Cummins Generator Error Code 117: How to Fix It

Q: Can I run my generator with error code 117?

No. Running the generator with high coolant temperature can cause severe engine damage. Always shut down immediately and troubleshoot.

Q: What coolant should I use in my Cummins generator?

Use a 50/50 mixture of distilled water and ethylene-glycol based coolant that meets Cummins specifications (typically Fleetguard or equivalent). Check your owner's manual for the exact type.

Q: How often should I check the coolant level?

Check the coolant level monthly and before extended use. Also inspect hoses and connections for leaks regularly.

Q: What is the normal operating temperature for a Cummins generator?

Normal operating coolant temperature is typically between 180°F and 200°F. Exact ranges vary by model; consult your owner's manual.

Q: Error code 117 keeps coming back after I added coolant. What now?

Repeated overheating suggests a deeper issue such as a faulty thermostat, water pump, radiator blockage, or a blown head gasket. Perform the full diagnostic steps or seek professional help.

Abstract

Cummins generator error code 117 indicates that the engine coolant temperature is too high. This is a critical issue that can cause engine damage if not addressed immediately. Follow these steps to troubleshoot and resolve the problem.