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Home / DTC / B28D1 — Valve01 output:short to battery

B28D1 — Valve01 output:short to battery

Detailed page for trouble code B28D1.

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Code

B28D1

MITSUBISHI B — Body

Valve01 output:short to battery

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

Causes

  • Damaged or chafed wiring harness with a contact to battery power
  • Shorted connector (pin pushed into positive feed or contact bridged)
  • Defective valve/solenoid internally shorted to battery
  • Failed ECU output driver (internal short to battery rail)
  • Aftermarket accessories or jump-starting damage creating a backfeed
  • Corrosion or water intrusion in connector creating unintended continuity to battery

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated and B28D1 stored
  • Associated valve may be stuck ON or non-responsive
  • Reduced engine performance or abnormal system operation depending on valve function
  • Possible battery drain or fuse blow if short is severe
  • Intermittent faults if wiring is damaged and only contacts under vibration

What to check

  • Read and record freeze-frame and live data with a scan tool; note valve commanded vs. measured state
  • Visually inspect the valve connector and wiring for damage, corrosion, melted insulation or oil/water ingress
  • Backprobe the valve harness and measure voltage at the ECU/connector with ignition ON and with the valve commanded OFF and ON
  • Measure the resistance of the valve/solenoid with it unplugged from the harness (compare to specification)
  • Check for continuity between the output pin and battery positive (should not have direct short when circuit is off)
  • Unplug the valve and clear the code, then monitor to see if code returns (helps isolate between valve/load and ECU)

Signal parameters

  • Expected output voltage (valve OFF): near 0 V (low) at the output driver; no direct battery feed
  • Expected output voltage (valve ON): switched to battery voltage (~12 V) when commanded ON
  • Solenoid coil resistance (typical): usually tens of ohms — consult Mitsubishi service data for exact value
  • Current draw when ON: depends on valve type; excessive current suggests coil short or partial short to battery
  • Fault condition detected when output pin reads battery voltage while ECU is commanding OFF

Diagnostic algorithm

  1. Use a scan tool to confirm B28D1 and note freeze-frame/conditions.
  2. Visually inspect valve, connector and wiring for obvious damage, corrosion or signs of heat.
  3. With ignition ON (engine OFF), backprobe the valve harness output pin. Verify voltage with valve disconnected and ECU commanding OFF. If battery voltage present → short to battery on harness or inside ECU.
  4. Measure valve coil resistance with valve unplugged. If very low (near short) or infinite (open), replace the valve.
  5. If coil resistance is normal, check continuity between the output circuit and battery positive to locate wiring short (use multimeter, detach connectors to isolate segments).
  6. Repair any damaged wiring or connectors and retest. If short remains after harness/connector/valve verified good, suspect ECU output driver failure.
  7. Before replacing ECU, confirm fault persists with known-good load or bench-tested valve and ensure no external feeds/jumpers are backfeeding the circuit.
  8. After repairs, clear codes and perform a road/functional test to verify the fault does not return.

Likely causes

  • Wiring harness chafe/insulation damage near engine or routing points
  • Connector terminal pushed/bridged to a fused battery feed
  • Valve/solenoid coil shorted or internally grounded to positive
  • ECU driver transistor failed (less common) after wiring/valve verified good

Fault status

⚠️ Status
Output circuit for Valve01 detected short to battery voltage (high voltage present on output when it should be low).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B28D0 B28D2 B28D3
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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