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Replace Water-Damaged Powertrain Control Module (PCM)

8:01
21:40
684.4K views

At 8:01 in

JH Diesel Flipped His MegaTruck Into Cleetus' Pond...Now We See If It Runs! (6.0 Powerstroke)

What happens here

Despite restoring fuel pressure and confirming the starter works, the truck still won't start via the ignition. The team suspects a deeper electrical issue caused by the submersion, likely affecting the Powertrain Control Module (PCM). The mechanic removes the old PCM, which is visibly water-damaged, and replaces it with a working spare. He explains that diesel engines like this 6.0L Power Stroke require significant fuel pressure (around 60 PSI) to run optimally, although they can sometimes run poorly with as little as 20 PSI. The white smoke observed during previous crank attempts is attributed to raw fuel being dumped into the engine, not oil, indicating an issue with fuel combustion or timing, likely controlled by the PCM.

Goal: Resolve electrical and engine control issues by replacing the water-damaged PCM.

Tools and materials

  • Screwdriver — Removing and installing the PCM
  • Wrench — Removing and installing the PCM
  • Spare Powertrain Control Module — Replacing the water-damaged PCM

What they say

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he knows the deal oh man it's got a lot of codes i don't know where all these things are we're just going to clear them things out actually too bad how many were there probably 20 or 30. oh that that's it i've got at least 15 on there all the time that's pretty cool so i just pushed the tow haul button until hall light came on and stuff whenever your key goes on my abs light comes on which is good see what my high pressure oil is doing it was completely drained a lot of times when you drain the high pressure oil system it takes forever to fire back up you got to build the pressure up go ahead and hit that thing time all right go um let me check that charger on the second green light and it's still good yeah it still says jump start ready so i do have icp pressure which is good ecm is working which is good it may just be that the fuel system is so drained that it's could have water in the fuel too could have water in the injectors does the white smoke coming out means doing anything yeah that just means that it's um it is you know it could be dumping fuel in usually whites fuel white smoke like that with not starting as dumping raw fuel and it's usually not oil at startup sometimes it will but for the most part it's just dumping fuel right now cool you ready jasmine all right let the batteries charge up for a little bit and so we get to do is that his thing from the vacuum pump oh where does it pull a vacuum from like what does that thing do it's just an electric vacuum pump it's for the air conditioning and the um draw a blank here on a six liter mainly for the air condition defrost all that stuff sometimes these have a uh vacuum controlled four-wheel drive when they're auto hubs and so it controls that so diesels don't pull vacuum like a car does so you have to uh put an electric pump or a manual pump or something on there so interesting i didn't know vehicles this new still had vacuum operated hvac stuff yes yes they do so if it's getting fuel enough to make smoke out the exhaust is just not getting enough to run what will keep it from running at that point i'm not sure at the moment it could be still have air in the system and it's just about like water and air hell we could have a stuck injector if we got water in it oh battery's a little low so run out of charge for a bit and keep trying stuff i'm well not super diesel world yet as to why one wouldn't run if it's a gas engine i can use process of elimination but i don't know exactly what what they're…

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