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Home / DTC / P0048 — Boost control solenoid high

P0048 — Boost control solenoid high

Detailed page for trouble code P0048.

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Code

P0048

MITSUBISHI P — Powertrain

Boost control solenoid high

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to battery voltage on the boost control solenoid circuit
  • Faulty boost control solenoid (stuck or internally shorted)
  • Poor or corroded connector or terminal at solenoid
  • Open or damaged wiring harness (intermittent contact or chafing)
  • Faulty ECM/PCM driver on the solenoid output
  • Blown fuse or incorrect aftermarket wiring

Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced engine power or 'limp' mode
  • Erratic boost control or turbo behaviour (overboost or underboost)
  • Poor fuel economy and drivability issues
  • Hissing or unusual turbo actuator noises if vacuum/pressure lines involved

What to check

  • Retrieve freeze frame and full DTC data with a scan tool; note engine conditions when code set
  • Inspect solenoid connector and wiring for corrosion, damage, pin pushed out or bent
  • Backprobe solenoid connector and monitor voltage/ground with key ON and while cranking
  • Measure coil resistance of the solenoid (compare to specification) with connector disconnected
  • Wiggle harness and actuator while monitoring for intermittent changes
  • Inspect vacuum/boost hoses and turbo actuator for mechanical faults

Signal parameters

  • Control method: ECM typically supplies battery voltage to solenoid; solenoid is switched to ground (ECM PWM) — expect a PWM waveform when active
  • With solenoid connected and system idle: back-probed control pin may show near battery voltage when OFF and pulsed to ground when ON
  • Typical solenoid coil DC resistance usually in the low tens of ohms (commonly ~10–40 ohms) — verify with factory spec
  • If circuit is 'high' the ECM sees voltage above expected threshold (possible constant ~12 V or stuck-high PWM)
  • Always confirm exact voltages, duty cycles and resistances against the vehicle's service manual

Diagnostic algorithm

  1. Confirm P0048 and note any accompanying DTCs (turbo, MAP, MAF, CAN).
  2. Visually inspect the boost solenoid, connector and harness for damage, corrosion or signs of heat/shorts.
  3. With ignition ON (engine OFF) backprobe the solenoid connector: identify control and supply pins from wiring diagram and measure voltage to ground.
  4. Measure DC resistance of the solenoid coil with connector disconnected. Compare to spec; infinite/open or very low/short indicates faulty solenoid.
  5. Monitor control signal with an oscilloscope or DVOM while commanding boost control (observing PWM). Look for correct switching and duty cycle changes.
  6. If constant battery voltage is present on the control terminal (no switching), isolate wiring: disconnect solenoid and check for battery voltage on circuit — if present the harness is shorted to battery or ECM stuck-high.
  7. Check continuity from solenoid connector to ECM pin and for shorts to battery/ground. Repair any wiring faults.
  8. If wiring and solenoid test good, suspect ECM driver fault. Confirm with bench test or consult dealer-level diagnostics before replacing ECM.
  9. After repairs, clear codes and perform road test under load to confirm normal boost control and no recurrence of P0048.

Likely causes

  • Pinched or chafed wire contacting constant 12V
  • Connector corrosion allowing high resistance and false readings
  • Failed solenoid coil with internal short to battery
  • ECM output transistor failed and stuck high
  • Recent service or modifications where wiring was disturbed

Fault status

⚠️ Status
Boost control solenoid circuit voltage higher than expected (circuit 'high'). Likely causes: short to battery, faulty solenoid, connector/wiring issue, or ECM driver fault. Intermittent or continuous boost control loss may occur.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

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