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Home / DTC / B28E4 — Valve02 output:open line

B28E4 — Valve02 output:open line

Detailed page for trouble code B28E4.

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22,491specific
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Code

B28E4

MITSUBISHI B — Body

Valve02 output:open line

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

Causes

  • Open or broken wiring between control module and Valve02
  • Disconnected, loose or corroded connector at valve or module
  • Failed Valve02 (open coil) / internal solenoid open-circuit
  • Blown fuse or open relay in the supply/drive circuit
  • Poor ground connection for the valve circuit
  • Faulty body/control module output driver (stuck open)

Symptoms

  • Related system function tied to Valve02 does not operate (e.g., HVAC blend, purge, fuel/EVAP, or other solenoid function)
  • DTC stored in body/control module; possible message or lamp depending on system
  • No audible click from valve when commanded
  • Intermittent operation if wiring is partially damaged

What to check

  • Visually inspect wiring and connectors at Valve02 and the control module for corrosion, damage, or disconnection
  • Check relevant fuses and relays for the valve circuit
  • Backprobe the valve connector while commanding the valve ON from a diagnostic tool and observe voltage
  • Measure coil resistance of Valve02 with connector disconnected (compare to service specification)
  • Perform continuity check between module output pin and valve pin (with ignition OFF)
  • Check module ground(s) for integrity and continuity to chassis

Signal parameters

  • Key ON, command ON: supply/reference voltage to valve typically battery voltage (~12 V) at the valve harness (verify with service manual)
  • Valve coil resistance: typically in the low ohm to tens of ohms range (e.g., ~5–50 Ω) — consult vehicle service data for exact spec
  • Open-circuit condition: infinite/very high resistance between module output and valve terminal
  • Control module output may be a switched ground or switched +12 V — verify pin function before applying tests

Diagnostic algorithm

  1. Read and record freeze frame and any related DTCs. Note whether the code is current or historical.
  2. Visually inspect valve harness, routing and both connectors for corrosion, bent pins, water ingress or damage.
  3. Verify fuses/relays for the valve supply circuit; replace if blown and retest.
  4. With ignition OFF, disconnect valve connector and measure coil resistance; compare to spec. An open (infinite) reading indicates a failed valve.
  5. Perform continuity check between the control module output pin and the valve terminal. Repair any open circuits or broken wires.
  6. With harness connected, backprobe valve terminals. Command the valve ON using a diagnostic tool and observe voltage/ground behavior. If no command signal appears at the harness but module requests it, suspect wiring; if command present and valve does not operate, suspect valve.
  7. Check grounds: verify continuity from valve ground to chassis and module ground pins.
  8. If wiring and valve are good but no proper output from the module, test/replace the control module output driver per manufacturer procedures.
  9. After repairs, clear codes and perform functional test and road test if applicable. Monitor for reappearance of the DTC.

Likely causes

  • Disconnected or corroded connector at Valve02
  • Broken wire or harness damage (pinched/ chafed) between module and valve
  • Failed valve coil (open resistance)
  • Blown fuse or open supply/relay to the valve
  • Faulty module output transistor (least likely)

Fault status

⚠️ Status
Valve02 output: open line — control module detected an open circuit on the Valve02 drive circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B28E0 B28E1 B28E2 B28E3 B28E5 B28E6
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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