Keep your automatic transmission shifting on command with the Standard Ignition Automatic Transmission Control Solenoid (MPN TCS304). This electro-hydraulic solenoid takes an electrical signal and moves its pintle to block or vent transmission fluid pressure, controlling flow within the valve body. It installs as a direct-fit replacement for the 2002-2009 Chevrolet Trailblazer, 2002-2009 GMC Envoy, 2002-2004 Oldsmobile Bravada, 2003-2007 Hummer H2, 2004-2007 Buick Rainier, 2006-2010 Hummer H3, and 2009-2010 Hummer H3T — see the Buyer's Guide tab for engine-level details.
- 100% copper winding: delivers positive valve actuation on command.
- Precision-ground pintle: moves freely to block or vent fluid pressure.
- Matched to OE: resistance and inductance matched to OE for proper fit, form and function.
- Stainless steel filter screen: helps prevent contamination of the valve components.
Signs the original solenoid may need replacing include harsh, delayed, or erratic shifts and a transmission-related trouble code. Diagnose the cause before replacing; if a failed control solenoid is the cause, this unit replaces it.
Interchange: TCS227 · TCS847 · 88967140
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does this transmission control solenoid do?
It converts an electrical signal into mechanical movement, shifting its pintle to block or vent transmission fluid pressure and control flow inside the valve body.
Will this fit my vehicle?
It's a direct-fit replacement for applications like the 2002-2009 Chevrolet Trailblazer, 2002-2009 GMC Envoy, 2003-2007 Hummer H2, and more. Check the Buyer's Guide tab to confirm your vehicle.
What are the signs of a failing control solenoid?
Common signs include harsh, delayed, or erratic shifting and a transmission-related trouble code. Diagnose the cause before replacing, since other parts can produce these symptoms.
What numbers does this part interchange with?
It cross-references TCS227, TCS847, and 88967140. Matching any of these numbers helps confirm this is the correct replacement solenoid.
Does it include a filter screen?
Yes. It features a stainless steel filter screen that helps prevent contamination of the valve components.
Write a Review