Champion 401 Spark Plug

Champion Copper Plus 401 Spark Plug

Champion Copper Plus 401 is a replacement spark plug built for dependable ignition performance and consistent heat control. Its copper core electrode helps improve conductivity, while the nickel center and ground electrode materials support steady wear characteristics for everyday driving.

Key Features

• Copper core electrode for improved conductivity and heat management
• Nickel center electrode tip and nickel ground electrode core material
• Pre-gapped to 0.040 inch for RS12YC applications
• Resistor type spark plug for ignition system noise control
• Tapered seat design with a removable nut terminal
• Champion Copper Plus classification, part number 401

Product Details

The Champion Copper Plus line focuses on practical, OE-style ignition service with a copper core design that supports reliable spark delivery and controlled operating temperatures. Part number 401 is identified as RS12YC and is used across a wide range of domestic vehicles, including Chevrolet Silverado 1500, GMC Sierra 1500, and Ford F-150 applications. It also appears in fitments for Chevrolet Express, GMC Savana, Cadillac Escalade, and other GM and Ford platforms.

This part cross-references Autolite (e.g., 104, 605) for the same application.

What It Helps Address

• Hard starting caused by worn or inconsistent spark plugs
• Rough idle from weak ignition output
• Misfire conditions tied to plug wear or incorrect gap
• Reduced throttle response from degraded spark delivery
• Heat-related plug wear in high-mileage service

Installation Notes and Tips

Verify the vehicle’s required plug type, thread diameter, reach, and seat style before installation. This plug is pre-gapped to 0.040 inch, but the final gap should always be checked against the service specification for the exact application. Confirm the removable nut terminal matches the ignition lead or coil-on-plug setup, and inspect the threads and sealing surface during service.

Compatible fitment includes 2001-2019 Chevrolet Silverado 2500 HD, 2000-2014 Chevrolet Tahoe, 1997-2013 Ford F-150, and 2000-2014 GMC Yukon, with additional coverage across many Chevrolet, GMC, Cadillac, Ford, Mazda, Mercury, and related models listed in the fitment data.

Quality Assurance

Champion Copper Plus spark plugs are built around a copper core design for conductivity and heat control, with nickel electrode materials selected for dependable everyday service. Part number 401 is engineered to match RS12YC applications and support consistent ignition performance across a broad vehicle range.