You give a good explanation of the what and why. Exactly what I’m seeing on my connection with the dark looking dust. I’ve spoken with my local dealership and they act like this is a new issue. I’ve replaced my #4 pigtail 8 times now with dealer pigtails and now with pigtails from fleece performance. The dealership part definitely last longer as I usually get a month or 2 out of them while I have blown through the 4 fleece pigtails in a month. I’m now considering replacing the injector because my truck is unable to endure a 2-4 hour road trip now without having to replace the #4 pigtail.
Yes, if you are seeing repeat failures on the same injector, and you have replaced the connector… Most likely you will find worn terminals on the injector itself. Also, be sure you are identifying the correct cylinder. Cylinder 4 is the second one on the driver side, I have seen people replace the wrong one, because a diesel identifies the cylinders differently than the gas engines do. Thank you.
update- so I did replace my # 4 injector and sure enough the terminals had dips worn into them. I’ve been driving it for months and no longer an issue. Haven’t had to change out any pigtails since. The injector was easy to replace but a tip for anyone doing an injector swap. Make sure after the engine is cool to spray parts washer around the injector and blow out with compressed air multiple times. It’s hard to see how much sand small pebbles are sitting around the injector and you don’t want that falling into the cylinder when you pull the injector out and knock all the debris stuck around it loose.
When my son replaced that same connector on his Duramax, I inspected the backside of the foam cover and it looked like the cover had been making hard contact with the wire bundle and/or the connector itself for the #4 injector. I could see a shiny worn spot in the area of the wire bundle and connector. So, we're going to take a Dremel with a drum sander and remove some of the material under there where the cover's been making contact. That could very well be transmitting vibration into that wire bundle.
Great video! I've been getting PO26D for over a year now. It cleared during winter , but it came back when weather got over 85 deg here in Texas. How do I know if a connector is bad? I have a Autel scanner , but I'm not an actual mechanic and only have little use with it.. Will it show a bunch of misfires and should I look and see if the injector qty is too high?
The fuel injector connector will almost never cause P026D. It will cause misfires and injector circuit codes primarily. If one injector has high or low quantity compared to the others… First test engine compression, and if the compression is even then I would suspect a faulty fuel injector or more likely fuel contamination. Take a fuel sample and check for gasoline, exhaust fluid, water, etc. This can also happen if you use low sulfur off road diesel instead of ultra low sulfur. Thanks.
good afternoon i just A COUPLE QUESTION I TOOK MY TRUCK TO DEALERSHIP AND THEY SAID MY FUEL RAIL, TURBO CHARGER, FUEL SENSOR ALSO FUEL PIGTAIL NEED TO BE REPLACE BECAUSE I'M REDUCE SPEED. I CHANGE THEM TRUCK RAN FOR A WEEK AND NOW ITS SAYING CYLINDER 4 I CHANGE THE PIGTAIL ON THERE JUST LIKE YOU SHOW AND IT STILL IN REDUCE SPEED NOT UNDERSTANDING WHY PLEASE ANYTHING
Need to know what exact codes it has, but it sounds like it has a cylinder 4 fuel injector code which will cause it to enter reduced power mode. Are you sure you replaced the cylinder 4 injector harness? It is located on the driver side, second cylinder from the front. Also depending on how badly the connector was fretted, you may also need to replace the injector. This can also happen if you didn't clean the oxidation and dust out of the injector connector before reassembly. Thanks.
Normally I will use di-electric lubricant rather than di-electric grease....the difference is that one is designed for electrical terminals and connectors and the other is designed to insulate against high voltage. P/N: 12377900 Thanks.
Hi there I have a 2020 L5P and mine is showing Cyllinder 7 and 8 injectors are acting up. I am going to check the connectors Would it be a waist of time since its not cylinder 4? Great video btw
The connectors are definitely the most common failure. And it isn’t very likely that two cylinders on opposite sides of the engine failed at the same time unless there is some fuel contamination. It’s definitely worth inspecting the connectors. Thanks.
@@DadsGarageDiagnosticSpecialist Thank you I will check them out. my customer had the entire fuel system replaced due to his employee putting def in the fuel tank. It started acting up a year later so now I'm battling with it before we consider the injection pump etc
They were probably being cheap. Haven’t seen this problem on any of the recent models yet. GM does have dielectric lubricant available for service use, and there is a difference between the dielectric lubricant and the dielectric insulating grease. I remember on a lot of older vehicles most of the under hood connectors had dielectric from the factory…. Fords had the white tacky grease in them, but they weren’t the only ones doing it. I wouldn’t be surprised if it was a cost cutting measure. Thank you.
