GM knows they have a problem with the glow plugs on the L5P duramax, they are giving extended warranties on the 18 and 19 model year trucks the 17 year should be included also because of the same part failing on the 17 model year. Have had dealer repair & replace 3 within 18,000 miles so the problem is also on the 17 model year trucks also, GM needs to include the 17 and any model year trucks where this is occurring.