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

 

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.

 

^^^^What Clay said, I get the 603 code every time I pull the chip or unplug my PCM, its not a big deal.

 

alright thanks guys

 

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.

 

Yeah my Wts light isn't working again it only works when it wants to. Im going to check and probably get a new one a see if that works.

 

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.

 

I have gotten this code when my battery has been discontected, have you discontected yours since the last time you cleared the codes?

 

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