@DadsGarageDiagnosticSpecialist My 2020 just threw a code for number 4 injector. So they haven't done anything to fix this issue. Dealer wants 800 bucks. I'll be doing that myself lol.
Ours was a cylinder 5 connector failure took it off and cleaned it and put a bunch of dielectric grease in it cleared the codes and we were back on the road in about 2 hours. Going to trade the truck in there is no reason a 2020 should be breaking down like this! Never buy GM again.
Yes, cylinder five and cylinder four are the most common to experience this failure. I believe it has something to do with the harmonics of the engine and the vibrations being transferred up the wiring harness and it seems to affect these two cylinders the most.
@2hotscottpro the LML does not have common fuel injector problems aside from fuel system failures. Most likely you have a faulty Particulate Matter sensor.
@2hotscottpro soak in penetrating oil for a week or two multiple times before you try to remove the sensor… they tend to stick and tear the threads out.
Can someone explain to me why my 2019 l5p and my 06 lbz both have the same injector 4 issue? Had to replace the whole injector on my l5p now not sure about my lbz?
Great question. I use gloves a lot of the time for the convenience of being able to quickly take off dirty gloves so I can touch clean surfaces and it keeps my skin protected from all the harsh chemicals that I deal with all day. I wash my hands multiple times per hour all day long sometimes…occasionally my hands get dried out from washing too much so the gloves can help keep the hand washing down too. Thanks.
I have been seeing many 2019/20s 2500/3500HDs for "Cheap" these days. Cheap by today's Pricing Standards. They seem to be going for what a 2015/17s are going for. Lots of common complaints and problems. Now I know why. Problems like this. GM took a GREAT Engine and made it JUNK. You then think Gasser, NOPE. I had a buddy recently buy a 2014 5.3L Silverado, truck in excellent condition, well maintained, only 114K on it, records to prove it. He got just past his first 3K oil change, engine gave up the ghost. NEW Engine replacement, well over 10K. The AFM/DoD is JUNK. I have read the GM went all in to "fix" the problem in 2019. Instead of having several cylinders be able to deactivate, they now theoretically can all deactivate. This just MAGNIFIES the inherent problems with that technology. Don't think you can buy a Ford or Dodge though, they have their own problems, just as BAD or worse. The Consumer BUYS in at PREMIUM PRICING, new or used, and own vehicles that are NO longer Reliable, Ticking Time Bombs, with Constant/Regular Shop Downtime. This would ALL STOP if these Companies were Constantly HAMMERED with MASSIVE CLASS ACTION Lawsuits. Vehicle Manufactures no longer put out Quality, they put out JUNK that is designed to be brought back to the dealership in order to feed the beasts, the machine, DRIVE PROFIT by fleecing the consumer. My buddy that bought that 2014, it damn near financially broke him. He has two young kids, a mortgage, couple of pets, and saved to buy a "Good" used Truck for his family. That NEW Engine replacement cost him roughly half of what he paid for the truck. 114 000 miles.
Modern vehicles are designed to be throw away garbage. Blame government regulation…. The true cause of all of this. Also blame the consumer who time and time again finances and buys something they can’t afford. That is the American way.
"...poorly designed"?? The "deadly dowel pin" is a proud Cummins problem...and fatal to the engine!! At least the crappy wiring and connectors on the Duramax only cause misfires.
See the first video here: Another service regeneration. Duramax P2463 P2459 DPF clogged
th-cam.com/video/ZZVCz7n-epo/w-d-xo.html
You give a good explanation of the what and why. Exactly what I’m seeing on my connection with the dark looking dust. I’ve spoken with my local dealership and they act like this is a new issue. I’ve replaced my #4 pigtail 8 times now with dealer pigtails and now with pigtails from fleece performance. The dealership part definitely last longer as I usually get a month or 2 out of them while I have blown through the 4 fleece pigtails in a month. I’m now considering replacing the injector because my truck is unable to endure a 2-4 hour road trip now without having to replace the #4 pigtail.
Yes, if you are seeing repeat failures on the same injector, and you have replaced the connector… Most likely you will find worn terminals on the injector itself.
Also, be sure you are identifying the correct cylinder. Cylinder 4 is the second one on the driver side, I have seen people replace the wrong one, because a diesel identifies the cylinders differently than the gas engines do.
