Error code 0603 pcm
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Joined: Oct 2009
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From: Sandy
Error code 0603 pcm
Ok so i have a late 99 PSD and i just recently replaced the IDM and the truck finally started. checked the codes now it is throwing this code. I do have a edge progammer on it. recently the truck has had a starting problem and the wait to start light would not come on (only once in a while it would come on after turning the key on and off a few times) and the truck would start finally. I did have a code that read 1470? i think, that the IDm signal not detected or failure, thats why i replaced the IDM.
What does this code mean? (P0603)
Does this have anything to do with the IDM? Or chip?
Think i could have a short somewhere in a wire?
Bigdaddy
What does this code mean? (P0603)
Does this have anything to do with the IDM? Or chip?
Think i could have a short somewhere in a wire?
Bigdaddy
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Joined: Feb 2009
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This shouldn't be an issue for what you are experiencing. The P0603 Internal Control Module Keep Alive memory (KAM) Error is fairly normal when using a programmer.
Post Fiend
Joined: Nov 2007
Posts: 9,549
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From: Payson, AZ
As far as having to turn the key on and off a couple of times before it will start it may be a bad contact in the PCM power relay, or the relay in general is bad. Could also be a faulty ignition switch.
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
To see if you have a bad PCM power relay swap it out with the blower motor relay to see if you get the WTS light every time you turn key to on.
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From: LL, BC
I have gotten this code when my battery has been discontected, have you discontected yours since the last time you cleared the codes?
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Joined: Oct 2009
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From: Sandy
So i replaced the pcm power relay and still nothing... so my next question is anyway i can check the ignition switch to see if it's bad? I've been checking all wires and nothing looks bad or any indication they are bad.
I did disconnect the batteries after reinstalling the pcm. so i think im good there now....
other thing when i plug my programmer in to get codes it wont connect unless that WTS light is on... Any ideas???
Thanks yall
Bigdaddy
I did disconnect the batteries after reinstalling the pcm. so i think im good there now....
other thing when i plug my programmer in to get codes it wont connect unless that WTS light is on... Any ideas???
Thanks yall
Bigdaddy
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