Bosch 0250403031 Diesel Glow Plug

Bosch Diesel Glow Plug 0250403031

Bosch Diesel Glow Plug 0250403031 is a direct-fit diesel glow plug engineered for Chevrolet and GMC heavy-duty diesel applications. It uses Bosch Duraterm dual-control coil technology to shorten glow time and support faster cold starts, with stable heat regulation for post-glow operation.

Key Features

• Bosch Diesel Glow Plug line with Duraterm dual-control coil design
• Self-regulating heating system reduces glow wait time by more than 50%
• Inconel construction for high-temperature durability
• Threaded terminal, tapered seat, and 10 mm thread diameter
• 4.0 second pre-heating time for quicker engine start-up
• 5.61811 in total length with 28.0 glow plug reach

Product Details

The Bosch Diesel Glow Plug 0250403031 is built for diesel engines that rely on fast, controlled pre-heating for reliable ignition in cold conditions. Bosch’s dual heating and regulating coil design manages current flow efficiently, allowing the glow plug to reach operating temperature quickly while supporting a more consistent post-glow phase. This makes it a practical OE-style replacement for Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, and GMC Sierra 3500 HD diesel applications, along with Express and Savana diesel vans.

This part cross-references 12639701 for the same application.

What It Helps Address

• Hard starting in cold weather
• Extended crank time before the engine fires
• Rough diesel startup after overnight parking
• Glow plug circuit performance issues caused by worn heating elements
• Uneven pre-heating in diesel combustion chambers

Installation Notes and Tips

Verify thread diameter, reach, seat type, and terminal style before installation. This Bosch Diesel Glow Plug 0250403031 uses a threaded terminal and tapered seat, so matching the OE-style specifications is important for proper fitment and heat transfer. Confirm vehicle application by year, make, and model before service on Chevrolet Express 2500, Chevrolet Express 3500, Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Savana 2500, GMC Savana 3500, GMC Sierra 2500 HD, and GMC Sierra 3500 HD diesel engines.

Quality Assurance

Bosch brings long-standing diesel fuel-injection and glow plug engineering experience to this part line. The Duraterm design is built around controlled heating and regulated current flow for consistent diesel starting performance.