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P1244

Wastegate Control Solenoid Valve Malfunction Low Input.

  • Subaru
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
2
AreaFuel and air metering (injector circuit)
44
FaultThe specific fault in that area

What it means

On Subaru turbo models, P1244 means the engine control unit has detected a low voltage or low input condition in the wastegate control solenoid valve circuit. The ECU commands the solenoid to regulate boost pressure and monitors the circuit. When the signal reads lower than expected, usually through a short to earth or a wiring fault, it logs the code and may restrict boost.

Symptoms

  • Check engine light on
  • Loss of power or flat acceleration under load
  • Boost lower than normal or no boost
  • Possible overboost or erratic boost delivery
  • Car may enter a reduced power mode
  • Turbo whistle or wastegate rattle noises in some cases

Possible causes

  • Faulty wastegate control solenoid valve (internal short or coil failure)likely
  • Damaged, chafed or shorted wiring to the solenoid, especially near hot engine componentslikely
  • Corroded, loose or water-damaged connector at the solenoid or ECUpossible
  • Cracked, split or disconnected boost control vacuum or pressure hoses affecting solenoid operationpossible
  • Blocked or sticking solenoid due to dirt or oil contaminationpossible
  • Faulty engine control unit driver circuitrare

How to diagnose

  1. Read all stored codes and freeze frame data, noting load, rpm and temperature when the fault set, then clear and see if it returns.
  2. Visually inspect the wastegate control solenoid, its connector and the wiring loom for chafing, heat damage, oil contamination and corrosion.
  3. Check the boost control hoses for splits, perishing, loose fittings and correct routing for your model.
  4. Measure the solenoid coil resistance and compare it with the manufacturer specification for your model and engine.
  5. Check the solenoid supply voltage and the ECU control signal using a multimeter or oscilloscope with the ignition on.
  6. Test the wiring between solenoid and ECU for short to earth, open circuit and high resistance.
  7. Command the solenoid using a bidirectional scan function if available and listen or feel for operation.
  8. Check actual boost against target with a live data log or boost gauge, and test the wastegate actuator for free movement.

How to fix

  • Replace the wastegate control solenoid valve if its resistance or operation is out of specification.
  • Repair or replace damaged wiring and secure the loom away from heat and sharp edges.
  • Clean or replace corroded connectors and terminals.
  • Replace split, loose or incorrectly routed boost control hoses.
  • Free or replace a sticking wastegate actuator if it is binding.
  • Diagnose and repair or replace the ECU only after all wiring and the solenoid have been proven good.

Can I keep driving?

Medium severity

The car can usually be driven gently for a short time, but avoid heavy throttle because uncontrolled boost may harm the engine or turbo. Get it checked soon.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

This code for other makes

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