Code PO603 - Ford Powerstroke Diesel Forum
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Old 03-19-2008, 11:44 PM
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Code PO603

Hi Folks, I live in Australia and have a 97' F350 Powerstroke with a trannie problem. The truck has a ATS trannie and torque converter, Banks transcommand, smartlock and Exhaust Brake. I changed the oil in the trannie last week and ever since then it drives OK until things get warmed up and then the OD light flashes and the torque converter won't lock up. When I check the code with my EDGE programmer it comes up with PO603. The trannie also seems to be slipping a lot. Can someone point me in the right direction? Aussie Mal
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Old 03-19-2008, 11:52 PM
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603 is keep alive memory. It has nothin to do with how the truck runs.
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Old 03-20-2008, 12:44 AM
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Originally Posted by lilredpowerstroke View Post
603 is keep alive memory. It has nothin to do with how the truck runs.
Thanks lilredpowerstroke for your prompt reply, but why is it the only code to come up when the light flashes and torque converter fails to lock and trannie slips? Regards Aussie Mal.
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Old 03-20-2008, 12:49 AM
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Can i asked which converter u put on from ats and how many miles u got on the tranny....
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Old 03-20-2008, 01:07 AM
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Code PO 603

Hi Tylerwitt34, As far as I know its a ATS Billet torque converter and has done about 20,000 miles. Regards Aussie Mal
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Old 03-20-2008, 01:45 AM
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You will need a scan tool that can read tranny codes.
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