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That's pretty interesting. With Jpro connected, can you go into the engine ecu and command things like the EGR, VNT, ITV? Can you view live data? Just for the hell of it, disconnect the pressure sensors on the air tanks and see if the cluster starts working correctly.

What scan tool are you using? With DXII, you can go into engine customization and change the soot amount. Change it to something like 2.3 and it'll put the DPR graph to three bars, which is when it will attempt an automatic regen. Then you can look at temps and stuff during a driving regen...

I'm assuming you're referring to P244B, which sets when the DPR graph reaches ten bars. Is it at ten bars? Did you pull this code out of the dash? The reason this set is there's a burner issue, or its cries for a manual regen were ignored. BCU codes cannot be read from the dash. There's a...

I haven't personally learned the patterns of ATC failure yet. So far it seems sort of random. There's a TSB on this, too (your dealership should know this. The TSB says "Got a P0421? Replace ATC".)The TSB lists all the hardware and gaskets and stuff they recommend replacing, but it's not...

The cure for P0421 is to replace the ATC. Expect the upper temp sensor to fight you on the way out. This is a fairly common problem, IDK why your dealer is confused.

Inspect that big wire harness that comes out of the junction box up front. If that gets whacked it can cause myriad weird electrical problems.

It comes out from the inside. When I'm on a roll it takes me about 5 hours. Also, there's no published procedure. I doubt there is an aftermarket alternative. I don't know the price. There's a long metal bar that runs the width of the dash. That has to come out. Remove steering column...

The alternator can stay. It's just nuts and bolts, but some of them are kind of a bear to get to and can be pretty tight. The biggest risk is breaking studs or mangling nuts on the turbo or downpipe. Your first attempt may be frustrating.

I misread what you said. The oil cooler IS suspect. Your dealer days it's common, but that has not been my experience. The cooler itself is #3 in the picture, and the d-rings are #2. On the occasion that we've replaced an oil cooler, we just order the entire assembly.

The turbo has to come off. Don't separate the cooler element from the base. Just replace the few d-rings on the base. The flat side goes toward the base, curved toward the block.

The common rail has six flow dampers on it. They go between the rail and injector lines. One may have debris in it. Have them figure out which cylinder is misfiring, then disassemble the flow damper for that cylinder(s) and look for debris. If they don't have software that can see cylinder...

It's a function of the instrument panel. Do you want help actually fixing it?

Misfiring? Has the leak been fixed? It was running normally before the leak and the repair? I'm trying to understand the sequence of events. Debris in the fuel system can cause a misfire. I've seen a few cases of a spring inside the pump break and the pieces go into the common rail. The flow...

Help me understand. Is there a coolant leak? Do you have to add coolant? Or does the heat not work? Or both?

Pin 25 on the TCM sends a signal to the instrument cluster that gets converted to speed. This is likely a wiring problem, if I had to guess. Take a peek in the junction box behind the air filter. Look at the connector terminals for corrosion.

Where exactly is the pump leaking?

Yes, I understand your frustration. When we sell a new truck, we keep a close eye on it and the warranty. We try to cover as much under warranty as possible.

You can get the fitting with o-ring and spring retainer from Hino. Idk the o-ring's size.

It's a known issue. The head gaskets leak externally, the rocker boxes can leak, and the oil pan gasket can leak. The oil coolers on earlier trucks were notorious leakers, but some improvements were made in that regard. Some engines never leak at all, and some puke fluids from every orifice.

I learned this after starting a Tech Assist case for a truck with P2BAE.