Thank you.
update- so I did replace my # 4 injector and sure enough the terminals had dips worn into them. I’ve been driving it for months and no longer an issue. Haven’t had to change out any pigtails since. The injector was easy to replace but a tip for anyone doing an injector swap. Make sure after the engine is cool to spray parts washer around the injector and blow out with compressed air multiple times. It’s hard to see how much sand small pebbles are sitting around the injector and you don’t want that falling into the cylinder when you pull the injector out and knock all the debris stuck around it loose.
That’s awesome! Glad to hear you fixed it.
Thanks for the update.
Outstanding video thanks for sharing. I just had all of my pigtails installed at 105,000 miles.
Thanks!
When my son replaced that same connector on his Duramax, I inspected the backside of the foam cover and it looked like the cover had been making hard contact with the wire bundle and/or the connector itself for the #4 injector. I could see a shiny worn spot in the area of the wire bundle and connector. So, we're going to take a Dremel with a drum sander and remove some of the material under there where the cover's been making contact. That could very well be transmitting vibration into that wire bundle.
That is very interesting. Thank you for sharing.
Do you need to clear the codes in order to get it off limp mode after replacing the connector?
Yes it will usually stay in reduced power mode until the codes are cleared.
Thanks.
Great video! I've been getting PO26D for over a year now. It cleared during winter , but it came back when weather got over 85 deg here in Texas. How do I know if a connector is bad? I have a Autel scanner , but I'm not an actual mechanic and only have little use with it.. Will it show a bunch of misfires and should I look and see if the injector qty is too high?
The fuel injector connector will almost never cause P026D. It will cause misfires and injector circuit codes primarily.
If one injector has high or low quantity compared to the others… First test engine compression, and if the compression is even then I would suspect a faulty fuel injector or more likely fuel contamination.
Take a fuel sample and check for gasoline, exhaust fluid, water, etc.
This can also happen if you use low sulfur off road diesel instead of ultra low sulfur.
Thanks.
Where its your shop located at?
good afternoon i just A COUPLE QUESTION I TOOK MY TRUCK TO DEALERSHIP AND THEY SAID MY FUEL RAIL, TURBO CHARGER, FUEL SENSOR ALSO FUEL PIGTAIL NEED TO BE REPLACE BECAUSE I'M REDUCE SPEED. I CHANGE THEM TRUCK RAN FOR A WEEK AND NOW ITS SAYING CYLINDER 4 I CHANGE THE PIGTAIL ON THERE JUST LIKE YOU SHOW AND IT STILL IN REDUCE SPEED NOT UNDERSTANDING WHY PLEASE ANYTHING
Need to know what exact codes it has, but it sounds like it has a cylinder 4 fuel injector code which will cause it to enter reduced power mode. Are you sure you replaced the cylinder 4 injector harness? It is located on the driver side, second cylinder from the front.
Also depending on how badly the connector was fretted, you may also need to replace the injector. This can also happen if you didn't clean the oxidation and dust out of the injector connector before reassembly.
Thanks.
Great video. No dielectric grease on the connection?
Normally I will use di-electric lubricant rather than di-electric grease....the difference is that one is designed for electrical terminals and connectors and the other is designed to insulate against high voltage. P/N: 12377900
Thanks.
Hi there I have a 2020 L5P and mine is showing Cyllinder 7 and 8 injectors are acting up. I am going to check the connectors Would it be a waist of time since its not cylinder 4? Great video btw
The connectors are definitely the most common failure. And it isn’t very likely that two cylinders on opposite sides of the engine failed at the same time unless there is some fuel contamination.
It’s definitely worth inspecting the connectors.
Thanks.
@@DadsGarageDiagnosticSpecialist Thank you I will check them out. my customer had the entire fuel system replaced due to his employee putting def in the fuel tank. It started acting up a year later so now I'm battling with it before we consider the injection pump etc
Hopefully, they cleaned out the fuel tank really good.
Let me know what you find.
@@DadsGarageDiagnosticSpecialist I will thank you
Why doesn’t the factory put dielectric grease on? Seems like it would solve the problem
They were probably being cheap. Haven’t seen this problem on any of the recent models yet.
GM does have dielectric lubricant available for service use, and there is a difference between the dielectric lubricant and the dielectric insulating grease.
I remember on a lot of older vehicles most of the under hood connectors had dielectric from the factory…. Fords had the white tacky grease in them, but they weren’t the only ones doing it. I wouldn’t be surprised if it was a cost cutting measure.
Thank you.
@DadsGarageDiagnosticSpecialist My 2020 just threw a code for number 4 injector. So they haven't done anything to fix this issue. Dealer wants 800 bucks. I'll be doing that myself lol.
