57

UnclassifiedCooling

What This Code Means

Loss of Speed Sense; Excessive Fuel Pump Prime Time; Coolant Loss

Possible Causes

  • Opens, shorts, or grounds in field resistance
  • Opens, shorts, or grounds in quad resistance
  • AC output issues
  • Faulty local or remote Start/Stop switches
  • Shorted wiring on set & remote
  • Fuel supply issues
  • Low coolant level
  • Cracked or leaking hoses
  • Loose hose clamps
  • Coolant in oil
  • Field resistance open, short, or ground
  • Quad resistance open, short, or ground
  • Fuel supply issue

Suggested Actions

  1. 1Check field resistance for opens, shorts, and grounds
  2. 2Check quad resistance for opens, shorts, and grounds
  3. 3Check AC output
  4. 4Check local and remote Start/Stop switches
  5. 5Check for shorted wiring on set and remote
  6. 6Check fuel supply
  7. 7Check coolant level
  8. 8Check for cracked or leaking hoses
  9. 9Check for loose hose clamps
  10. 10Check for coolant in oil
  11. 11Pressure test cooling system (cold)
  12. 12Pressure test cooling system (hot)
  13. 13Evaluate fault codes
  14. 14Check field resistance for opens/shorts/grounds
  15. 15Check quad resistance for opens/shorts/grounds
  16. 16Check start/stop switches (local & remote)
  17. 17Check shorted wiring on set & remote

Related Onan Fault Codes

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Get a diagnosis walkthrough for 57 on your specific Onan unit — cited to the OEM manual, not a forum guess.

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