For many years, Dodge Cummins has been one of the most powerful engines in the automotive industry. The Dodge Ram motor powers the truck time and again and is at the core of its system. Consistent and powerful strength is what they offer. Dodge Cummins has many excellent versions, but some models need to be avoided.
Find the best Dodge Cummins years before investing in a vehicle powered by it. By using CoPilot, you can find the ideal Dodge Cummins model for your drive, ensuring that you avoid the wrong model and that you buy the right Dodge Cummins model. Your investment deserves the best.
Quick Answer – Avoid Dodge Cummins Year Models 1991, 1992, 1993, 1999, 2001, 2003, 2006, 2007, 2008, 2011
The Dodge Cummins engine powers the Dodge Ram since 1989. It’s been three decades of hard work – there’s bound to be a Dodge Cummins year or two. It is recommended that you avoid models made in 1991, 1992, 1993, 1999, 2001, 2003, 2006, 2007, 2008, and 2011.
During these years, many issues have arisen. Transmission failures, charging system problems, and electrical problems are a few of the most common. Any driver can find handling these inconvenient and expensive.
Dodge Cummins Generations by Year
Originally introduced in 1989, the Dodge Cummins is still in production today. The 2024 Dodge Cummins has gone through five generations since 1989.
Dodge Cummins generations by year are listed below:
1st Gen Cummins (1989-1993)
First-generation Dodge diesel engines were powered by the Cummins 5.9L 12-valve engine. Lightweight trucks usually use this engine. There are 160 horsepower and 400 pound-feet of torque available from the 5.9L Cummins engine. Cummins engines of this generation are fuel-efficient, achieving 20 to 25 miles per gallon.
2nd Gen Dodge Cummins (1994-2002)
There is also a 5.9L 12-valve engine available on the second-generation Dodge Cummins. This generation of Dodge is the first to feature the Bosch P7100 mechanical injection pump. The engine was also slightly modified from 1998 to 2002 by Dodge.
Cummins 24-valve engines and Bosch VP44 electrically controlled engines were introduced by Dodge at this time. This generation’s engine produces almost as much power as the first generation.
3rd Gen Dodge Ram Cummins (2003-2007)
There are many new features offered by Cummins in the third generation of engines. As a result of its reliable 5.9L 24-valve engine, modern technology, and spacious cabins, third-generation Cummins engines received high reliability ratings.
Rail technology and Mega Cab configuration are also included in the third-generation Dodge Cummins. Third-generation Dodge Cummins can, however, be problematic, so stay away from them. So, which 3rd gen Cummins years to avoid? There are many problems with the 2003, 2006, and 2007 Dodge Cummins, so stay away from these years. In contrast, the best years to buy a Cummins 3rd generation are 2004 and 2005. However, how reliable are Cummins 3rd generation engines?
The reliability and durability of 3rd generation Cummins make them reliable. The number of problems associated with third-generation Cummins model years is lower than that of older model years, even though it is recommended to avoid most of them. Other third-generation Cummins model years are avoided compared to the 2004 and 2005 models.
4th Generation Cummins (2007-2019)
The larger 6.7L Cummins engine was introduced by Dodge in mid-2007. Cummins’ fourth generation began in mid-2007. There are 370 horsepower and 800 lb-ft of torque produced by the larger 6.7L Cummins engine. Up to 17,600 pounds can be towed by this vehicle. There are some common problems with some fourth-generation Cummins as well, just as they are with some other Cummins generations.
So, which 4th gen Cummins years to avoid?
Is there a 4th generation Cummins year that should be avoidedummins are very problematic. Therefore, you should avoid these Cummins years of the 4th generation.
5th Gen Cummins Years (2020-Present)
The latest Cummins models are the fifth-generation. Cummins’ fifth generation has fewer problems and is highly reliable. There are 400 horsepower available from the 2020 6.7L I6 Cummins. As for the 2024 6.7L I6 Cummins, it is capable of producing up to 420 horsepower and 1,075 pound-feet of torque.
Worst Dodge Cummins Years to Avoid
Some Dodge Cummins model years are highly problematic, even though many have a good reputation. Hence, these model years are listed as the worst years for Dodge Cummins.