@@bjenkins803Very very common.
If you are willing and able… That’s what this video and my channel is all about. Thanks for sharing.
@DadsGarageDiagnosticSpecialist I replaced the connector today. Fixed the problem and thanks for the video help.
@@bjenkins803 you’re welcome. Thank you.
Ours was a cylinder 5 connector failure took it off and cleaned it and put a bunch of dielectric grease in it cleared the codes and we were back on the road in about 2 hours. Going to trade the truck in there is no reason a 2020 should be breaking down like this! Never buy GM again.
Yes, cylinder five and cylinder four are the most common to experience this failure. I believe it has something to do with the harmonics of the engine and the vibrations being transferred up the wiring harness and it seems to affect these two cylinders the most.
@@DadsGarageDiagnosticSpecialistDoes LML have same issue? I have a 16. I have a P24BO PM sensor low voltage code. Any suggestions?
@2hotscottpro the LML does not have common fuel injector problems aside from fuel system failures.
Most likely you have a faulty Particulate Matter sensor.
@ cool I’ll order a sensor.I’ve been wanting to put a CP3 in due to I’m at 94k miles.
@2hotscottpro soak in penetrating oil for a week or two multiple times before you try to remove the sensor… they tend to stick and tear the threads out.
Can someone explain to me why my 2019 l5p and my 06 lbz both have the same injector 4 issue? Had to replace the whole injector on my l5p now not sure about my lbz?
Very unlikely that anything related is going.
The LBZ has injector failures at high mileage intervals.
Thanks.
Totally unrelated question, how do you keep your hands clean! I know, dumb question. But you didn't have gloves on in this video, so...
Great question. I use gloves a lot of the time for the convenience of being able to quickly take off dirty gloves so I can touch clean surfaces and it keeps my skin protected from all the harsh chemicals that I deal with all day.
I wash my hands multiple times per hour all day long sometimes…occasionally my hands get dried out from washing too much so the gloves can help keep the hand washing down too.
Thanks.
? why isn't there a recall?
That would cost the big corporation and all of their insider buddies a lot of money.
❤❤❤❤❤❤❤
Thanks!
I have been seeing many 2019/20s 2500/3500HDs for "Cheap" these days. Cheap by today's Pricing Standards. They seem to be going for what a 2015/17s are going for. Lots of common complaints and problems. Now I know why. Problems like this.
GM took a GREAT Engine and made it JUNK.
You then think Gasser, NOPE. I had a buddy recently buy a 2014 5.3L Silverado, truck in excellent condition, well maintained, only 114K on it, records to prove it. He got just past his first 3K oil change, engine gave up the ghost. NEW Engine replacement, well over 10K. The AFM/DoD is JUNK. I have read the GM went all in to "fix" the problem in 2019. Instead of having several cylinders be able to deactivate, they now theoretically can all deactivate. This just MAGNIFIES the inherent problems with that technology.
Don't think you can buy a Ford or Dodge though, they have their own problems, just as BAD or worse.
The Consumer BUYS in at PREMIUM PRICING, new or used, and own vehicles that are NO longer Reliable, Ticking Time Bombs, with Constant/Regular Shop Downtime.
This would ALL STOP if these Companies were Constantly HAMMERED with MASSIVE CLASS ACTION Lawsuits.
Vehicle Manufactures no longer put out Quality, they put out JUNK that is designed to be brought back to the dealership in order to feed the beasts, the machine, DRIVE PROFIT by fleecing the consumer.
My buddy that bought that 2014, it damn near financially broke him. He has two young kids, a mortgage, couple of pets, and saved to buy a "Good" used Truck for his family. That NEW Engine replacement cost him roughly half of what he paid for the truck. 114 000 miles.
Modern vehicles are designed to be throw away garbage.
Blame government regulation…. The true cause of all of this.
Also blame the consumer who time and time again finances and buys something they can’t afford. That is the American way.
Almost always cylinder 5
Yes I see almost always cylinder 4 or cylinder 5.
Cummins never has this problem. GM Duramax is poorly designed
Ehh Cummins has plenty of EGR and SCR problems to go around.
"...poorly designed"?? The "deadly dowel pin" is a proud Cummins problem...and fatal to the engine!! At least the crappy wiring and connectors on the Duramax only cause misfires.
The Cummins has its own inherent issues. Even worse quality is the chassis that it is living in.
@svenriemann3897 that’s what I’ve always said. Cummins is a solid engine I just don’t like the truck that’s wrapped around it.