Standard Ignition GP124 Diesel Glow Plug

Diesel Glow Plug for GM HD Trucks

Standard Ignition GP124 is a direct-fit diesel glow plug for select Chevrolet Silverado 2500 HD, Silverado 3500 HD, GMC Sierra 2500 HD, and Sierra 3500 HD applications. It is built with high-quality materials to handle demanding diesel operating conditions and support reliable cold-start performance.

Key Features

• Direct-fit OE replacement for straightforward installation
• Functions as a diesel glow plug for cold-start combustion support
• Built with materials suited for extreme engine bay conditions
• Made under complete quality control throughout manufacturing
• Fits 2017-2023 Chevrolet Silverado 2500 HD and Silverado 3500 HD
• Fits 2017-2023 GMC Sierra 2500 HD and Sierra 3500 HD

Detailed Description

Standard Ignition GP124 is engineered as an OE-style replacement glow plug for GM heavy-duty diesel trucks. If you are searching for a diesel glow plug for a 2017-2023 Chevrolet Silverado 2500 HD or a 2017-2023 GMC Sierra 3500 HD, this part provides the direct-fit design needed for service work and routine maintenance. This part cross-references Dorman - HELP 21135 for the same application.

The GP124 part number is also listed with interchange references 12666880 and GLW105, helping confirm application matching during parts lookup. Standard Ignition applies controlled manufacturing processes to maintain consistent fit and function across the product line.

Common Issues It May Address

• Hard starting in cold weather
• Extended crank time on diesel engines
• Glow plug fault codes related to a failed unit
• Rough initial combustion after startup
• Service replacement for worn or damaged glow plugs

Installation Notes and Tips

Verify engine application and cylinder location before installation. Inspect the glow plug harness, connectors, and related control components for heat damage or corrosion before replacing the glow plug. Follow the vehicle service procedure for removal and torque specifications to reduce the risk of thread damage in the cylinder head. Confirm fitment for your Silverado 2500 HD, Silverado 3500 HD, Sierra 2500 HD, or Sierra 3500 HD before ordering GP124.

Quality Assurance

Standard Ignition states that this diesel glow plug is manufactured with complete quality control throughout the production process and uses materials intended to withstand severe operating conditions.