Dodge Cummins models with the worst reliability are as follows:
Following are the factors we considered when making the above list:
Here are the years and problems of each model:
1991-1993 Dodge Cummins
First generation Dodge Cummins were produced from 1989 to 1993. In terms of horsepower (160 hp), Dodge Cummins’ first generation diesel engine does not provide impressive performance. The popularity of these models was due to their exceptional torque (400 lb-ft), which was superior to any gas engine of the time.
Several issues plagued the 1991-1993 model years of the first generation. In these model years, handling problems, transmission issues, electrical system failures, and significant rust damage are the most common problems.
Dodge Cummins of the first generation should be avoided. They are outdated, have reliability concerns, lack modern features, and rust.
1999 Dodge Cummins
Dodge Cummins second-generation models were introduced in 1999. For the first year of this generation, Dodges were equipped with Cummins Turbo Diesels with 5.9L 12-valve displacement. Mid-98, however, Dodge introduced a Cummins Turbo Diesel engine, a 5.9L 24-valve unit.
With the automatic transmission, Dodge has improved the power output of this engine to 180 horsepower and 420 pounds-feet of torque. Despite the second generation Cummins’ stellar reliability reputation, there are some significant issues with the 1999 model year.
It is common to have fuel injector failures, lift pump failures, VP44 injection pump failures, electrical malfunctions, transmission malfunctions, and rust and corrosion issues with 1999 Dodge Cummins.
Cummins 1999 reliability is being affected by these problems. Due to its high repair costs, excessive maintenance requirements, and safety concerns, you should avoid the 1999 Dodge Cummins.
2003, 2006, and 2007 Dodge Cummins
There is a Cummins Diesel engine in the 2003 Dodge Cummins with a capacity of 5.9 liters 24-valve. This model year has a lot of problems with fuel injection, lift pumps, turbochargers, transmissions, and electrical problems.
There are several issues with the 2003 Dodge Cummins, so you should avoid it. It is very expensive to repair the injector and lift pump problems together. Reliability and performance of the 2003 Cummins are impacted by issues with the electrical system and turbocharger.
There are the same problems with the 2006 Dodge Cummins as with the 2003 Dodge Cummins. In addition to fuel system failures, high maintenance costs, steering and suspension problems, and turbocharger issues, these model years have additional problems.
The performance of the engine is greatly reduced as a result of these issues. The Dodge Cummins company introduced a new turbo diesel engine in 2007 with a 6.7L 24-valve capacity. Emission standards have been tightened for this engine. While the 2007 model year included several upgrades, it was plagued by some major problems.
2008 Dodge Cummins
Cummins Turbo Diesel engine with 24 valves powers the 2008 Dodge Cummins. With this model year, Dodge introduces a Diesel Particulate Filter (DPF) and Exhaust Gas Recirculation (EGR).
There are several problems with this model, which makes it on the avoid list. It is very common for this model year to have emission system issues such as clogged DPFs and faulty EGR systems.
2008 Cummins models also have problems with turbochargers, fuel systems, transmissions, and electrical systems.
2010-2013 Dodge Cummins
There are many modern features on the Dodge Cummins 2010-2013. Its problems, however, cannot be ignored, which is why these years are avoided.
Dodge Cummins 2010-2013 have the following most common problems:
Although these problems are not as severe as they were in earlier models, they still require costly repairs. It is very complex to manage emissions in the latest and fourth generation Dodge Cummins engines. This is why they are costly to repair when they malfunction.
Which Models of the Dodge Cummins Are Safe to Buy Used?
Several Dodge Cummins years should be avoided, but there are also some that are safe to buy used. Here are some options you may want to consider for this engine type.
These are the safest Dodge Cummins investments, according to motoraudit.com:
The engines listed here are among the best on the market among the years available.
You will still encounter problems with these recommended engines as you would with any other vehicle. Stability control and engine failure are among the most common issues. In spite of this, they occur less frequently during these years than during the Dodge Cummins years.
These years are among the best, so you can feel confident in your purchase. I would consider these years to be the most reliable.
Which Models of the Dodge Cummins Are Not Safe to Buy Used?
The above vehicles are all good choices if you want a Dodge Cummins-equipped vehicle. Here are some Dodge Cummins years to avoid. Your vehicle choice will be based on this information, whether you’re heading to work or moving your family around.
These are some of the worst Dodge Cummins used options according to motoraudit.com:
If you want to power your car with a reliable engine, steer clear of these units.
While it’s hard to pinpoint the worst year, if you must drive one of these engines, better to go with a newer model. Dodge Cummins with older engines tend to have more faults than those with newer engines.
