P25EC
Supercharger Disconnect Clutch Circuit Low
Voltage on the supercharger clutch control line is below the expected window. Usually a short to ground or a shorted clutch coil.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Common causes
Ordered by how often each turns out to be the cause.
- Control wire shorted to groundCommon
- Internal short in the clutch coilPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Supercharger Clutch
- Clutch Solenoid
- Wiring Harness
P25EC is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.