Hello everyone, need a little help. Was wondering if anyone has used a used ECM in their truck if the original failed,i can purchase a ECM from a 99 3500 5spd 4x4(mine is a 99 2500 auto 4x4),but what i can gather from TSB 18-033-04 the ECM part# is the same for 981/2-99. I have CODE P1694 and my truck has a 10-15 sec delay till the Wait To Start light comes on and then i hear the lift pump prime.I imagine that i would have to have the ECM reflashed which i can get done. i can get it for a great price.

I wish you would have posted up this morning. I just swapped the ecm from my 98 auto to another guy with a 98 5 speed. I havent had mine flash and it runs, might just try to run it. I have ran a two ecms from 98's and one from a 2000 without flashing them. My stock ecm idled great and cranked soon as I hit the key but these other two 5 speed ecm's idle a little rough and take longer to start. Maybe I need a flash but not sure.

From what I've heard there is like 40 different softwares out there with different emission controls, Cal, Fed, etc. Would be best to flash it.