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Cummins-Onan QG i error code 57 (QG i DF)

FaultGeneratorVerified against the manufacturer's manual

Over Prime Or LPG Pressure Sensor Fault, The LPG Solenoid Valve Fault. Indicates that priming exceeded 3 minutes in fuel mode. Or the LPG pressure is too high or too low, Or the LPG solenoid valve is open. Three causes in one code. Over-prime: STOP/PRIME held more than 3 minutes (SPN 4083 FMI 8) - release the key. LP pressure sensor signal more than 4.8V or lower than 0.2V (SPN 1390 FMI 2): check LPG supply is between 9-13 inch water column (2.2-3.2Kpa), then sensor, then ECU. LP solenoid open / short / over-current (SPN 6181): check solenoid open or short to ground, wiring, solenoid current over 1.6-3A = replace solenoid. QG i DF dual-fuel family (QG 7000i DF = HGLCA, QG 4000i DF = HGLDA, QG 2800i DF = HGLEA) code table - distinct from the QG 2800i/2500i (HGLAA) table and from the HGJAA (0983-0501) and KY tables. The status indicator flashes a 1-digit code, or two sets of flashes (tens, pause, units) for a 2-digit code; flashing stops after 5 minutes and pressing STOP/PRIME 3 times within 5 seconds resumes it. The last fault logged keeps flashing after the condition is corrected.

What to check, and in what order, is in the app. A step-by-step flow walks this code with the pass/fail measurements, wiring schematics and procedures that go with it, and it works offline in the bay.

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