Cummins/Onan 6CTA8.3 troubleshooting: 8 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Cummins/Onan 6CTA8.3 — full specs, parts & maintenance.
All Cummins/Onan fault codes →
| Code | Meaning |
|---|---|
| 31 | Engine will not shut off |
| 38 | Excessive engine moisture |
| 86 | Excessive fuel consumption |
| 387 | Excessive vibration |
| 80 | Exhaust smoke excessive under load |
| 338 | Knock |
| 29 | Fuel or oil leaking from exhaust manifold |
| 35 | Low power |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.