Built to open and close on command inside your Subaru's automatic transmission, the Standard Ignition Transmission Control Solenoid TCS278 is a direct-fit replacement for the 1998-2008 Subaru Forester, 2000-2006 Subaru Legacy and 2002-2007 Subaru Impreza. See the Buyer's Guide tab for engine-specific details.
This automatic transmission control solenoid is an electrically actuated valve. When the transmission control system commands it, the solenoid moves to block or vent fluid pressure.
- 100% copper winding: designed for positive valve actuation whenever the solenoid is commanded.
- Precision-ground pintle: moves freely to block or vent fluid pressure.
- OE-matched electrical specs: resistance and inductance are matched to OE for proper fit, form and function.
- Stainless steel filter screen: helps keep contamination away from the valve components.
Standard Ignition is a global manufacturer and keeps full quality control over every stage of production.
Signs a transmission control solenoid may need replacing include harsh or delayed shifts, erratic shifting, the transmission staying in one gear, or a check engine light with transmission-related codes. Low or contaminated fluid, wiring faults and other internal problems can cause the same symptoms, so diagnose the cause before you replace the solenoid.
Interchange: TCS201 · TCS821 · 31939AA111
This part cross-references / interchanges with the following part numbers:
TCS201, TCS821, TCS278, 31939AA111