You should avoid older generations because they lack sophistication and require constant repair. It’s better to invest in a vehicle that’s equipped with a Dodge Cummins that is from the fourth or fifth generation.
Do you want to feel confident while driving? These Dodge Cummins models should be avoided. You will have more trouble with them than they’re worth. When it comes to the Dodge Cummins, it’s always better to wait for a quality option, even if it seems easier to buy one of the worse-off models.
Common Dodge Cummins Problems
It’s been discussed what makes Dodge Cummins engines so bad and how to avoid them, but what are the most common issues with them? How much time and money will you spend on the most common problems?
These are some of the common problems that plagued the Dodge Cummins during its worst years:
There is no easy way to handle these, and they can be very costly to fix. Chances are high that they will occur again in the future if they happen once.
Why are these problems so common? What can be done to prevent them? If you want a Ram with a Dodge Cummins engine, you should put your money towards that. Rather than picking one of the years to avoid, pick one of our recommended safe years. You will benefit from it in the long run.
Dodge Cummins Reliability by Years [Complete Chart]
In some Dodge Cummins model years, reliability is excellent, while in others, it is not. We have therefore made Dodge Cummins reliability ratings each year based on the ratings provided by reputable sources.
Model Year | J.D Power Reliability Ratings (Out of 100) | Edmunds Reliability Ratings (Out of 5.00) | Kelly Blue Book (Out of 5) |
2024 | — | 7.9 (Out of 10) | 4.5 |
2023 | 83 | 7.9 (Out of 10) | 4.2 |
2022 | 79 | 7.9 (Out of 10) | 4.2 |
2021 | 82 | 7.9 (Out of 10) | 3.3 |
2020 | 79 | 7.8 (Out of 10) | 4.3 |
2019 | 80 | 8.0 (Out of 10) | 4.6 |
2018 | 79 | 7.8 (Out of 10) | 4.4 |
2017 | 77 | 4.5 | 4.4 |
2016 | 73 | 4.5 | 4.6 |
2015 | 75 | 4.4 | 4.5 |
2014 | 73 | 4.5 | 4.4 |
2013 | — | 4.1 | 4.4 |
2012 | 72 | 4.2 | 4.3 |
2011 | 70 | 4.0 | 4.0 |
2010 | 78 | 4.0 | 4.7 |
2009 | 74 | — | 4.5 |
2008 | 72 | 3.9 | 4.5 |
2007 | 81 | 4.0 | 4.5 |
2006 | 76 | 4.6 | 4.5 |
2005 | — | — | 4.3 |
2004 | — | — | 4.5 |
2003 | — | — | 4.5 |
2002 | — | — | 4.2 |
2001 | — | — | 4.4 |
2000 | — | — | 4.4 |
Dodge Cummins Problems Count by Year
There were some major complaints about Dodge Cummins engines for some specific model years. Several Ram 2500 model years have been placed on the avoid list because of Cummins’s major problems. As a result, we have only listed problems reported in Ram 2500 models equipped with Cummins engines.
The following is a list of Dodge Cummins problems counted by year:
Dodge Cummins Years | Number of Problems (CarComplaints.com) | Number of Complaints (NHTSA) |
2018 Dodge Cummins | 6 | 23 |
2017 Dodge Cummins | 3 | 28 |
2016 Dodge Cummins | 6 | 47 |
2015 Dodge Cummins | 6 | 251 |
2014 Dodge Cummins | 7 | 59 |
2013 Dodge Cummins | 10 | 41 |
2012 Dodge Cummins | 5 | 139 |
2011 Dodge Cummins | 4 | 27 |
2010 Dodge Cummins | 5 | 1 |
2009 Dodge Cummins | 7 | 12 |
2008 Dodge Cummins | 7 | 44 |
2007 Dodge Cummins | 17 | 36 |
2006 Dodge Cummins | 15 | 16 |
2005 Dodge Cummins | 5 | 19 |
2004 Dodge Cummins | 8 | 36 |
2003 Dodge Cummins | 10 | 20 |
2001 Dodge Cummins | 6 | 24 |
2000 Dodge Cummins | 2 | 12 |
The problem numbers mentioned here are specific to Cummins engines. Several Cummins model years have received complaints, so we have put them on the avoid list.
