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P0500–P0599 fault codes
8 codes in this range have a plain-English write-up, checked by a person.
P0500P0500: the vehicle speed signal has a faultP0505P0505: the idle air control system has a faultP0506P0506: the engine is idling slower than the computer wantsP0507P0507: the idle speed is higher than it should beP0560P0560: the electrical system voltage isn't behaving as expectedP0561P0561: the electrical system voltage keeps jumping aroundP0562P0562: the electrical system voltage is lowP0563P0563: the electrical system voltage is high