Failed wastegate solenoid (open or shorted coil); Damaged or disconnected electrical connector at the solenoid; Broken, corroded, or shorted wiring in the solenoid circuit; Vacuum hose leaks or blockages between the solenoid and wastegate actuator; Sticking or seized wastegate actuator linkage; Faulty PCM driver circuit (rare)

DTC codes / Mitsubishi codes / P1104

P1104 · MitsubishiTurbocharger Wastegate Solenoid

Q: What does code P1104 mean?

Turbocharger Wastegate Solenoid. P1104 on Mitsubishi vehicles indicates the powertrain control module (PCM) has detected an electrical fault in the turbocharger wastegate solenoid circuit, which controls boost pressure by opening the wastegate. The PCM monitors the solenoid's command and feedback circuits and sets this code when the current or voltage falls outside the expected range for the commanded duty cycle.

P1104 on Mitsubishi vehicles indicates the powertrain control module (PCM) has detected an electrical fault in the turbocharger wastegate solenoid circuit, which controls boost pressure by opening the wastegate. The PCM monitors the solenoid's command and feedback circuits and sets this code when the current or voltage falls outside the expected range for the commanded duty cycle.

SystemPowertrain

Code typeMitsubishi specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Reduced engine power or limp mode due to overboost protection
Poor acceleration or sluggish throttle response
Decreased fuel economy
Audible hissing or whistling from the turbocharger area under boost
Rough idle or stumbling in some cases

Common causes, most likely first

Failed wastegate solenoid (open or shorted coil)
Damaged or disconnected electrical connector at the solenoid
Broken, corroded, or shorted wiring in the solenoid circuit
Vacuum hose leaks or blockages between the solenoid and wastegate actuator
Sticking or seized wastegate actuator linkage
Faulty PCM driver circuit (rare)

How to diagnose and fix it

Scan all modules for stored codes and record freeze-frame data to confirm P1104 is active
Visually inspect the wastegate solenoid, connector, and vacuum hoses for damage or disconnection
Test the solenoid resistance with a multimeter and compare to specification
Check for battery voltage and ground at the solenoid connector with the key on
Perform a bidirectional actuator test with a scan tool to command the solenoid and listen for operation
Repair or replace faulty wiring, hoses, or the solenoid as needed
Clear codes and verify the repair with a road test under boost

Wastegate solenoid diagnostics beyond the code

A stuck-open wastegate can mimic a solenoid failure by causing low boost and setting P1104, so always check actuator movement before replacing parts.
Corroded pins in the solenoid connector are a common cause on older Mitsubishi models, especially in humid climates, and can be fixed without a new solenoid.
The PCM may set P1104 intermittently if the solenoid coil is failing only when hot, so test the solenoid both cold and after a drive cycle.
Vacuum leaks upstream of the solenoid can cause the PCM to see unexpected feedback and set this code even when the solenoid itself is good.
After repairs, some Mitsubishi models require a relearn procedure for the wastegate actuator using a factory scan tool to restore proper boost control.

Can I keep driving with P1104?

You can usually drive the vehicle with P1104 set, but avoid aggressive acceleration and sustained high boost because the turbo may overboost or underboost, potentially causing engine damage. Have the fault diagnosed soon to prevent worsening performance and possible secondary failures.

Tools that help

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Guidance is general and written for Mitsubishi vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.