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  1. Duramax Seventh Generation: 2020+ (L5P)
    I have a 2020 GMC 1 ton Denali with around 27K on it. While pulling my RV to Florida, I got a check engine light. I pulled into a car parts store and they read the code. It was on cylinder #5 and it said the cylinder was excessively retarded. I cleared the code. No more codes the rest of...
  2. Duramax Fifth Generation: 2011-2016 (LML)
    I fuel up at a diesel pump at a Walmart gas station, drove approx 25 miles home then 5 miles to meet a friend. sitting with AC on, engine just stops and will not restart. this was on Thursday. Could not get a tow until Friday morning, took it to a local dealer. Dealer got to it on Monday and...
  3. Any Other Vehicles
    Hey everyone i was wondering what can cause low fuel pressure. My truck is a 2006 2500 5.9L and hasn't started in about 2 weeks. batteries are fully charged. Here is what I have replaced --> Fuel Pump Fuel Filter Pressure Relief Valve Heating Grid Intake Heating Relay Injectors and Tubes...
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