P3660high severityPowertrain
GDI Piezoelectric Injector Driver Circuit Fault
on 2010 Audi TT 3.2L V6 · AWD
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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