Common Electrical Issues on a Kenworth T680 With a Paccar Engine

Here are some Common Electrical Issues on a Kenworth T6-80 With a Paccar Engine.
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[@hp4538]

How about when you get a Transmission fault issue?

[@matthewnewton8812]

What a cool, nice honest fella. I don’t own one of these trucks but I enjoy learning about them anyway. Thanks for the knowledge!

[@6061]

2016 t880 mx13 paccar Kenworth did a HORRIBLE job routing and protecting the wiring on these trucks. 300k miles, and there are wires all over the place that got zip tied too tight to sharp steel edges, they rub through the wire sleeves everywhere.

[@davidkattan1275]

Bro..... these problems you mentioned and the solution you offered, sounds like a solution for my truck, if so, I'd tip you. Wow. My mind is blowned.

[@LRMLeasing]

Glad we can help!

[@almalikmustafa7072]

Thanks for sharing this information and being honest. Other mechanic shops always make me feel like they’re lying and raising the price too high making it harder for drivers to stay in business and turn a profit. Thanks again!

[@LRMLeasing]

Glad to help! Let us know what else you would like to learn more about

[@rami5986]

I feel you

[@hopeone7820]

You borne for the job! Professional with knowledge

[@killshot6053]

Thanks for sharing that alot of paccar mechanics wont do what you did for sure

[@flashbar3616]

Thanks for the time you take to help others I got Transmisión service light problems on kw680 2018 auto

[@arthurjefferson2116]

Thank you for your knowledge

[@mjtheapprentice3166]

Very Informative, Thank you for sharing sir! drivesafe always.

[@jeffwatson2234]

Great info Wish you would of show close ups of each part

[@DLSWV]

Thanks for info. 👍😉

[@rebecaalvarezperez5062]

How do you call that pump that you said it will help with the priming? I’m wondering if there is a pump that we can use to empty the air out of the diesel lines once with put the new filter on

[@johncooper8839]

Thanks for the help

[@glencampbell8242]

Quick question I have a 2019 579 Peterbilt Paccar engine I noticed sometimes my Jake brake does not work so I have to shut the motor down and recycle it then it works do you have any idea what causes this

[@zokirjonsultonov2582]

Thanks a lot👍

[@ricardozazueta5453]

What are the most common issues with transmission faults in a 2022 T880 automatic ?

[@amgtransportation2242]

Hey I have a 2018 and I want to know is one of the electrical issues withe the park lights cause I checked all my fuses but can't figure out why they not working unless I have the headlights on

[@scottwankum6397]

Having ecm problems question do u need the injectors seirel numbers to switch a ecm out

[@davidniedorowski1292]

I have a 2020 kenworth t680. I have to keep regenerating it. It only last maybe an 1/8 of a mile? Just changed the EGR any advice?

[@briansimpson6830]

I have one with a Cummins that, while going down the road,all the power to the cab will be interpreted for a second, but not the engine,...any suggestions?

[@rod1798]

Thank you my paccar is saying service the air dyer but can't figure out why I already replace it still dating the same

[@gogobadr27]

I shorted out the power inverter wires. Any idea where the fuse is? Thanks

[@truthoverperception3562]

What are your thoughts about the 2023 T680’s? Are they worth is? How do you feel about the digital dash glitch?

[@chris76-01]

Any advice on how to fix code spn 3226 ? 2018 Peterbilt 579

[@renzobyd]

Definitely having the headlight issue

[@jeenblake3201]

I am having a issue with the fuse box underneath the bunk specifically with the refrigerator can you help

[@tommychoice6551]

I have a 2020 Kenworth with the windshield pump it’s no power to wires is there a fuse or anything that I need to look at because I replaced the pump nothings working try looking at all the fuses and can’t find anything to help me with the issue I have a feeling that it’s wiring issue but I just want to know if there’s a fuse or relay that I need to replace

[@tungasigobodhla354]

I'm running a T610 and the left indicator stopped working. Tested the light and is working . Now stuck . Any suggestions before I spend a lot more than I should please?

[@topracer0]

What we need to do when engine shut down will occur appers on the dashboard?

