PCM error code PO603 "Help!"

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Jul 16, 2006 | 07:54 PM

case2273

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Joined: Jan 2004

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PCM error code PO603 "Help!"

97' f250 powerstroke, 125K miles. Just purchased and had to change the mechanical fuel pump. Bought an Edge Evolution and read the codes before I set her for the tow package when I came up w/ the following code and description:

PO603 PCM Processor
Keep alive memory
(KAM) Error

Anyone know what this is telling me??

Jul 17, 2006 | 06:40 AM

Cuda_jim

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Joined: Oct 2003

Posts: 5,903

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From: MICHIGAN

Nothing to worry about. Most chipped trucks bet this error code. Just means that the batteries may have been disconected or the PCM lost battery power for a while.