OBD code P1633?????
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Junior User
Joined: Dec 2002
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OBD code P1633?????
Can anyone offer any insight on this code I am getting on my 02 5.4 SC F250. After searching I found a TSB about improperly installed fuses but that doesn't seem to be the issue here. I know the code is Keep Alive Memory Voltage Low. But the truck has 100k and now this show up. Could it be an alternator or battery thing? Thanks guys
Post Fiend
Joined: May 2006
Posts: 10,007
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From: Central Florida
A bad connection is my first thought. There is a big connector on the driverside firewall just below the brake booster. It takes a 10 mm socket to pull it, and a couple of 10mm and 8mm sockets to pull the pcm. I can't find my diagrams for 02 F250, but it couldn't hurt to hit both connectors with contact cleaner. While your at it, clean your battery terminals and look for the pcm ground wire and follow it the ground.
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