[@garythomas3735]

Hey I keep having a Fuel restriction on my T660 KW, I went to the KW dealer and they said I need a fuel filter housing they change it and I drive 100 miles and I still have the same problem I change the fuel filters several times and the problem still there ,any suggestions?

[@andrewvazquez6412]

I have a scr fault code throwing a short in doser valve. We rdplaced and went back to dealer and erased and cleared and 500 miles same code and went into limp mode. Loves said doser valve malfunction yet I don’t think anyone trouble shooter the actual problem. What can it be ? Also no one has davie software to rdmove stop engine derate code/limp mode. Is there another program? Will the otr clear a stop engine full derate?

[@GT20232]

What causes a truck to overheat?! Just ideling it goes over 210°. Never been like this before. Can you help out LRM?! My fan kicks on and cools it down, every 2 minutes it heats back up over 210° and the fan kicks on and cools it down again. Kenworth or Pape can't figure it out either. What can i do to fix this?!?!

[@patriciaquiroga3305]

my kenworth t680 turns off the cruise control with sudden movements and I have to turn the truck off and on to make it work again do you know what is happening? 

[@Khan-rc9cl]

I have a Kenworth t680 2018 with mx13 my truck do cranking but not start with ignition switch it start and it also shows me repair scr system can you help me what I need to do …. Thanks

[@user-rl7cw4dq9i]

Fuse E2 keeps blowing its circuit 2021 T680 ECU Any ideas why?

[@adriantabarez2534]

2016 t680 paccar gauge cluster suddenly bugs out all gauges move left to right and along with this all lights and transmission alerts come on together athe the same time then suddenly stops back to normal for a bit

[@hom3gr0wn30]

I have a 2020 t680 with an mx13, dash keeps blacking out it’ll say over voltage or high charge rate then blacks out and comes back on and voltage goes back to normal, 320 amp alternator and it’s been replaced twice, engine stays running, only thing that cuts out is the accessory circuit. Checked both sets of batteries.

[@aliceyajudge626]

Hello i have a 16 kentworth t680 and the light that keeps coming on is high power draw from battery! Help please?

[@user-my8qz8cw7u]

My 2019 kw , mx13 has oil pressure going very low 10 psi then up and down , asking the driver for emergency shutdown . Help .

[@mikemccune7763]

My t680 kennworth shows a +75 on the AMPS only when I start the truck. After driving it goes back to normal. This causes the truck to have delayed difficult start, but will start ever time

[@joevillarreal4722]

Where can I find the afterteatment fuse on a 2013 t660 with a Paccar

[@moorecobra8914]

I have the batt charge is showing 0% charge. Truck runs and starts no issues there,but it's not reading the battery life. What's the deal

[@christinamartinez1609]

My problem started today when I started wiping the dash board and button with a wet rag now none of the buttons work

[@Jackknife-TV]

The biggest problem I have with the paccar engine is lack of dealer training etc ..... Every time I've ever had a problem with a check engine light / engine shut down I've had to continuously take the truck to the dealer due to the simple fact that outside repair shops don't have access to Davie or similar software. 9 times out of 10 this meant multiple return visits back to the dealer most of the time my driver or I would make it about 5 mi down the road before the engine shut down lite would return ... Multiple problems with wiring harnesses for the emissions that I was stuck paying for until someone informed me that there was a service bulletin or recall after I spent thousands of chasing ghost repairs. Then there was the EGR valve repair which normally I could have done myself except for the simple fact the quick connects for the coolant lines on the EGR never worked properly and dealership informed me that there's a retrofit kit and I'd be looking at about $4,000+ for a simple EGR valve ..... I bought used EGR valve and a brass compression fitting fix that... Then there was a problem with horsepower multiple times I was told that the engines had a 500 horsepower rating let's just cut that in half and that's about the performance I received out of the mx-13 engine.

[@andrewvazquez6412]

Is there a recall on what year for the harness? How do I look into that?

[@junkboss5332]

I was replacing my temp gauge on my 2008 Kenworth T300 now have have no power to my temp gauge or my voltage gauge, Seems that there is NOT a fuse to these , so I am lost on why they are not getting any power to these two gauages

[@r0adwarri0r90]

Thanks. I’m running a 17 t680 with mx13. Nobody can prime fuel system after pm without throwing check engine light. Also, any owner op with an mx13 needs an OTR Reset tool. That thing has gotten me out of more than a few bad situations with the aftertreatment system

[@andrewvazquez6412]

Will it clear a stop engine full derate?

