The LLY engine uses a glow plug system with a control module operated by the glow plug control module (GPCM). The GPCM connects to each of the eight glow plugs individually.

The LBZ solved a lot of problems that plagued previous Duramax engines, but one notable issue did carry over from its LLY predecessor. A fault with the glow plug module would cause the glow plugs ...

Some units of the 2020 GMC Sierra 1500 pickup truck motivated by the 3.0L LM2 turbo-diesel Duramax engine may have a faulty cylinder 2 glow plug that can cause issues, according to a special ...