P0300

WarningGeneral

What This Code Means

Engine misfiring; Rough idle

Possible Causes

•Vacuum leak
•Faulty spark plug

Suggested Actions

1Replace spark plugs
2Inspect and repair vacuum lines

Related Rehlko Fault Codes

REVERSE POWER SHUTDOWN P1-10 OVERVOLTAGE FAULT OVERVOLTAGE OVERSPEED OVERFREQUENCY OVERCRANK SAFETY NOT IN AUTO W MAINPWROVERL SHUTDOWN SD MAINPWROVERL SHUTDOWN MAINPWROVERL SD MAINPWROVERL

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Get a diagnosis walkthrough for P0300 on your specific Rehlko unit — cited to the OEM manual, not a forum guess.