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
- 1Check field resistance for opens, shorts, and grounds
- 2Check quad resistance for opens, shorts, and grounds
- 3Check AC output
- 4Check local and remote Start/Stop switches
- 5Check for shorted wiring on set and remote
- 6Check fuel supply
- 7Check coolant level
- 8Check for cracked or leaking hoses
- 9Check for loose hose clamps
- 10Check for coolant in oil
- 11Pressure test cooling system (cold)
- 12Pressure test cooling system (hot)
- 13Evaluate fault codes
- 14Check field resistance for opens/shorts/grounds
- 15Check quad resistance for opens/shorts/grounds
- 16Check start/stop switches (local & remote)
- 17Check shorted wiring on set & remote
ASK RUDY ABOUT THIS FAULT
Get a diagnosis walkthrough for 57 on your specific Onan unit — cited to the OEM manual, not a forum guess.
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