Trouble Code P0603? - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 07-21-2011, 05:23 PM   #1 (permalink)
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Trouble Code P0603?

What do heck does Trouble Code P0603 (Internal Circuit Mod. KAM error) mean?

Thanks,

Griz
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Old 07-21-2011, 05:48 PM   #2 (permalink)
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Did you play with your tuner? Just means that the battery was disconected or you changed tunes on your Super Chip 1705.
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Old 07-21-2011, 05:57 PM   #3 (permalink)
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Did you play with your tuner? Just means that the battery was disconected or you changed tunes on your Super Chip 1705.
Yes...I did both. So that code is thrown whenever you disconnect your battery or use a tuner?

Griz
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Old 07-21-2011, 09:24 PM   #4 (permalink)
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Yes...I did both. So that code is thrown whenever you disconnect your battery or use a tuner?

Griz

Yep!
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Old 07-21-2011, 10:52 PM   #5 (permalink)
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Yes...I did both. So that code is thrown whenever you disconnect your battery or use a tuner?

Griz
When you change tunes you will here the truck do some clicking. This is a "reset" that needs to be done to the PCM. No different than restarting a computer after new software is loaded.

P0603 is just telling you the KAM (keep alive memory) was reset.

When you do that, just clear codes and you will not see it until the next tune change.
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Old 07-22-2011, 11:10 AM   #6 (permalink)
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When you change tunes you will here the truck do some clicking. This is a "reset" that needs to be done to the PCM. No different than restarting a computer after new software is loaded.

P0603 is just telling you the KAM (keep alive memory) was reset.

When you do that, just clear codes and you will not see it until the next tune change.
Got it...I can sleep better now!

Griz
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Old 02-06-2012, 06:11 PM   #7 (permalink)
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Wow, thanks! I have the P1316 code, pulled the driver side valve cover off to check harness. Reassembled and still have P1316, but then the P0603 showed up as well. Tomorrow is the passenger side. Have sure hoping I find the issue there.
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Old 06-17-2014, 07:12 AM   #8 (permalink)
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I had the same problem with my UVC Harness. Ford has the upgrade to put a small plastic piece under the plastic spring clip to give it more elasticity, it costs roughly $15. Both my harnesses were lose and I still have the rough idle plus the thrown code, even after erasing it. So make sure you check your connections are tight at the battery.
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