Well, the 6.7 Cummins has been on top of the list for its enormous horsepower, top-class torque, and wonderful towing experience. However, like all other engines, the 6.7 Cummins also has its shortcomings.
Even though some problems are manageable, it is better to avoid some certain year 6.7 Cummins to stay on the safe side. And the surprising fact is that the introducing year model- 2007 is the first to avoid.
Read on to know more about 6.7 Cummins engine problems and the years you should ignore.
3 Worst 6.7 Cummins Years to Avoid
6.7 Cummins provides more power and updated features than its predecessors. Its 400 horsepower and 1000 pound-feet of torque make the diesel Cummins trucks a favorite of automotive enthusiasts.
Despite its outstanding specs and popularity, some lacking was marked in certain year model of 6.7 Cummins engine. Most of the problems are caused by the emission parts.
However, cutting the edge, we are here to warn you of the worst one with the red flag. So, let’s have a look at the worst 6.7 Cummins years and what earned them this tag.
Why Avoid 2007 6.7L Dodge Diesel Cummins
6.7 Cummins engine was first introduced in 2007 by Dodge RAM trucks. Its inline-six turbo diesel engine, direct injection, VGT, and EGR made it an instant hit.
But soon, it was followed by reliability issues. With a great number of unsatisfied customers, plenty of warranty claims were made before Dodge updated the engine.
Disturbance in steering control is one of the issues that make the 2007 models undesirable. Problems with the front end, failure of the tie rod, and drag link are the most common ones in this aspect.
Various kinds of engine problems were reported for 2007 6.7 Cummins. Oil leaking was one of the most common issues. Other issues included check engine lights going on without any reason, reduced power, and in many cases, engine failure.
Electrical problems like voltage issue, cranks, and failing to start were noticed in 2007 Cummins engines.
Emission system problems are the most noteworthy ones in 6.7 Cummins of 2007. 6.7 Cummins included EGR (Exhaust Gas Recirculation) and DPF (Diesel Particulate Filter). These two emission systems can cause severe damage to the engine and can send the vehicle into limp mode, which cannot be sorted without repair.
Why Avoid 2008 6.7L Cummins
2008 6.7 Cummins had almost the same issues as the previous years. But the complaints increased by a great number.
A few more issues were identified along with steering, engine, electrical, and emission system problems.
Why Avoid 2011 6.7L Cummins
You should try to avoid the 2011 model 6.7 Cummins for its severe engine issues. DPF(Diesel Particular Clogging) and turbocharger issues are always on the recalls. Cummins Forum is the proof you can find for the Dodge Cummins DPF problems.
Common Issues of 6.7 Cummins Engine
Some common issues can come up anytime if you have a 6.7 Cummins. Let’s have a look at them.
DPF clogging is one of the most common issues of the 6.7 Cummins engine. Clogged soots and particles cause a back-pressure build-up in the engine. This problem can be identified with symptoms like long crank noises, reduced power, power loss, and fault engine codes.
EGR cooler problem is a common one for diesel trucks of high mileage. It is a good idea to clean up the EGR to solve the problem. However, many people simply delete the EGR for better durability despite the act being illegal. However, you might need to know about 6.7 Cummins throttle position sensor problems and their reasons.
Although it’s common for diesel trucks to have fuel dilution, 6.7 Cummins shows an excessive amount in this case. This can hinder the lubrication process and cause damage to the internal engine. A regular check-up can help prevent issues that may be caused by fuel dilution.
Turbocharger problems are very common with the 6.7 Cummins engine. Turbochargers can get damaged with time and create issues like oil leakage, worn-out bearings, damaged turbine wheel, etc. Slow spool, too much exhaust smoke, and weird noises are some symptoms that indicate the problem.
Not so common, but 6.7 Cummins can have its head gasket blown up because of the high cylinder pressure. A blown-up head gasket will show the symptoms like a sweat smell, white smoke, mixed coolant and oil, and overheating.
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Frequently Asked Questions (FAQs)
What problems does the 6.7 Cummins have?
6.7 Cummins problems are mostly emission system related, such as problems with the DPF and EGR. However, 6.7 Cummins can also have problems with the turbocharger, head gasket, and fuel dilution. Knowing which 6.7 Cummins years to avoid can help you from facing these troubles.
What’s the life expectancy of a 6.7 Cummins?
The life expectancy of your 6.7 Cummins hugely depends on your truck’s state and driving style. Generally, a 6.7 Cummins can last from 250,000 miles to 350,000 miles.
What are the best years of Cummins diesel?
The best years of Cummins diesel are 1996-1998, 2006, and 2019. These years have received the fewest issue reports. They also have a high reliability rate.
6.7 Cummins is one of the most powerful engines available to this date. Mostly used in heavy-duty trucks, 6.7 Cummins is popular for its extraordinary power and torque.
For its high-profile features, 6.7 Cummins surpasses the previous models. The EGR- Exhaust Gas Recirculation and VGT- Variable Geometry Turbocharger are added to the 6.7 Cummins engine to improve things.
Although certain years seem to be a bit more problematic, if you know which 6.7 Cummins years to avoid you can choose your desired 6.7 Cummins without any worry; as you can see on the later year models, 6.7L Cummins has been equipped with such parts to minimize those reported issues.
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