Dodge Cummins Recall History by Year
There are a lot of Dodge Ram 2500 trucks powered by Dodge Cummins engines. The Cummins engine has a reputation for durability, but it also has some serious problems. Several Dodge Cummins-equipped Ram 2500 trucks were recalled due to the problems. The recall numbers and reasons for those Cummins-powered Ram 2500 years are listed below.
The following is the NHTSA recall history for Dodge Cummins by year:
Dodge Cummins Model Years | Recall Numbers | Affected Part |
2022 | 1 | The engine and the cooling system of the engine |
2020 | 2 | Powertrain issues |
2018 | 1 | Powertrain issues |
2017 | 3 | Engine and engine cooling system, Power Train |
2016 | 3 | Engine and engine cooling system, Power Train |
2015 | 6 | Engine, Power Train |
2014 | 2 | Engine and engine cooling system |
2013 | 4 | Engine and engine cooling system, Power Train |
2012 | 2 | Power Train |
2011 | 2 | Engine and engine cooling system |
2009 | 1 | Power Train |
2008 | 1 | Engine and engine cooling system |
2007 | 2 | Engine and engine cooling system, fuel system, gasoline |
2005 | 1 | Power Train |
2004 | 2 | Power Train |
2003 | 1 | Power Train (Red Alert by NHTSA) |
2002 | 1 | Engine and engine cooling system |
Note: Recalls for Dodge Cummins were only included in the above table.
Are Dodge Cummins Reliable?
Choosing the right years mentioned in this article will ensure you’re getting a reliable diesel engine from Dodge Cummins. When properly cared for and maintained, a Dodge Cummins can last up to 600,000 miles. The Dodge Cummins diesel engine is not only durable, but also fuel efficient and produces incredible horsepower.
420 horsepower and 1,075 lb-ft of torque are provided by the Cummins 6.7L Turbo Diesel engine. In the city, the Cummins engine achieves 20 mpg and on the highway, it achieves 24 mpg.
Fuel economy like this is truly remarkable among heavy-duty pickup trucks. There have also been high ratings of reliability for Dodge Cummins in its best years. The Dodge Cummins engine is generally reliable when it comes to heavy duty work.
5.9 Cummins Specs
Cummins 5.9L engines were used in earlier Dodge Cummins models. A 5.9L turbocharged diesel engine is available in Dodge Cummins models from 2006 and earlier.
5.9L engines have the following specifications:
5.9 Cummins Years to Avoid
5.9L Cummins’ worst years are:
Best 5.9 Cummins Years
The best years for 5.9L Cummins engines are:
5.9 Cummins Common Problems
As an older model, the Cummins 5.9L engine does not have as advanced technology as the newest models. The Cummins 5.9L engine has some serious issues, which need to be addressed.
The following are 9 common problems with 5.9L Cummins engines:
6.7 Cummins Specs
One of the most legendary Cummins engines is the 6.7L. With the new 6.7L Cummins, Ram 2500 and 3500 models are more powerful and torquey. Which is better, the 5.9 Cummins or the 6.7 Cummins? There is no doubt that the 6.7L Cummins is superior due to its incredible power and torque.
According to Cummins, the latest 6.7L Cummins is capable of 420 horsepower and 1,075 pounds-feet of torque. Ram 3500 equipped with Aisin transmission can produce this high torque output. Meanwhile, Ram 3500 and 2500 are available with 68RFE automatic transmissions that produce up to 370 horsepower.
The full Dodge Cummins engine specification is as follows:
Content | Standard Output | Max Output |
Displacement | 6.7L | 6.7L |
Torque | 850 lb-ft | 1075 lb-ft |
Horsepower | 370 hp | 420 hp |
Number of Cylinders | 6 | 6 |
Engine Wet Weight | 1071 lbs | 1070 lbs |
Compression Ratio | 19:1 | 16.2:1 |
Bore | 107 mm (4.21 inch) | 107 mm (4.21 inch) |
Stroke | 124 mm (4.88 inch) | 124 mm (4.88 inch) |
Fuel System | Bosch HPCR | Bosch HPCR |
Aspiration | Turbocharged and charge-cooled | Turbocharged and Charge Air Cooled |
6.7 Cummins Years to Avoid
Even though 6.7-liter Cummins is relatively new, it does not come without problems. There were many complaints about the 6.7 Cummins in some model years. If you want a hassle-free driving experience, avoid those model years.
