Onan generator · 9 model lines
Onan generator code 4: Over Crank
Onan documentation for 9 model lines lists 4 as “Over Crank”.
Check your model first. The same code can mean different things on different models. Find the model number on the appliance's data label, then use the matching row below.
What code 4 means by model
What you can safely check
- Stop repeated start attempts after the over-crank fault.
- Check fuel level and battery condition from normal owner-accessible indicators.
- Check normal vehicle fuel or LP level and make sure the usual owner fuel controls are available before one retry.
- Record whether priming was attempted before the fault.
- Stop cranking and let the starter rest.
- Check normal vehicle fuel or LP level before one cautious retry.
- Check fuel level and obvious exterior air-filter blockage only if safe.
Stop and call a technician for
- Internal generator electrical output, inverter, controller, sensors, fuel system, ignition, AC circuit, and engine diagnosis belongs to Cummins service or a qualified generator technician.
- Electrical output, inverter, controller, stator, rotor, fuel injection, sensors, wiring, coolant-system service, fuel leaks, and generator compartment repairs belong to Cummins service or a qualified generator technician.
Generators can produce carbon monoxide, hot surfaces, fuel hazards, moving-part 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
- loads running when the shutdown occurred
Full code tables for these models
- Cummins Onan QG gasoline generators (HGJAA, HGJAB, HGJBB) 32 codes
- Cummins Onan Quiet Diesel 5000-12500 generators 23 codes
- Cummins Onan QG 4000 / 3600 LP generators 19 codes
- Cummins Onan QG 2800i / 2500i LP inverter generators 29 codes
- Cummins Onan QG 7000i dual-fuel inverter generators 25 codes
- Cummins Onan QG 2800 KV generators 4 codes
Related troubleshooting guides
Official sources
OnanCummins Onan RV Generator ManualsOnanCummins Onan Generator Set for RV Operator Manual A031C171OnanCummins Onan Generator Set for RV Operator Manual A035D009OnanCummins Onan RV Generator Set HGJAA/HGJAB/HGJAC Spec A-E Operator Manual 983-0101OnanCummins Onan Quiet Diesel 10000/12500 HDKCA/HDKCB Operator Manual A043D713OnanCummins Onan Quiet Diesel 5000 HDKBA Operator Manual 0981-0166OnanCummins Onan Quiet Diesel 6000/7500/8000 HDKAH/HDKAJ/HDKAK Operator Manual A046L053OnanCummins Onan QG 4000/3600 LP KY Spec J-N Operator Manual 981-0159OnanCummins Onan QG 4000/3600 LP KY Spec P-R Operator Manual A041D131OnanCummins Onan QG 2800i/2500i LP HGLAA Spec A Operator Manual A062Y985OnanCummins Onan QG 2800i/2500i LP HGLAA Spec B Operator Manual A075S349OnanCummins Onan QG 7000i DF HGLCA Spec A Operator Manual A079E225OnanCummins Onan QG 4000/3600 LP KYD Spec A-C Operator Manual 981-0169OnanCummins Onan QG 2800/2800 EVAP KV Spec E-M Operator Manual 981-0153