[@r0adwarri0r90]

@@andrewvazquez6412 Yes sir. Will also clear any code. Not just emissions

[@rayitodesol4114]

What would cause low fuel sensors to not warn me?

[@user-hp8tl4vr5p]

Windshield wiper spray motor works and fuse is good but still won't spray and suggestions

[@juliomedrano6286]

I have an electric issue dealer want to replace fuel pumps fuel rail filters Egr valve and Knox sencers because codes are active .. after all that still trick said shut off engine .. and now they found o ring that was cracked replace it and still truck lost power and having sane issues.. Need help and yes my lights on my hood stay on after I turn off truck

[@str8truckin69]

Check engine light along with wrench?

[@vkbj2015]

Thank you Steve! Top Video. I got yesterday the problem with my DEF „SCR System Fault". No Regen is possible. Now it’s show I have to stop Engine immediately.

[@LRMLeasing]

Sorry for delayed response, would need the entire code to have a better understanding of what is causing this issue. What kind of truck and engine?

[@andrewvazquez6412]

2019 mx13 p1514 t680 paccar

[@devona.9166]

Battery light comes on when I stop the truck and make hard left cube turns

[@aorach5315]

Hi Mike, is there a way to service and take care of PCC on paccar engine on my own

[@LRMLeasing]

Hey AO, unfortunately this is something that has to be handled by dealership level software. We deal with this all the time, will keep you posted if we figure anything else out!

[@arthurjefferson2116]

Hey thank you for knowledge! I am currently having my t680 at the dealer trying to find an electrical issue which they can’t seem to find. Trucks has been there for a week but went in for transmission not responding. I have had the XY shifter replaced 2 weeks ago. They told me I had a FMI 4 code which is a low voltage or short to ground and they a new wire harness would fix it. However after replaced it they said 2 new codes come up and that the ECA and TCM are not communicating. Any advice? They said ECA isn’t bad

[@mattb7127]

Hey Arthur, we would love to help. We would need the full code to best assist. Watch this video, this will show you how to get the complete code off the dash. Write them down and reply here. If you have any questions you can reach us on facebook also @lrmleasing kzbin.info/www/bejne/on-Wqa2Mqc1kgcU

[@JoeyPlus5]

@@mattb7127 Hi I’m having same issue. I changed the wiring harness late last October and transmission worked fine until today. I got codes 22 35 64 74 thru and ignition reset and code 3488 thru pedal reset. I’m really scratching my head on this one and most mechanics where I’m at don’t really work on auto transmissions

[@56wb56a]

@@JoeyPlus5 we had a similar problem on out t880 with allison automatic transmission not responding and we found a loose ground wire in the cab. The ground wire is kinda behind the brake pedal on the driver side floor. We tightened the ground nut and that multiple problems for us.

[@faridahmed7779]

I had a similar issue as well. There was a short wire somewhere and no mechanic could find it and also had the transmission fault. Dealer changer the PDC component, new chassis harness and installed a new transmission lever. So far so good for now.

[@nascar427]

Get rid of it. Make sure they are giving you a loaner for your downtime. We have many of these trucks, and the techs at kenworth can't find the problems. They have had to replace so many wire harnesses, some with luck, and some without. I had a 20 yr old truck and never had these problems.

[@isidroramos8349]

This is for a 2016 KW T680 w/ Paccar MX 13. Thanks for the info on the fuse by the fire wall I'll get the Tech to check this one out and let you know. I just got this truck, first trip out we haven't made it back. Issues started with high EGR valve back home, turned out the bracket that connects the upper valve and lower valve somehow fell off. We fabricated the part to specs and installed it. Before this it had not power. It felt like it was dragging. We replaced the little arm and ran it with trailer. No codes. Power was back to normal. Put it on its first run 1,500 miles later and de-rated. It was asking for a Regen but wouldn't take one by pressing forced switch. Road side came out and tried doing a forced Regen with computer but nothing. Towed it in to shop and they checked the EGR, and was told it checked out fine. QUESTION: Does anyone know if that bracket falls off whether the EGR will fall out of calibration and the only way to get it back to specs is to purchase one? I've heard once out of calibration it's no good, is this true? They replaced DEF Level and Quality sensor, but nothing. Cleared the codes but they kept comping back and wouldn't allow for forced regen. Two weeks into this mystery and Techs can't figure it out. QUESTION: Will this next step work? The next planned step was to wipe the computer and reinstall software to try and get codes off and regen. This will be done by a Tech from the KW dealership. Supposedly requires Paccar to release some passwords to do so. QUESTION: Does any one feel this might be the EGR valve after all? QUESTION: What about the crankcase filter and pressure sensor? QUESTION: Or how about the Particulate matter sensor? Is it possible the DPF needs to be completely cleaned? Thanks!

