P3660high severityPowertrain

GDI Piezoelectric Injector Driver Circuit Fault

on 2015 Kia Forte 1.8L I4 · FWD

What this code means

The piezoelectric fuel injector driver circuit has a fault. Piezo injectors use crystal stack expansion for ultra-fast, precise fuel delivery in advanced GDI systems.

Symptoms

Check Engine Light
Misfire on affected cylinder
Rough idle
Reduced power
Fuel smell from exhaust
Catalyst damage risk if prolonged

Common causes

Piezo driver circuit failure in PCM
Injector piezo stack degradation
Wiring open or short to injector
Connector pin corrosion
Injector capacitance out of range

Diagnostic steps

Test injector capacitance with specialized tool
Check driver circuit output waveform
Measure injector wiring resistance
Inspect connector for corrosion
Swap injectors between cylinders to confirm

Repair notes

Replace piezoelectric injector. PCM replacement if driver circuit is faulty. Piezo injectors require specialized diagnostic equipment and are not interchangeable with solenoid-type GDI injectors.

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