Cummins/Onan 5.0 EGPAD troubleshooting: 18 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Cummins/Onan 5.0 EGPAD — full specs, parts & maintenance.
All Cummins/Onan fault codes →
| Symptom | Cause | Remedy |
|---|---|---|
| Engine misfires | Worn or fouled spark plug | Clean or replace spark plug |
| Lean fuel mixture | Incorrectly adjusted carburetor | See Carburetor Adjustment section |
| Contaminated fuel | Drain fuel tank and refill with fresh fuel | |
| Dirty air cleaner | Clean or replace air cleaner | |
| Backfires | Worn or fouled spark plug | Clean or replace spark plug |
| Excessive engine wear | E140H engine: See Onan Elite Horizontal engine manual 965-0758 GH170, GH280 engines: See Engine Block Assembly section | |
| Restricted fuel flow | Plugged fuel filter | Clean or replace fuel filter |
| Incorrect fuel mixture | Incorrectly adjusted carburetor | See Carburetor Adjustment section |
| Exhaust system blocked or restricted | Locate and remove cause of blockage | |
| Incorrect valve clearance or defective valve(s) | E140H engine: See Onan Elite Horizontal engine manual 965-0758 GH170, GH280 engines: See Engine Block Assembly section | |
| No load speed set too low | Adjust governor setting | |
| Excessive engine wear or damage to engine | E140H engine: See Onan Elite Horizontal engine manual 965-0758 GH170, GH280 engines: See Engine Block Assembly section | |
| Restricted air flow | Dirt or debris blocking air inlet or outlet | Clear away any debris that may restrict airflow |
| Dirt or oil covering engine cooling fins | Clean away all dirt and oil from engine cooling fins | |
| Cooling fan plugged or broken | Inspect cooling fan, see Generator Service section | |
| Clogged or faulty breather | Clean or replace breather | |
| Black exhaust smoke | Dirty air cleaner | Clean or replace air cleaner |
| White or blue exhaust smoke | Dirty air cleaner | Clean or replace air cleaner |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Worn or fouled spark plug. See the table for the matching fixes.
Documented causes: Incorrectly adjusted carburetor. See the table for the matching fixes.
Documented causes: Worn or fouled spark plug. See the table for the matching fixes.