When Do You Need New Fuel Injectors for Your Cat C15 ACERT Diesel Engine? 

Has the performance of your CAT C15 ACERT taken a dive? Are you going through a lot more fuel than you used to? 

There are a few problems that could cause those symptoms, but one notable thing that you should check out are your fuel injectors. If you're experiencing poor fuel economy and engine performance, then it might be time for a new set of fuel injectors.

How do you know if it's your fuel injectors that are causing the problem? We've put together a list of the key indicators that it's time to replace the fuel injectors on your CAT C15 ACERT diesel engine.

Want a closer look? Check out our video:



If you need new fuel injectors for your CAT C15 ACERT, call our ASE Certified Technicians! They can help get you the right fit for your engine.

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Not running an ACERT? Check out our post on injector problems for the CAT C15.


What Symptoms are Related to Poor Fuel Injector Performance?


cat c15 acert fuel injector symptoms | Highway & Heavy Parts


If you think it's a problem with your fuel injectors that's leading to the problems in your CAT C15 ACERT, then there are a few things you can look for to help you be sure. You can keep an eye out for the following issues:

  • Poor Engine Performance (misfire, rough running, knocking)
  • Failure Code/Check Engine Light
  • Hard Start/Poor Idle
  • Black Smoke
  • Abnormal Odor from Tailpipes
  • Decrease in Fuel Efficiency

These symptoms all indicate that it might be time for a new set of injectors. But if you're still not sure, there are some things you can do to confirm the issue.

Want to know more about injectors? Read our article on how fuel injectors work.


Confirming a CAT C15 ACERT Fuel Injector Failure

There are a few things that can go wrong and cause a fuel injector failure. For example, the injectors can fail electronically. This would be caused by a bad solenoid. 

You might also have a mechanical failure. If this is the case, oftentimes it's due to debris, water, air, or other contamination of the fuel injector.

It's also possible to have expanded clearances. This might be caused by extended service intervals of the injector.

If you notice any of the symptoms we listed, check these areas first. It can help you diagnose your failure more quickly. If your tests confirm a failure, you're in need of a new set of fuel injectors.


What About the Trim Codes for My CAT C15 ACERT?

So, what is a trim code?

Trim codes, also known as trim files, are codes that are input to determine how long an injector injects fuel. This helps to keep injection consistent, despite differences in machine tolerances, friction, and magnetic forces between some injectors. This helps to keep your engine running at its best. 

Looking for more info on this? Take a look at our article explaining trim codes.


cat c15 acert trim codes | Highway & Heavy Parts


When purchasing a set of C15 ACERT fuel injectors for your diesel engine, it'll also come with a disc to download new trim codes that go into the ECM. They do not use a trim code similar to the CAT 3406E or C15 injectors. The new code supplied must be used for proper function.


If you're in the market for replacement fuel injectors for your C15 ACERT, Highway & Heavy Parts has a great selection for you. Be sure to have your engine serial number on hand for even faster ordering. 


Want to find the best injector for your diesel engine? Call our ASE Certified Techs at 844-304-7688, or request a quote online!