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Home / DTC / B28D2 — Valve01 output:short to ground

B28D2 — Valve01 output:short to ground

Detailed page for trouble code B28D2.

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11,451generic
22,461specific
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Code

B28D2

MITSUBISHI B — Body

Valve01 output:short to ground

Brand: MITSUBISHI
Type: B — Body
Views: UK: 22 EN: 32 RU: 23
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Page language: EN

Causes

  • Damaged or chafed wiring shorting to chassis ground
  • Corroded or bent connector pins contacting ground
  • Faulty valve/solenoid coil internally shorted
  • Shorted output transistor or driver inside the control module
  • Water ingress or contamination at connector causing short

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Associated system inoperative or stuck (depending on what Valve01 controls)
  • Possible rough idle, reduced performance or limp mode
  • Intermittent fault codes or loss of function when harness is moved

What to check

  • Confirm code is current and note freeze frame / live data
  • Visually inspect wiring and connector for damage, corrosion, or moisture
  • Wiggle harness and connector with key on (engine off) to reproduce fault
  • Measure resistance of the valve/solenoid with connector disconnected
  • Perform a short-to-ground continuity check between the output pin and chassis ground with battery disconnected
  • Backprobe the output while commanding the valve ON/OFF (use manufacturer procedure)

Signal parameters

  • Body/chassis voltage (reference): approx. 11–14.5 V with engine running
  • Typical solenoid coil resistance (varies by application): commonly ~5–50 ohms (consult service data for exact value)
  • Expected harness continuity to valve: low resistance to valve, open to ground when valve disconnected (no direct short)
  • When controller commands ON: output should switch to its expected state (battery voltage or ground depending on circuit type) — consult vehicle wiring diagram
  • Short-to-ground condition: near 0 ohms/continuity between output pin and chassis ground when it should not be present

Diagnostic algorithm

  1. Retrieve freeze-frame and live-data, and clear the code to see if it returns immediately.
  2. Identify Valve01 circuit on the vehicle wiring diagram to determine if the output is a high-side or low-side driver and locate connector pin assignments.
  3. With ignition OFF, disconnect the valve/solenoid connector. Inspect pins and housing for corrosion, bent pins, or water ingress.
  4. Measure coil resistance at the valve/solenoid terminals. Compare to specified resistance in service manual. A very low resistance may indicate an internal short.
  5. With battery negative disconnected, check continuity between the controller output pin and chassis ground. A direct short indicates harness/connector damage or internal controller fault.
  6. If no short with valve disconnected, reconnect valve and backprobe the output. Command the valve ON/OFF while monitoring voltage/current. Note whether the module is driving or the circuit is held to ground.
  7. If short only appears when the harness is connected to valve, suspect the valve or field wiring. If short is present with connector disconnected at the valve, suspect internal controller failure.
  8. Repair identified wiring damage or replace corroded connectors. After repair, retest and clear codes.
  9. If wiring and valve check good but short persists, consider removing and bench-testing the controller or replacing the control module per manufacturer guidance.
  10. After repairs, perform road test and recheck for code recurrence and proper system operation.

Likely causes

  • Wiring harness chafe against body/chassis at a routing point
  • Connector terminal pushed out or pin contacting housing/body
  • Valve/solenoid coil failed with internal short to its case
  • Controller output stage failed (wet, overheated, or defective)

Fault status

⚠️ Status
Valve01 output circuit detected short to ground. Control module has logged a fault for an output driver shorting to chassis ground.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B2800 B2810 B2820 P0201 P0627
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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