[@nascar427]

Get rid of it, nothing but problems. We have many of these trucks, and they are in the shop every day because of electrical issues.

[@zacharybelavois4610]

Hey steve what would you say about a Kenworth t680 cab marker lights not working. On my trailer everything works as should but my cab marker lights will not work. I changed the fuse and have checked the relays not sure what else to do without having it in the dealer for a week. Thanks I appreciate it.

[@LRMLeasing]

If you check the fuses and the relays are good than unfortunately you may have to go to a shop to get hooked up to the computer and to have the wire harness checked out. You may have corrosion or damage on that harness.

[@Bendigo1]

Did you turn on all the switches? :) i say that as a joke, but i don't know how many drivers i have seen go to the shop for the same issue just to find out they were not turning on the switch next to the headlight switch.

[@blk_killzoneops]

what about a eaton inverter giving out code e05

[@renesandovaljr.5797]

How to replace a front wheel speed sensor

[@joecreek5119]

2016 T680 Pacar/auto 580k miles makes noise when starting. Intermittent noises, varied sound, sometimes loud enough it sounds like something could break. Always starts ok. Starter/batteries checked out. Any idea what the problem could be?

[@LRMLeasing]

Hey Joe, that is a tough one without being there. Could you be more specific of the location of where the noise is coming from. I know it sounds simple but you just have to start tracing sound and work your way out from there.

[@joecreek5119]

@@LRMLeasing Thanks for the reply. Basically the noise comes from the engine compartment. But it's intermittent and I've not been able to get it to do it in the presence of a mechanic (probably 4 of them). I was hoping you had come across this same issue before and could point me in the right direction, but possibly it's not a common problem.

[@claytonrobinson1510]

I got a KW 2015 the cab light on top comes on my there self I unplugged all the switches inside the cab and still came on how do I fix it

[@LRMLeasing]

So, I would have the body controller checked out. Unfortunately, you would need to go to a shop and have the computer hooked up and test the body controller. Good luck!

[@user-qw5bm9tj5m]

Hey man, thanks for sharing this video. I have a 18 t680 with a paccar and I ve been having 2 warnings coming up for quite a while and then they leave but until they leave it’s burning me fuel doing regen on motion I guess. The major light that comes up all the time says SHOOT LEVEL HIGH then I keep driving and it throws a message that the engine is derate thru drivetrain but after a while it will go away on its own. I want to fix it because probably some day it will get worst. And am not going to dealership again for repairs cause they charge ridiculous amounts and they are not that great as they try to sell professionalism. Anyhow.. Can you work on my truck? Could you check it out?

[@johnaguilar8261]

I’m having isues with trailer stop light

[@ramonzarate9738]

Kw t680 number 802 fmi4 ? 2019 como solucio?

[@danielritsch4328]

I have an 87 Kenworth 8v92 with Electronic fuel injectors. I can't get it started . It won't hit even on ether . I've cleared all the fuel lines and cleaned all the injectors . It just cranks and cranks and cranks

[@ronaldevans7159]

I am having problem with no movement on the passsenger side mirror the heated mirror work but no movement ?

[@Bendigo1]

Check fuses, manually move the mirror a bit, sometimes they get stuck, especially in winter with all the stuff from the roads.

