open/close cycles and a road/park test to ensure the fault does not return.
  8. If wiring and latch check good but fault persists, test/replace BCM or trunk control module following manufacturer procedures.

Likely causes

  • Chafed wire contacting a constant 12 V source near hinge or body harness
  • Trunk latch microswitch has internal short to B+
  • Water intrusion at trunk connector causing corrosion and bridging to B+
  • Connector mis-mated or pin pushed out contacting battery feed

Fault status

⚠️ Status
Trunk status output circuit: short to battery detected (SHT-BAT). Circuit held at battery voltage when it should change state.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2910 B2912 B2913 B2800
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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