how to know if the PCM is bad in a 2005 Dodge ram 5.7
Asked by Bowisconsin Apr 17, 2020 at 12:31 PM about the 2005 Dodge RAM 1500 SLT 4WD
Question type: Maintenance & Repair
so the battery gauge and the fuel gauge don't turn on when you turn the key the battery is full but if you un plug the pcm and leave the key on and plug it back in they come to life and the truck will start otherwise truck wont even turn over then after a little while they don't work again /DOES THAT MEAN THE PCM IS BAD ?
10 Answers
Bowisconsin answered 4 years ago
owe and also when the gauges are not working and you hook the computer to it says un able to connect that tells me the computer is not working but the you unplug it and plug the pcm back in with the key on it will read it and says no codes are found
so I found out that the truck only does it when it's cold in the morning let it warm up out side and she'll fire right up and have no problems
ok how do you do a live scan if it runs great when it starts up ?
If you run a blow dryer on the pcm for 1 minute shut the key off and turn it on fires right up
new computer will be here tomorrow or Friday ordered it last Friday from Flagship1programmed to go plug and play they call it I will let you know if it takes care of the problem I'm hoping so
your talking from the bump to the ground correct I also have a anti zap for electrical that you put on the battery when welding or doing wiring that should work
ok got you I believe I have one of those
Guru9YLVJN answered 3 years ago
GuruFVJHY, did installing the rebuilt PCM from Flagship1 solve your issues? Thanks.
yes a new PCM fixed the problem and another thing that told me that the PCM was messed up is that when it wouldn't start and the 2 gauges wouldn't work if you put a heat gun or a hair dryer on the computer for under a minute you would hear the relays all start working and the truck would start but yes the new computer from flagship1 was a plug and play the first one they sent me did not work something to do with their programming , sent it back got another one and it has worked ever since . also remember that mine only did it when it was under 40 degrees out hope this helps .. How ever there is another problem with it but I have not looked into it as of yet . the ABS does not work hit the breaks and she just slides not lights on in the dash and that makes since now why the cruse has never worked any suggestions on that would be great thanks have a good day and I hope this helps you out Computer was 249.00 I believe wasn't to bad
