Code P0603 - Diesel Forum -
'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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post #1 of 6 (permalink) Old 03-12-2006, 06:52 PM Thread Starter
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Code P0603

I have a F-250 PSD, 7.3 and am on several occasions clearing this code.
Question: Is this a sign of something coming that will force me on the side of the road in the future or is it something I will have to see the dealer about?

Other than this, everything else is fine.

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post #2 of 6 (permalink) Old 03-12-2006, 07:49 PM
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Re: Code P0603

If you will tell me what year truck you have I will move this thread to the appropriate forum. This one is for testing signatures, links and such. It clears itself off every night at midnight.

Dave / Believer45

THANK YOU to all the heroes in our military and all the heroes at home who wait for their safe return. I am humbled by and grateful for your service and sacrifice.


'95 F250 ext cab long bed, PSD, 5 speed, 2 wheel drive, 3.55 gears, 286,000 miles, Edge Evolution CTS (LINK TO MY REVIEW), LUK clutch, homemade REAR BUMPER, open element AIR FILTER, 36" ARE contractor cap. With tools, full of fuel and me on board (300 lbs) steer 3620, drive 3860 total 7480.
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post #3 of 6 (permalink) Old 03-13-2006, 07:36 PM Thread Starter
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Re: Code P0603

Sorry for the mishap.
My F250 is a 2002, crew cab, 4WD.

Thanks again,
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post #4 of 6 (permalink) Old 03-13-2006, 10:40 PM
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Re: Code P0603

Contrary to popular belief Codes do not tell what is wrong with a vehicle. A code is just a Referance number for a test proceedure. You get the code look in the system and it will give you a test proceedure to perform in sequence and not skipping any steps or it's not valid.

Now some codes are commonly known to be related to a certain problem. But you are still guessing till you test.

And sorry I don't guess at codes. But this will get you back to the top to someone who will. [img]/ubbthreads/images/graemlins/biggrin.gif[/img]

Wayne B

2000 F-250 XLT PSD 4X4 ESOF Auto, SC, LB, Gauges, Mag-HyTech Trans Pan & Rear End Cover, <font color="red"> (((XM))) Inside</font>, ATV Racks w/ Two Kawasaki Prairie 400 4X4's sitting on them, 25' Rockwood TT. Ashburn, Va. Member # 103 Pictures
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post #5 of 6 (permalink) Old 03-13-2006, 10:58 PM
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Re: Code P0603

PO603= PCM Keep Alive Memory. You will normally get this code when disconecting batteries or removing and installing a chip or programer, because your temporarily disconnecting power to the PCM.
I wouldn,t worry about it.

2004 F-350 Lariat, Supercab 4X4 FX4, DRW
Dark Toreador Red/Silver, 6.0L, Torqueshift Auto, ESOF, 4.10 LS, Camper Package, Dual Alternators. Build Date 6-8-04, Eng 5-28-04, Lance 9.5 Ft Camper.

Past 2002 F-350 Lariat, Supercab 4X4, Toreador
Red, 7.3L, Auto, DRW, Fully Loaded.

Past 94.5 F-250 Lariat, Supercab 4X4, 5 spd 7.3L PSD.
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post #6 of 6 (permalink) Old 03-14-2006, 08:40 AM
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Re: Code P0603

How long does it take for this code to clear itself? I disconnected the batteries over a week ago, drove it for a week. It is at the dealer for some maintenance and the code is still showing up. They did say it was an old code. Does that mean it is just an old code that was stored, but is not active now?

2005 F-250 XLT 4X4 V-10
2006 Wildcat 31QBH Fifth Wheel
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