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I just ordered an SCR catalyst for a 2014 Kenworth because the EGR cooler on the Cummins engine leaked antifreeze into the exhaust and poisoned the catalyst. These problems are unfortunately widespread across manufacturers. Trucks nowadays have to be just about running perfectly all the time...

I'd take it back. This code means that there's little change in NOx conversion for the amount of DEF put in. SCR catalyst efficiency may be suffering. And they are going about it the wrong way. The flame temp sensor is used to control combustion in the burner, it has little to do with what...

This should be in the truck talk forum. You can get them out with a giant easy-out, but you will need special tooling to swage them into place with the head still on the truck. It's either got to go to the dealer, the head has to come off, or you need ultra-expensive tools. This is the same...

Other things can cause this too. Excessive engine oil is one, like from a turbo that is barfing oil. Either straight into the exhaust, or allowing the engine to consume it's own oil from a turbo pushing oil into the intake. Either way will have oil or excess soot entering the dpf, and the...

What model is the transmission? Can you take a few pictures of it? There may be a data plate on the side.

Don't mistake this for a diagnosis! I'm not there to confirm it. This is just conjecture based off of experience.

Take it out. If there's soot on the back, it's probably toast. Another way to check is to get some really thin tough wire, like .025 mig wire, and push it through the holes in the DPF from the REAR. It should move in freely , something like 9 inches. Check in a dozen or so spots all across...

DPF outlet overtemp. It got super hot. The DPF is probably melted. The injectors are going to be suspect, and they need to be replaced if they look questionable. When the outlet temp gets super high, I start worrying about SCR catalyst deterioration. I'd run a regen while looking at NOx...

Is the ABS light also on? If the trans overheats, it can push fluid out of the vent. If the ABS light is on, the torque converter unlocks and the transmission will get hot. Edit: You've had ABS trouble before. If your tone rings are shot, replace the rotors. Also check wheel bearing...

Could you post pics of the difference? I've only worked on one of those, and that was just to get air out of the injection pump.

The starter isn't fused.

Code 43 is a Wabco ABS code, for an open or short circuit on the right rear wheel. Do not drive the truck with the ABS light on. It messes with the transmission. Fix that immediately. The other problem is the auxiliary brake motor, right? Just making sure I understood correctly.

It helps slow leaks from a seeping seal, like you're describing. It works fairly well. Then again, the power steering on big trucks is one of the simplest hydraulic systems there is, and there's no exotic materials involved. You could pour 15w-40 in there and it would function just fine...

I'm gonna have to look that up.

It is not unusual for them to pass a little oil. A little oil looks like a hell of a lot when it's spread out all over everything. If your air filter is clogged, the problem should basically rectify itself. What's the oil consumption like? How much does it use in, i don't know, 5000 miles?

No problem. What's it doing that makes them think it needs replacement? This is very low mileage for an Allison. There is one thing in particular that you have to avoid, which is driving with the ABS light on. This causes the torque converter to unlock, and the trans overheats. When i...

Often when there's absolutely no communication with the VNT, the engine will just idle. If the VNT has failed in an awkward position, it might not even start, or it may roll coal at idle. I've run into the UD/Hino software dilemma myself. Trying to put in injector codes, no bueno. The...