[@Ronnie0033]

Where can I find the front wire harness? Or the part # Thanks

[@LRMLeasing]

Hey Ronnie, we made a video answering some users questions including yours. It will be posted on the 26th, but simply put there should be a white tab on the harness connection points with a part#, if you cant locate it or its rubbed off, get with your local dealer and provide them with your vehicle information. They can pull the schematics and provide you with this information. Or send it here and we will do our best to provide you with the part number

[@STANKY_NUTZ]

I have a 2015 T680 and blue beacon washed under the hood and my left low beam went out so I brought a new bulb and still out I took the original bulb and put it in the right side and it came on so it's not the bulb do you think it's a fuse for just one side of the head light?

[@LRMLeasing]

Hey Brian, always check the fuse first. If it is not the blown, you may have to replace the whole headlight assembly as the wash person may have destroyed it with the water. We have seen it-before. Any time they you have someone as the truck they need to be careful when washing around any electrical components, headlights and especially the computers around the engine compartment. Direct contact at high pressure will certainly damage it. They should know better but mistakes do happen.

[@STANKY_NUTZ]

@@LRMLeasing where is that fuse for the left headlight? Do you know where the window washer fuse is located? I can't find either one

[@LRMLeasing]

@@STANKY_NUTZ The fuse for the head light would be located on the driver side under the hood on the front wall. There is no fuse for the washer fluid as it get its signals from the body controller

[@STANKY_NUTZ]

​@LRMLeasing I changed the harness I got both high beams on but still no low beam, I forgot to mention I smelled a a eletrical burning smell by my battery box and that's why I'm thinking they went out

[@charleshinson344]

I have a code of u1136 and can not find the fiz

[@leestewart3690]

The paccar mx13…. What does everyone thing about it?

[@jeffreymoore7729]

Anytime the ABS trailer light flickers the truck will not shut down the next time I stop

[@vipanbasra1446]

I see comon isses engine knocking sound. Even u adjust valves and transmission fault. Shifter problem. Egr gasket leak

[@muadalrohani966]

Coolant seems be always building pressure n leaking u can see it boiling up in there by the release end got keep steady so no leak now every time in shop shop take money no fix no repair issue 😅😅

[@abdielpizarro5771]

I have a problem in my T680 the code is fuel pressure!What could it be?

[@LRMLeasing]

did the fuel pressure code pop up right after an oil change? If so, they most likely they did not use a machine to pressurize the fueling system. After sometime the code should clear on its own. If it was not after an oil change feel free to provide the full fault code here and we be happy to get back to you

[@vkbj2015]

@@LRMLeasing guys you sound like real mechanics who know what they do and try REAL to help

[@misaonthefly]

I have a fuel data error

[@DirtySouthItalian713]

Have a video of what a 2022 Kenworth T680 doing something strange.

[@DirtySouthItalian713]

kzbin.infojnzxoz8zPZk?feature=share

[@LRMLeasing]

Hey Anthony, its a tough to tell by the video but its definitely a communications issue. We recommend looking at the body controller.

[@nascar427]

We have many of these trucks, and all are fairly new. Too many electrical problems to mention. Too much down time. And also have had to replace so many harnesses. This should not be acceptable. I had a 20 yr old truck, and never had any electrical issues like these trucks.

[@juanramirez-pi9ev]

Yeah how come you didn't show where are the problems

[@dedrickjohnson3300]

My pacr won’t start 😭😭😭

[@rashley55]

T680 keeps blowing external power supply for dtiver and passanger

[@flakoloko5009]

Best paccar m-13 with epa 17 master piece

[@darthandroid8444]

T680 tractor doesn't Charge trailer liftgate batteries no blown fuses and electrical cord has no issues

[@danielmandekic407]

Junk....it's not a manufacturer's defect if it's not safety related.

[@stacyhukill8903]

My 2008 Kenworth t300 want turn off with the key

[@jameswilliams1048]

Stacy Hukill, did you find out what the issue was with your truck? I pulled up to the consignee last night and my truck wouldn't turn off either. I finally got it off and then I started it again and it fired right up.

[@harpreetSingh-ym2pv]

Cooling sigh come on and off whirl driving ke worth t680

[@LRMLeasing]

so, I would need to see the symbol to be sure. but in a KW it could be for the exhaust system telling you that its hot or that the fan is on for cooling for the coolant system

[@hedayatullahazame8244]

The worst engine in the whole world is PACCARS

[@olgaortiz3889]

Talking too much and not show it,