The worst years for the 6.7L Cummins are:
Over 2,000 complaints have been received by CarComplaints.com about the 2018 Ram 2500 equipped with the 6.7L Dodge Cummins engine. There were 266 engine-related complaints among the complaints. As a result, you should avoid these model years of Dodge Cummins.
6.7 Cummins Best Years
It is generally considered to be a more reliable and less problematic Dodge 6.7L engine.
6.7 Cummins’ best years are as follows:
The life expectancy of Cummins engines above 6.7 is approximately 250,000 to 400,000 miles. If you maintain your truck and engine properly, it will surely last more than 300,000 miles without a major problem. It is for this reason that the above model years are considered the best.
In order to prolong the life of your 6.7 Cummins engine, follow these maintenance instructions:
Common 6.7 Cummins Problems
There are 5 common problems with Cummins 6.7L engines. The following are listed:
1. Clogged DPF Issues
Cummins 6.7L engines are most commonly plagued by clogged DPFs. DEF is generally not used by Cummins engines. Thus, nitrogen oxide (NOx) emissions are reduced by running the engine slightly rich. The soot produced by diesel engines increases when they run rich.
As a result, the DPF becomes clogged. It is sometimes possible to fix the problem by flashing the DPF. It is however necessary to replace the DPF if the soot accumulates severely.
2. Turbocharger Failure
Dodge Cummins engines do not suffer from common turbocharger failures. However, since the issue is important, it should be mentioned. Whining sounds, slow spooling, poor performance, and smoke from the exhaust are common symptoms of turbocharger failure. The 6.7L Cummins engine may need to be rebuilt if the problem is severe.
3. Fuel Dilution Issues
Fuel dilution is a problem with some Cummins 6.7L engines. It is expected that fuel dilution will occur within a certain range. There are several problems caused by excessive oil diluting in the engine.
You can avoid the fuel diluting caused by the 6.7L Cummins engine by following these simple steps:
4. Heater Grid Bolt Issue
Similarly to glow plugs, heater grid bolts are diesel engine components. Air is heated and passes over the intake manifold, helping the engine start when it is cold. 6.7L Cummins engines equipped in 2007 to 2018 Ram 2500 and 3500 trucks commonly fail heater grid bolts.
There are usually no major symptoms associated with heater grid failure, but it reduces a vehicle’s performance overall. Check the heater grid on the intake manifold if you experience poor performance.
5. EGR Cooler Problems
Many Cummins 6.7L engines suffer from EGR problems. White smoke from the exhaust is a common sign of a failed EGR cooler. The most effective solution is to replace the EGR, which costs around $120.
FAQs
Is the 5.9 Cummins Reliable?
It is a powerful and reliable engine with a 5.9L Dodge Cummins engine. Longevity and durability are great features of the 5.9L engine. Fuel economy is excellent with this engine. There is excellent torque output from this engine. There are a number of reasons why the 5.9L engine is so reliable.
How Many Miles Can a Cummins Diesel Last?
It is possible for a Dodge Cummins engine to last between 350,000 and 400,000 miles if it is maintained and cared for properly. Your Cummins engine needs to be well taken care of if you are going to achieve this milestone.
As I mentioned above, Dodge Cummins engines need to be maintained regularly. You can get a better idea of how to maintain by checking the guidelines.
‘5.9 or 6.7 Cummins’ Which is Better?
Cummins 6.7L is superior to Cummins 5.9L in overall comparison. While both engines are competitive in some aspects, such as reliability, durability, and fuel economy, the 5.9L Cummins has some advantages.
Furthermore, the 6.7L engine boasts power and torque output, a responsive turbocharger, advanced technology, and a quieter engine.
The 6.7L Cummins is better for those who want advanced technology, higher horsepower, and torque, as well as responsive handling. The 5.9L Cummins is the best engine if you want a proven, reliable engine.
Which Cummins ISX Years to Avoid?
We recommend avoiding Cummins ISX model years 2004-2007 and 2010. EGR system failure and frequent turbocharger failure are severe problems with these model years. It is also recommended that you avoid the 2008 Cummins ISX.
Despite this, we believe the 2008 Cummins ISX has fewer problems than the 2004-2007 or 2010 models.
Conclusion
4th and 5th generation Dodge Cummins are the best model years to consider. Modern technologies help improve performance and capability while enhancing fuel economy, and their powertrains are much more refined than those of previous generations. Dodge Cummins trucks from 2004 and 2005 are also worth considering.