The best and worst years for 6.7 cummins

the most widely used diesel engines worldwide is the 6.7 Cummins. It is widely recognized for being exceedingly sturdy, resilient, and powerful.

This means that it is applied in a wide range of automobiles, pickup trucks, SUVs, and business trucks; however, now, they are all built equally.

Although there are best and worst years for 6.7 cummins, It would help if you stayed far away from the 6.7 Cummins engines made in 2009, 2011, 2014, and 2015, even though each operates differently based totally on usage and other variables. All of those engines have skilled troubles with turbochargers and DPF blockages. This turned into even a keep-in-mind for the 2011 model.

I’ll explain why you ought to live far away from those fashions, along with a few information on potential troubles they can pose to your vehicle. I’ll also give you a brief rundown of the 6.7 Cummins.

Worst years for 6.7 cummin

There are four cummins 6.7 engine to avoid

6.7 Cummins engine from 2011

2009 saw the debut of the 6.7L Cummins diesel within the Ram 2500 and 3500 pickup vans. Avoid the 2011 model year if you’re looking for a used vehicle with an excellent engine. This is a result of issues with this engine’s powertrain guarantee.

Due to many engine screw-ups in the 2011 model year brought on by injector issues, Chrysler and Cummins (the producer) have issued recollects.

Reasons To Avoid

The most prevalent topics in 2011 included:

  • DPF blockages.
  • Problems with the turbocharger.
  • issues with the head gasket.

These are all fixable but inconvenient problems. If any of these issues were discovered to have been present in your 6.7, find out more about the recall and check to see if your car was included.

DPF Clogged 

A vehicle’s engine may run rich when the diesel particulate filter (DPF) is clogged, which results in low fuel economy and mileage. Additionally, the exhaust system may have an increased chance of failure and excessive carbon buildup.

Clogged DPFs result in early DPF failure, which causes soot fragments to fall off and burn in your engine.

Picture a layer of unprocessed carbon on your engine’s air filter; heat causes the soot to burn, producing smoke. This damage might make your truck more difficult to drive and reduce its fuel efficiency by 30%.

Problems with the Turbocharger

Your 6.7 Cummins turbocharger may suddenly stop working, trapping you in the worst situation.

At most, fuel efficiency and engine performance might be impacted. In the worst case scenario, it can cause the engine to stall or even catch fire while you’re driving!

Issues with the Head Gasket

A problem with the head gasket can result in costly repairs and catastrophic engine failure. The purpose of the head gasket is to maintain proper coolant, oil, and exhaust flow between the engine head and block. The head gasket must be functional for your engine to operate as efficiently as possible.

Problems with the EGR Valve

There may be an issue with the EGR. This emissions device mixes exhaust gases with fresh air before the engine’s combustion chamber, which helps control fuel efficiency.

Carbon buildup can happen quickly if it fails, causing harm to the engine compartment.

Cummins 6.7 Engine, 2009,

Cummins Years To Avoid

Since the engine is in its first year, the 2007 Cummins 6.7L has a lot of issues. It is not worth purchasing because of its numerous problems and unreliability.

You will pay more for petrol with this engine than with most others because the engine itself isn’t very efficient.

Reasons To Avoid

The 2007 6.7 Cummins engine has the problems above and a few more that this initial variant experienced.

This includes issues with fuel dilution and a general lack of component availability because it is the first model with the 6.7 Cummins engine.

Issues with Fuel Dilution

One of the most frequent problems with diesel engines is fuel dilution. This is an issue since it may harm important engine parts and components.

“Pumping and kicking,” another term for dilution issues, are caused by blocked fuel filters, which allow fuel to back up in the lines and overflow the fuel pump.

6.7 Cummins engine from 2015

2015 Cummins Years To Avoid

Despite having excellent power and fuel efficiency, the 2015 6.7 Cummins engine is not the most dependable model year. While most of the difficulties are little and quickly resolved, there are a few big ones to be mindful of.

Reasons To Avoid

In addition to the problems listed above, you might experience the following in 2015:

  • issues with the fuel system.
  • Problems with the EGR valve.
  • Problems with the cooling system.

Once more, they are all fixable, but if you run into them, it can be quite expensive and time-consuming.

Issues with the Fuel System

Premature fuel filter failure, which frequently occurs within the first 50k miles (80,467 km), is another major problem reported by owners! In colder temperatures, this diesel issue is more severe.

However, other variables like poor maintenance or poor driving conditions (i.e., a lot of stop-and-go driving) might cause it to happen at any time of year.

