This is off a booklet that someone gave me when I had some code questions. Hopefully these apply to your H2.
P0650 - Malfunction Indicator Lamp (MIL) Control Circuit
P0654 - Engine RPM Output Circuit Malfunction
If these codes do not correspond to what someone else might have please let me know so that I can toss this booklet.
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Jose T.
\'04 Pewter H2 Lux
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