Generac GP18000EFI troubleshooting: 16 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Generac GP18000EFI — full specs, parts & maintenance.
| Code | Meaning | Remedy |
|---|---|---|
| 6-1 | MIL is brightly illuminated and flashing. | See Trouble-shooting. |
| 1-1 | CO Monitor | Move generator outside. Contact IASD. |
| 1-2 | Battery Voltage | Contact IASD. |
| 1-3 | Battery Voltage | Charge battery to correct level. |
| 5-2 | Engine Speed | Fill fuel tank. Contact IASD. |
| 000136 | Equipment and property damage | Disconnect electrical loads |
| 12 | Engine fault code present. | See Fault Code Example or contact IASD. |
| 3 | Engine fault code present. | See Fault Code Example or contact IASD. |
| 10 | Engine fault code present. | See Fault Code Example or contact IASD. |
| 11 | Engine fault code present. | See Fault Code Example or contact IASD. |
| Otro | Múltiple | Comuníquese con un IASD. |
| Symptom | Cause | Remedy |
|---|---|---|
| Engine will not start; or starts and runs rough. | 1. Dirty air filter. 2. Out of fuel. 3. Stale fuel. 4. Spark plug wire not connected to spark plug. 5. Bad spark plug. 6. Water in fuel. 7. Low oil level. 8. Excessive rich fuel mixture. 9. Excessive lean fuel mixture. 10. Intake valve stuck open or closed. 11. Engine lost compression. 12. Engine fault code present. | 1. Clean or replace air filter. 2. Fill fuel tank. 3. Drain fuel tank and fill with fresh fuel. 4. Connect wire to spark plug. 5. Replace spark plug. 6. Drain fuel tank; fill with fresh fuel. 7. Fill crankcase to correct level. 8. Contact IASD. 9. Contact IASD. 10.Contact IASD. 11. Contact IASD. 12.See Fault Code Example or contact IASD. |
| Engine shuts down during operation. | 1. Out of fuel. 2. Low oil level. 3. Engine fault code present. | 1. Fill fuel tank. 2. Fill crankcase to correct level. 3. See Fault Code Example or contact IASD. |
| Engine lacks power. | 1. Load is too high. 2. Dirty air filter. 3. Engine needs to be serviced. | 1. Reduce load (see Know Generator Limits). 2. Clean or replace air filter. 3. Contact IASD. |
| No battery charge DC output. | 1. Battery posts corroded. 2. Bad battery cable. 3. Defective battery. 4. Bad receptacle. | 1. Clean battery posts. 2. Replace cable. 3. Check battery condition. Replace if defective. 4. Contact IASD. |
| MIL codes are flashing. | 1. Multiple. | See Fault Code Example or contact IASD. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: 1. Dirty air filter. 2. Out of fuel. 3. Stale fuel. 4. Spark plug wire not connected to spark plug. 5. Bad spark plug. 6. Water in fuel. 7. Low oil level. 8. Excessive rich fuel mixture. 9. Excessive lean fuel mixture. 10. Intake valve stuck open or closed. 11. Engine lost compression. 12. Engine fault code present.. See the table for the matching fixes.
Documented causes: 1. Out of fuel. 2. Low oil level. 3. Engine fault code present.. See the table for the matching fixes.
Documented causes: 1. Load is too high. 2. Dirty air filter. 3. Engine needs to be serviced.. See the table for the matching fixes.