(02-25-2016 )gearhead Wrote:  Have the codes read by someone then go from there. This will point you in the right direction trust me.

(02-25-2016 )Ted Fisher Wrote:  I know this is jumping to conclusions but the driver shut the truck off and got out he said there was a funny noise coming from the def tank. I'm worried about them taking it to the dealer because the def system is under warranty but the engine isn't. The service department is saying they will just have to see but I don't want them to just start throwing parts at it.

(02-26-2016 )Rawze Wrote:  

(02-25-2016 )gearhead Wrote:  Have the codes read by someone then go from there. This will point you in the right direction trust me.

I just helped someone with their truck that they had into the dealer many times over for repeating DPF and SCR issues. they spent more than 20,000 in repairs with no solid results.

Here is what we found... the truck owner claims it came straight form the dealer in chacago (name removed), and on its 1,000 mile journey, all the problems came right back again for the 4th time. Truck was purchased used (450k miles) a few months back and had nothing but problems. the guy could hardly make any money it was down so much.

This person had ALL the sensors changed, including the NOx sensors. They also did a thorough EGR tune-up, replacing every EGR related sensor on the motor and cleaning out every pipe. The dealer changed the EGR valve and turbocharger as well trying to solve this with no results.

There are a few guys over on other auto/truck forums that call me a "shade tree truck stop tuner", so let me tell everyone what my shade-tree redneck back-yard half-asse*d ways found (btw I don't do truck stop tuning).

ALL of the joints in the in the DPF, SCR, and other piping were missing all the gaskets. Dried and crystallized SCR fluid wahs seeping heavily out of several of them. All the joints between the components were leaking badly. there were also 2 joints so loose, you could wiggle the exhaust pipes back and fourth easily. - Can anyone say "Death in your sleep by carbon-monoxide poisoning?" It is a good thing this guy does not idle all night while he sleeps.

This alone would be bad enough for the system to not work properly, but there was another problem, and was likely the culprit since the purchase of the truck. Even with the system running, the NOx levels were being flagged all the time out the rear sensor. The truck was not using excess DEF fluid, and the sprayer, filter, pump, everything was in good shape. We even tested the spray pattern on the injector. There was no "Volcano" built up inside the doser pipe (common problem), and everything looked good. That is, until we discovered the DOC was an after-market can, not an original factory component. it was unable to reduce NOx properly, and had larger than normal holes in it. Looking at it, and its different shade of color,.. I highly doubt it even had the precious metals required for it to perform its functions.

Can anyone say "Chineese Fake?" - That is what I am suspecting.

Just thought I would share that with those who are having repeating problems, but even this driver redneck of a shade-tree mechanic knows that a truck dealer or certified shop should AT THE VERY LEAST! be putting gaskets in the exhaust joints on this stuff, and checking the components to see if their fake!.

What a shame.

(03-02-2016 )joed2323 Wrote:  Wow rawze, thats terrible to get that kind of service from a dealer, most if not all kenworth dealers, mechanics have to be certified, but regardless that's not saying much either. Best one ive seen is driving a truck back from a kw dealer and double checking their work, I found pretty much all the bolts around the belhousing to be super loose to the point the tranny was ready to fall off... Ive seen some terrible work from quite a few dealers...

Word to anyone having to bring your truck to any dealer, make damn sure you crawl under your truck and or inspect anywork they perforned...

I realize its it's very easy to get distracted working on a truck when you have a person or persons distracting the mechanic, or getting pulled off the job then coming back to it... Always double check and triple check your work or there work...

(03-01-2016 )joed2323 Wrote:  If you suspect this has happened, all you need to do is remove the yellow plug/harness from the bottom of def pump, when you do this fluid will run out of this harness plug location and you will know instantly that your def pump is junk!!!

(12-16-2016 )schISM Wrote:  

(03-01-2016 )joed2323 Wrote:  If you suspect this has happened, all you need to do is remove the yellow plug/harness from the bottom of def pump, when you do this fluid will run out of this harness plug location and you will know instantly that your def pump is junk!!!

My cel. came on yesterday and the engine derated in short order. Codes 3559, 2976 and 3572 along with the 3714 engine derate. Peterbilt said they could "maybe" get me in on Monday so I started troubleshooting and when I disconnected the harness from the def module def fluid came pouring out. Kinda glad I found the problem but $650 for a pump that should be under warranty but probably won't because I didn't have Pete do it is a bummer. This will be the last one I replace as well as anything else related to aftertreatment.

Cuya ' Wrote:  I see MM - 2 in his future.