Cummins Generator Error Code 315: How to Fix It

Q: What does Cummins error code 315 mean?

Error code 315 indicates a problem with the fuel injector on cylinder #5 of your Cummins generator engine. This could be an electrical fault, clogged injector, or mechanical failure.

Q: Can I run my generator with error code 315?

It is not recommended. A faulty injector can cause misfiring, reduced power, and potential engine damage. It's best to address the issue promptly.

Q: How do I test a Cummins injector?

Use a multimeter to check resistance across the injector’s two terminals. Typical resistance is 0.5–2 ohms. Out-of-range readings indicate a faulty injector.

Q: How much does it cost to replace a Cummins generator injector?

The injector part itself can cost $100–$300, plus labor if you hire a technician. DIY replacement may save labor costs.

Q: Is error code 315 the same as a misfire?

Yes, a faulty injector on cylinder #5 will often cause a misfire, as the cylinder may not be getting the correct fuel delivery.

Abstract

Error code 315 on your Cummins generator signals a problem with engine cylinder #5 injector. This issue can cause poor performance, misfiring, or failure to start. The injector may be clogged, faulty, or have an electrical connection problem.