Onan generator · 1 model line
Onan generator code 23: Low Oil Pressure Cutoff Switch
Onan documentation lists 23 as “Low Oil Pressure Cutoff Switch”.
What code 23 means by model
| Model line | What the manufacturer says | Source |
|---|---|---|
| HGJAA / HGJAB / HGJAC Spec A-E | The Cummins Onan HGJAA/HGJAB/HGJAC operator manual lists Code 23 as Low Oil Pressure Cutoff Switch. | Cummins Onan RV Generator Manuals Cummins Onan RV Generator Set HGJAA/HGJAB/HGJAC Spec A-E Operator Manual 983-0101 |
What you can safely check
- Stop the generator.
- Check engine oil level only after safe shutdown and according to the operator manual.
- Record whether the shutdown occurred during start, warmup, or under load.
Stop and call a technician for
- Oil-pressure switch, engine lubrication, wiring, controller, and internal generator diagnosis belongs to Cummins service or a qualified generator technician.
Generators can produce carbon monoxide, moving-part hazards, fuel hazards, and lethal voltage. Shut the generator down and do not open energized compartments unless qualified.
Write this down before you call
- generator model/spec letter
- hour meter
- fault blink count
- oil level and oil type noted after shutdown
Other codes on Cummins Onan QG gasoline generators (HGJAA, HGJAB, HGJBB)
Full table: Cummins Onan QG gasoline generators (HGJAA, HGJAB, HGJBB)
- 2 Low Oil Pressure
- 3 Service Check
- 4 Over Crank
- 12 Over Voltage
- 13 Under Voltage
- 14 Over Frequency
- 15 Under Frequency
- 19 Governor Actuator
- 22 Governor Actuator Overload
- 27 Voltage Sense
- 29 High Battery Voltage
- 31 Over Speed
- 32 Low Cranking Speed
- 35 Control Card Failure
- 36 Engine Stopped
- 37 Invalid Generator Set Configuration
- 38 Over Current (Field Overload)
- 41 Generator Rotor
- 42 Processor
- 43 Processor
- 45 Speed Sense
- 47 Ignition
- 48 Generator Field Sense
- 51 Processor
- 52 Fuel Injector
- 54 MAT Sender
- 56 MAP Sender
- 57 Over Prime
- 58 Exhaust Gas Temperature Shutdown
- 81 Exhaust Gas Temperature Sensor Open
- 82 Exhaust Gas Temperature Sensor Shorted