How to prioritize diesel engine fault codes

How to prioritize diesel engine fault codes

Knowing how to respond can help you keep your heavy-duty diesel engines in the best shape possible.

When it comes to engines, the common knowledge is once they get to about three to four years old the maintenance can cause the total cost of ownership equation to slide. The constraints in the supply chain are making it difficult to just replace them. How can we keep them in the best shape possible?

The same way we maintain the performance of any truck, through ongoing and preventative maintenance intervals. This means pre-trip inspections, frequent checks, keeping shop software updated to ensure we are receiving accurate data, and promptly responding to fault codes should they arise.

Increased connectivity is a blessing and a curse. It’s great when it comes to staying on top of equipment service needs, but it’s so easy to get buried in them. Which ones should even be tackled first? Is there an order?

First step will be to prioritize the alerts we are getting. Red fault codes should come first, then yellow. Start with mission-critical fault codes; this means anything that has to do with your engine. 

Check engine lights shouldn’t be ignored by drivers – If so, the only destination your trucks will be heading toward is catastrophic maintenance issues. A prompt response time and accurate root cause analysis will be crucial for the health and performance of your trucks. 

Dealing with fault codes may come more regularly as the truck ages, but beyond the check engine light, you’ll want to stay on top of any engine fault codes that revolve around:

  • Coolant levels
  • Coolant temperature
  • Oil temperature 
  • Oil pressure 
  • Aftertreatment related faults

Which ones should you anticipate the most from an engine that is 4-5 years old? We’ll have the pros at Noregon field that question.

You May Also Like

Inside Accelera by Cummins, the Freightliner eM2 truck, International’s EV ecosystem and Peterbilt’s hydrogen fuel cell plan

All of that and more on the first episode of FE From the Floor: ACT Expo 2023.


Decarbonization in trucking is happening, but there's no magic bullet to lowering emissions. That's what makes ACT Expo so exciting--the truck equipment and technology of tomorrow is on display. Cleaner diesel, natural gas, hydrogen ICE, battery electric, hydrogen fuel cells--it's all here. We decided to bring it all to you in our FE From the Floor video series that talks to the biggest names in the industry and kicks the sustainability tires of trucking's latest environmentally-minded solutions that aim to bring real ROI to fleet operations. Watch the first episode of FE From the Floor: ACT Expo 2023 above and stay tuned tomorrow and Friday for more episodes.

From mileage to maintenance: Navigating the metrics of fleet service

Fuel efficiency, tire wear, and repair costs are important metrics to track for successful truck service operations.

Rolling in data? Tips to drive fleet service operations with actionable insights

With so much data to consider, it can be overwhelming to know where to start.

actionable data center
The importance of VMRS in heavy-duty operations

Since 1970, VMRS codes have changed the way service providers and fleet operators communicate with one another.

Setting heavy-duty truck service benchmarks

Through the correct utilization of your aggregated data, the repair process becomes more streamlined and efficient.


Other Posts

How to get the most from electric truck charging incentives right now

These programs can help lower the overall costs of charging stations to make the transition to EVs more feasible and equitable.

Optimizing your electrical system spring maintenance schedule 

The seven-way connection is the most prone area to the onset of corrosion.

The 7 EV battery lessons we learned at ACT Expo

Battery experts weigh in on long-life vs. high-density, the residual value of older EVs, ethically sourcing EV battery materials and more.