Hard cold starts, extra cranking, or a glow plug code on your Duramax usually means one or more plugs have worn out. The Bosch 0250403031 is a new direct-fit glow plug for 2006-2016 6.6L Duramax LBZ, LMM and LML engines in Chevy Silverado and GMC Sierra 2500/3500 trucks.

It is sold as a single plug, and these engines use eight. If one has failed, the rest are often close behind, so many owners replace all eight at once for even cold-start heat.

What you get:

• One new Bosch 0250403031 glow plug
• Direct-fit replacement for GM 12639701
• Fits 2006-2016 6.6L Duramax LBZ, LMM and LML
• Also listed for 2009-2016 Chevy Express and GMC Savana 4500 with the 6.6L diesel
• Quantity per engine: 8

Specs:

• Part number: Bosch 0250403031
• Cross-reference: GM 12639701, Standard GP114
• Thread size: 10 mm
• Hex size: 12 mm
• Reach: 28 mm
• Overall length: 142.7 mm (5.62 in)
• Seat type: tapered
• Element: Inconel sheathed single coil
• Preheat time: about 4 seconds

A good fit for anyone replacing worn plugs or chasing a glow plug code on a 2006-2016 Duramax. Match your OE number and order. Verify fitment for your truck before ordering.