Cummins Generator Error Code 312: How to Fix It

Q: Can I run my generator with error code 312?

It is not recommended. Running with a faulty injector can cause misfires, increased emissions, and potential engine damage. Address the issue promptly.

Q: What causes Cummins generator error code 312?

Common causes include a failed injector, wiring issues (open/short), or ECM problems. Fuel quality or contamination can also contribute.

Q: How much does it cost to fix error code 312?

DIY cost is typically $100-$300 for a new injector plus tools. Professional repair can range from $300 to $800 depending on labor and diagnostics.

Q: Do I need to replace all injectors at once?

No, but if multiple injectors fail, it's often due to a systemic issue like fuel contamination. Inspect and replace only as needed.

Q: Can a bad injector damage my generator?

Yes. A malfunctioning injector can lead to cylinder misfires, unburnt fuel in exhaust, and potential engine damage over time.

Abstract

Error code 312 on your Cummins generator means the engine control module (ECM) has detected a problem with the fuel injector on cylinder #2. This can cause rough running, poor performance, or failure to start. Follow the steps below to diagnose and fix the issue.