Problems with the EGR Valve

Your engine receives exhaust fumes back through the EGR valve. In the event of a malfunction, your emissions may run high, resulting in expensive repairs and fines. Other problems with your Cummins truck engine could lead to EGR valve troubles.

Let’s say, for instance, that your turbocharger isn’t operating easily or giving the engine enough boost pressure. If so, you could force debris into the EGR valve. Your components will wear out more quickly, and a costly repair may be necessary.

Problems with the Cooling System

Owners of this truck frequently lament how fussy the cooling system seems to be. Several owners say they have problems heating up their trucks on warmer days. Some claim they have never experienced any issues with their cooling systems.
It’s unclear if this model year has a feature that makes it more prone to overheating or if technology developments have made it run hotter than previous models.

2014 Cummins 6.7 engine

2014 Cummins Years To Avoid

2014 6.7 Cummins has faced numerous problems. Along with the head gasket problems and turbocharger troubles, there have been issues with oil consumption.

If you’re considering purchasing a used 2014 Cummins, look for any warning indications of wear and tear and pay close attention to the mileage, as injector problems are especially prevalent with this model.

Reasons To Avoid

In addition to the problems listed above, your 2014 may include a potential “death wobble” appearance. In case you are unfamiliar, this commonly happens with Jeeps and Trucks. Additionally, diesel engines are known to be vulnerable to it.

The Death Wobble 

It’s known as a fatal wobble when your steering wheel begins to shake uncontrollably when you’re driving on uneven or bumpy roads, especially at speeds greater than sixty miles per hour (100 km/h). You must take your car to the mechanic right away if this happens!

Described: The 6.7 Cummins Engine

Cummins Years To Avoid

If you’re seeking to buy a secondhand truck with a 6.7 Cummins engine, there are some years that you must live far from. This engine is quite popular for Dodge and Ram pickups.

Additionally, there are positive issues to be aware of when shopping a secondhand 6.7 diesel truck. Even the 2023 models have issues,causing a recall

In 2007, the 6.7 Cummins engine made its debut. It became the first diesel engine with a turbocharger, a diesel particulate filter, and extra displacement.

It is widely recognized for being many of the most sturdy, powerful, and lengthy-lasting engines that Cummins has ever produced. Numerous automobiles, which include buses, lorries, vehicles, and farm gadgets like combines, have been geared up with a 6.7 Cummins engine.

First, compared to similar diesel engines like Ford’s Power Stroke or GMC’s Duramax diesel engines, the 6.7 Cummins is one of the most complex.

These engines are very hard to work on because of the numerous sensors and solenoids that adjust everything from gas transport to pollutants; the simplest shops in North America specialize in repairing these engines (one in Detroit, Michigan, and the other in South Carolina).

It will be very tough (and expensive) to find someone who can restore any problems you may have with your truck, especially if it leaks or clunks from the drivetrain or transmission unless they specialize in this upkeep.

It’s also essential to know that the 6.7 Cummins has numerous problems with early wear and failure. This results from the intricacy of those engines, which rent many sensors and solenoids and may be intricate if one malfunctions.

This results in difficulty with the engine’s operation, which later causes other issues.


When became the 6.7 Cummins engine first delivered?
The 6.7L Cummins engine become first brought in 2007, for model yr 2007.Five Ram vans.

Which are considered the high-quality years for a 6.7 Cummins engine?
Many diesel fans keep in mind the 2012-2013 models to be the great years for the 6.7 Cummins engine because of their robustness, performance, and comparatively low prevalence of commonplace problems.

What years are taken into consideration the worst for the 6.7 Cummins engine?
Generally, the 2007-2009 fashions are taken into consideration much less reliable due to a better prevalence of problems, inclusive of issues with the diesel particulate filter (DPF) and turbocharger.

Have the issues visible inside the worst years been resolved in recent models?
Yes, Cummins Inc. Has made numerous upgrades to the 6.7L engine over the years to address and rectify not unusual troubles.

What need to I search for if I’m considering a used 6.7 Cummins from the much less desired years?
Be vigilant for signs of common issues along with DPF or turbocharger troubles. Also, a thorough maintenance history may be very valuable.

Last Words

The amazing 6.7 Cummins engine has consistently been among the most resilient. It can tow large weights and is easily adaptable to increase in power.

But some years ought to be avoided because there’s a greater chance of failure because of design flaws or subpar quality control during manufacturing

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