My 1999 ram 2500 has a hard start, no start condition I have to unplug the pcm and ground wires to battery with the key on to get it to start and sometimes it goes to wto at start u. Any help would be appreciated 

Does the starter motor crank the engine but the engine does not start?  

Which wires from the PCM are you grounding?  Color and connector position at the PCM please.

It cranks but won't start. I'm unplugging the three buss bus connections from the pcm and then unplugging the grounds at the batteries on the passenger side. I do all of this with the key on and it will usually start 

Have checked for trouble codes?

I don't have any codes

13 hours ago, Ede said:

I'm unplugging the three buss bus connections from the pcm and then unplugging the grounds at the batteries on the passenger side

Does it stay running after you reconnect these items or at what point does it die.

It stays running and runs fine. And I don't usually have problems with it for a few days

sounds like grounding issues.

23 hours ago, Ede said:

 I don't usually have problems with it for a few days

So, it's an intermittent problem.  Next time it happens try starting it with just the right connector at the PCM disconnected.  If it still doesn't start disconnect the left connector. The PCM grounds at the passenger side battery.  The center connector is for the transmission sensor and solenoid control.   Be sure all the connections, battery terminals, and grounds are clean and tight.

 

 

 

 

 

I'll try that. I have also heard about ac noise causing ecm problems and I was wondering if that might be my problem. 

17 minutes ago, Ede said:

I have also heard about ac noise causing ecm problems and I was wondering if that might be my problem. 

That's a good point and it should be addressed and corrected as soon as you can because it can led to other problems but I don't think it is causing this no start situation. 

Are you thinking it might be in the pcm? I was also wondering if I can put a manual ecm in it I'm doing a manual swap 

I have a similar problem, I already changed the crankshaft sensor, apps, overflow valve and I still have the problem that when I start it it is purring for a few seconds and it goes off alone, I already did the thing to disconnect the left connector of the pcm and it started me fine but I haven't gotten to the problem

So after a bunch of research I have found it to be a bad ecm caused by ac noise 

 

7 minutes ago, Ede said:

So after a bunch of research I have found it to be a bad ecm caused by ac noise 

 

Well, I'll be... for sure thought it was in the PCM.  So you'll be doing the W-T mod and sending the ECM out for repair?   

I'm ordering a new ecm from flagship one in New York and I'll be doing the W-T mod

Flagship one has "new" ECM's?

If so what do they cost?

Edited February 13, 20205 yr by dripley

Great... Let us know how it works out and how customer serviced is from Flafship One.

Below is a list of ECM repair shops and how they rate here thanks to @pepsi71ocean  

 

 

I'll let everyone know how they are 

On 2/13/2020 at 6:45 PM, Ede said:

I'll let everyone know how they are 

 

Please do. So I'll add it to the list.