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June 17, 2022 Although the 6.6-liter Duramax is sometimes called the best diesel engine in the Chevy lineup, we often get bad reviews and opinions from very irritated owners. We've decided to write a full article describing the most common issues and problems your Duramax diesel engine may have.
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Duramax 6.6 Technical. Duramax Hard Parts. L5P . 1; 2; Next. 1 of 2. They started building mine this week. I really want this truck but if the problems persist I'll pass on it. NC-smokinlmm << The most common problem with the water pump in the Duramax diesel 6.6L engine is total failure, and this spells serious trouble for you. We won't candy-coat it, the water pump's design is flawed. Consequently, you'll likely need a new water pump after 80,000 to 100,000 miles of driving. #1 ยท Jan 29, 2021 Severe gas mileage issues. My 2019 with same 6.6L engine got 26mpg hwy 19 mpg cityand had 8 speed trans. Brand new 2021 2500hd diesel gets 16mpg hwy and 13 city with the 10 speed Alision. Seems like it doesn't go over 6th gear. I tested with rpm gauge at 60 mph on flat highway in Drive. The 6.6-liter GM Duramax diesel engine has been a proven winner for heavy-duty trucks. But there are common problems that san the life of the engine. by Thom Taylor Published on May 26, 2022 3 min read The Chevy/GMC Duramax 6.6-liter diesel engine has proven to be a powerful and reliable workhorse since introduced in 2001. 1. Snapped Crankshaft Perhaps the most devastating of all Duramax failures is a broken factory crankshaft. Not only does this mean game-over for the engine, but it results in a truck that's down for weeks (if not months) and a huge chunk of change missing from your wallet. The Detroit News reports that GM is now facing a class-action suit alleging its 6.6-liter Duramax engine found in 2011-2016 Chevrolet and GMC models is not compatible with US diesel fuel. You'll also experience loss of power, excessive smoke, rough idling, and engine misfiring. Signs of Bad LB7 Duramax Injectors Here are common issues experienced when you have bad injectors. Excessive/Constant Smoke when Idling Hard Starts Fuel in Oil. Check Dipstick look for a surplus of oil or even smell the dipstick. 1) CP4.2 Injection Pump Failure Duramax "upgraded" the injection pump for the LML models, going from the Bosch CP3 to the CP4.2. The new CP4.2 pump actually flowed 20% less fuel than the CP3. This makes the CP4.2 highly incapable of handling additional horsepower without the addition of a lift pump. The following are other common problems with the 6.6 Duramax reported over several generations of the engine: Water Pump Failure: This problem was most commonly reported in the LLY and LB7 series that came out between 2004 and 2005. To fix this problem, a larger water pump was designed and fitted in the 2006 model. Six Problems Often Found in Duramax 6.6L Engines Duramax Engines have an excellent reputation for reliability. Each model year is associated with problems, especially when the engines reach 100,000+ miles. However, while Cummins engines may continue to edge out Duramax in terms of overall reliability, Duramax fans love their higher horsepower. Just the 2006 LLY was a detuned LBZ. Now it is different from the 2004.5 to 2005 LLY. Different generation completely. In 2006 CanBus interface was the standard for the OBDII interface.\. Brian. 2007.5 GMT-900 Chevrolet Silverado 2500HD CC/LB LTZ 4x4 Summit White. 4-18-2007. Powered by the LMM Duramax 365hp/660tq coupled to the MW7 Allison 1000. 2020 duramax. I just bought a 2020 Gmc 2500 Denali with the 6.6 duramax I've put about 3000 miles on it and noticed a knock noise it sounds just like a main bearing knocking so I brought in to let the dealership look at it and there telling me that the knocking sound is coming from the return oil pump and that is normal. Written By: Lawrence "LT" Tolman Whether you currently own a 6.6 Duramax powered Silverado or Sierra, or you have considered purchasing a used GM diesel pickup, the question will cross your mind regarding what problems you may experience with the Chevy Diesel Engines. The 6.6-liter Duramax diesel engine is one of the main motors you will find in General Motors (GM) trucks. While these engines are extremely durable and reliable, they do have some problems. Here are some common Duramax diesel engine problems and what can be done to fix them. Most Common 6.6-liter Duramax Problems 1. Issues With the Fuel Lift Pump The 6.6-liter "DMAX," as it's commonly referred to by owners, stood strong against the competition from its debut in May 2001 through October 2016, when it was replaced by the all-new.[WTS] 2003 Chevy 2500HD Duramax Diesel 6.6 LB7 CLEAN River Daves Place
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