Onan

2

UnclassifiedCooling

What This Code Means

Excess white smoke at start-up (warm); Excess white smoke at start-up (cold); High engine temperature; Low oil pressure; Engine oil leak; Overcrank; Loss of Raw Water Flow; Excessive Smoke Under Load; High Engine Temperature; Low Oil Pressure; Loss of raw water flow

Possible Causes

  • •Low engine compression
  • •Faulty glowplug relay
  • •Faulty glowplugs
  • •Low coolant level
  • •Grounded or shorted sender lead
  • •Incorrect temperature sender resistance
  • •Incorrect coolant temperature
  • •Restricted raw water flow
  • •Damaged raw water impeller
  • •Heat exchanger blockage
  • •Faulty pressure cap
  • •Low oil level
  • •Broken or loose sender lead
  • •Open pressure sender
  • •Blocked air flow
  • •Incorrect oil level
  • •Loose hose
  • •Loose drain fittings
  • •Grounded sender lead
  • •Shorted sender lead

Suggested Actions

  1. 1Check engine compression
  2. 2Check glowplug relay
  3. 3Check glowplugs
  4. 4Check coolant level
  5. 5Check for grounded or shorted sender lead
  6. 6Check temperature sender resistance
  7. 7Check coolant temperature
  8. 8Check raw water flow
  9. 9Check raw water impeller
  10. 10Check for heat exchanger blockage
  11. 11Check pressure cap
  12. 12Check oil level
  13. 13Check for broken or loose sender lead
  14. 14Check for open pressure sender
  15. 15Clean contaminated area
  16. 16Check for loose hose or drain fittings
  17. 17Check for leaks while running with dye in oil
  18. 18Evaluate fault codes
  19. 19Check coolant temperature inlet/outlet of radiator
  20. 20Check for blocked air flow

Related Onan Fault Codes

42112200-0482300-0472400-0463800-02243
Browse all Onan fault codes

ASK RUDY ABOUT THIS FAULT

Get a diagnosis walkthrough for 2 on your specific Onan unit — cited to the OEM manual, not a forum guess.

TRY IT FREE