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.
Other Duramax LLY problems included the following:
Head gasket failure.
Injector harness chafing.
Water pump failure.
EGR valve issues.
Glow plug failure.
Fuel pressure relief valve.
Lack of factory lift pump.
How many miles will a 6.6 L Duramax last?
Overall, a properly cared for Duramax engine should last over 300,000 miles. However, consumers report having Duramax’s lasting in the 500,000-mile range!
What year Duramax is most reliable?
The safest Duramax model years you can buy are the models produced from 2011 to 2021. These include the Duramax LGH, Duramax LML, Duramax XLD25, Duramax XLD28, Duramax LWN, Duramax L5P, and Duramax LM2. These engines go a step further to provide better emissions thanks to a diesel exhaust fluid/urea injection feature.
The Duramax leads with horsepower, but the Cummins is the king of torque with numbers up to 1,000 ft-lbs depending on the truck.
Is Powerstroke better than Duramax?
Both the Ram’s Cummins (seen above) and Ford’s Power Stroke can pull over that amount, but the Duramax lags with a total towing capacity of 23,300. The Power Stroke wins here again with a total towing amount of 34,000 pounds versus Ram’s 31,210 pounds.
What is the most reliable diesel ever?
The Most Reliable Diesel Trucks of All Time
1999-2003 Ford F-250/F-350 Super Duty (7.3-Liter Power Stroke)
2001-2004 Chevrolet Silverado/GMC Sierra 2500/3500 (6.6-Liter Duramax LB7)
2006-2007 Chevrolet Silverado/GMC Sierra (6.6-Liter Duramax LBZ)
What is the most reliable diesel truck on the market?
Here are the three most reliable diesel pickup trucks of all time.
a 2021 Silverado 3500 diesel | Chevrolet.
1999 Ford F-350 | Wikimedia Commons.
1998 Dodge Ram 2500 | Wikimedia.
Is 200 000 miles alot for a Duramax?
Even when used extensively for towing and hauling, Powerstroke, Cummins and Duramax diesel trucks typically last well beyond 100,000 miles. Because of that, it’s not uncommon to see diesel pickups with 200,000 and even 300,000 miles commanding good resale values on the used truck market.
What year Duramax has fuel pump problems?
Although the Duramax engine has had massive success since its inception, the 2011-2016 edition brought about controversy. This edition, which was fitted with the CP4 pump, suffered from high-pressure fuel pump complications.
The Cause of the CP4 Failures: Lack of Lubricity in the Fuel
The Bosch CP4 fuel pump has an unusually high failure rate in the U.S., upwards of 7%, when compared to 1% failure rate in Europe.
What is the break in period for a Duramax diesel?
What the owner’s manual says, nothing about “don’t go over XXmph, do not drive a constant speed fast or slow for 500 miles (salesman said no cruise control), no full throttle starts, do not downshift to slow the pickup. Avoid hard stops for 200 miles to seat brakes, do not tow trailer during break in.
What year did Duramax stop using CP4 pump?
The CP4 was standard equipment on the 2011-present Ford 6.7L Powerstroke. From 2011-2016 GM also used the CP4 in the LML & LGH Duramax engines, switching to the Denso HP4 in 2017 when the L5P was released.
Does GM cover CP4 failure?
What is more, the “repair” cost for a catastrophic CP4 failure is frequently upwards of $10,000, a cost which GM will not cover under warranty by blaming “fuel contamination” — contamination which is caused by the shredding CP4 itself.
Did GM recall the CP4 pump?
In the meantime, a massive recall was announced for CP4.2-equipped ’19 and ’20 trucks on November 12, 2021. According to the NHTSA at the time of the initial report, the recall applied to Ram’s 2500, 3500, 4500 and 5500 series trucks, and 222,410 units were affected in total.
Is there a recall on CP4 pump?
FCA has issued a widespread recall of the infamous CP4 injection pump, utilized on the 2019-2020 Ram 2500 and 3500 with the 6.7 Cummins diesel engine. Unfortunately, they don’t have parts available to FIX the trucks!
As you may have already guessed, the cost of a CP4. 2 failure can be expensive. Repairs can range from $6,000 to $10,000 depending on what is replaced (vs. cleaned and reused) and who handles the work.
How do you know when CP4 fails?
Do CP4 disaster kits work?
Since its debut in 2016, the original S&S 6.7L Power Stroke CP4 Bypass Kit (Disaster Prevention Kit) has safeguarded thousands of injectors from CP4 debris. In fact, it works so well that it has been copied by multiple opportunists within the aftermarket.
Is CP3 or CP4 better?
Should one decide to “tune” the engine, a CP3 can support more horsepower than the CP4 because of the higher fuel volume it’s able to feed the injectors. The CP4. 2 is said to support fuel for only about 525 horsepower, while a CP3 can support up to 800 horsepower.