enroberts

As a follow up, the ECM failed and needed to be replaced/programmed. I cut the lid off the original ECM and found that all three wiring harness plugs (J1, J2, and J3) were clearly burned where they are soldered onto the circuit board (FYI, I had to break the board in half to get it out of the housing so that's why the green part of the board is peeled...notice though, the darker green areas around the solder points. You can also smell that the smoke came out). There was also burning at the capacitor solder points and the voltage regulator. The dealer that did the programming for me said this is the 5th or 6th computer they've replaced at their shop in 2 years AND the dealer I bought the computer from had FIVE of them in stock...what's that tell you?

Nope. I'm at 39k miles.

For those interested, my ECM failed. Replaced it at the dealer today and had it reprogrammed. Back in business! Sounds like an expensive trip to the dealer for them to waste a bunch of time combing through module after module.

Sounds like an expensive trip to the dealer for them to waste a bunch of time combing through module after module.

Makes sense. If the cables/starter don't resolve it, that will be my next step at the dealer.

I just ordered a new starter, positive battery cable, and negative battery cable. Amazon will have it to me by Wednesday. I'll throw it all on and see what happens. If still no start, I'll put it on my trailer and tow it to the dealer for a scan and see if they have an issue connecting to the ECM too. As of now, I'm leaning towards a failed ECM.

Oh, sorry, those are definitely not factory lol. I actually removed them today.

Proper scan? You mean like BCM and ECM scan? My ECM isn't doing much of anything because nothing can connect to it.

No, factory gauges.

ECU looks fine, smells fine.

all grounds and 12v check out as expected. Maybe the ECU took a crap?

Thanks for all the quick replies! I was just able to get my code reader to finally connect and pull codes. The only code is U0100 which is Lost Communication With ECM/PCM "A"

Hey all. Hoping for some help! Started my truck this morning for the first time in about a week. When I pulled out of my driveway the DIC told me to service pretty much every system in the truck (trailer brakes...no trailer attached, Stabilitrak, power steering...drive with care, 4x4, etc) and the steering wheel became ridiculously heavy with speed and tach both at 0 while moving/running. I threw a brand new battery in it but still nothing. The video below is AFTER the new battery was installed. It's like the ECM isn't getting 12v or ground. The fuel gauge shows empty, which it's not, the trans isn't showing what gear it's in, and there's absolutely no cranking. All fuses are fine.