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Demon Dually
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5,140 Posts
P0603 is an internal KAM(keep alive memory) error.
P1661 is Output circuit check circuit error which is another PCM error code.

It is sounding like you either have a bad PCM or if you have a chip installed it could be causing an issue with you computer. The easy way to check that is to unplug the chip and see if the problem goes away. Another thing to do is to unplug the harness from the computer and check for oxidation on the pins and to clean thoroughly and apply die-electric grease and reconnect and test again.
 

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Discussion Starter #3
thanks speeddemon.
Would the fact that I left my lights on all day, and killed the batteries a couple days ago have any thing to do with it?
 
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