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2015 - 2019 5.3L Ecotec3 Misfire Code P0300 (GM Truck Gen 5 V8) | AnthonyJ350 

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You may get engine trouble code (MIL Light) P0300 which is a "Random Misfire Code". Today we're going to go over a simple fix which may be affecting your GM Truck. Keep in mind there are other causes that may trigger a misfire code, so in this video we are going to go over the easiest fixes.
This issue may affect GM Gen 5 small block gasoline V8's in particular the ground location shown in the video. These trucks would be Silverado, Sierra, Tahoe, Yukon, Suburban, Denali, Escalade, Express and Savana vans.
#P0300 #Misfire #LTMotor #LSMotor #GENV #GEN5
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2015 - 2019 5.3L Ecotec3 Misfire Code P0300 (GM Truck Gen 5 V8) | AnthonyJ350
• 2015 - 2019 5.3L Ecote...
ANTHONYJ350
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Комментарии : 77   
@BoOmBaMan
@BoOmBaMan 3 года назад
Great way of deduction. 👍 Process of eliminating potential variables when you don't have a way of knowing what's faulty. Especially for those who don't have a scanner on hand. Reliable methods like this are invaluable.
@AnthonyJ350
@AnthonyJ350 3 года назад
Thanks Thizz!
@SarahC12347
@SarahC12347 2 года назад
I had a mystery misfire on cylinder #3 5.3l 2016 for sometime that Gm couldn’t figure out. It turned out after changing plugs and wires and swapping coils and even an injector, that it was the ignition coil connector. The wires had came lose in the plug. Bought a new connector and heat shrunk it on and it works perfect! Cost about 135$ Canadian from gm! Food for thought if anyone else is having a mystery issue.
@AnthonyJ350
@AnthonyJ350 2 года назад
Thanks for sharing your experience!
@margaretlankford3068
@margaretlankford3068 Год назад
Nascar race today
@nicholasebabyak3425
@nicholasebabyak3425 Год назад
Was it a P0300 code? Or was it a specific cylinder code?
@stealthg35infiniti94
@stealthg35infiniti94 3 года назад
Good job.! Audio, Lights, Aftermarket Equipment and now Diagnostic Troubleshooting Repairs....
@AnthonyJ350
@AnthonyJ350 3 года назад
You never know what we're going to work on next lol
@jbowden718
@jbowden718 Год назад
Great video. Just ran into this problem. Solved my P0305 misfire. Thank you so much. Went ahead and also replaced the fuel injectors because of the poor idling. 2014 Silverado with 69K miles, they were total trash.
@AnthonyJ350
@AnthonyJ350 Год назад
Nice! Is your truck the newer one with direct injection?
@jbowden718
@jbowden718 Год назад
@@AnthonyJ350 yes, it’s got the GDI engine. Unfortunately the intake ports looked terrible. I couldn’t blast it with crushed walnuts like I’ve seen done so I opted for a Lucas GDI cleaner. At $20 a bottle I hope it helps. They are not building these trucks to last past 150k.
@garlandtxcuh9497
@garlandtxcuh9497 Год назад
I move the coil in say misfire cylinder 5 in it say random misfires what can I be? I change the spark plug in the cable wire and the coil and still have the same problem
@AnthonyJ350
@AnthonyJ350 Год назад
Curious, watch this video and see if this is also your problem ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Rjy4sqzzHgI.html
@mishutkin101
@mishutkin101 2 месяца назад
Have po300 and po50d on 16 silverado 5.3 do i need new fuel injectors or sparkplugs?
@AnthonyJ350
@AnthonyJ350 2 месяца назад
Not sure
@G-shock-th7th
@G-shock-th7th Год назад
Where can I take my car is 2018 Tahoe has rondom misfire
@AnthonyJ350
@AnthonyJ350 Год назад
Broad question. What area do you live in?
@BrandogSalas-bi3nl
@BrandogSalas-bi3nl 9 месяцев назад
I second that hold ratchet by the top for precision fastening
@AnthonyJ350
@AnthonyJ350 9 месяцев назад
Thanks for watching!
@trevernash1260
@trevernash1260 4 месяца назад
Any chance you can share what values (misfire counts) are shown on your scan tool for all cylinders for the L83 5.3. I have some low count misfires that won’t throw a code just yet is there a normal amount of misfires for cold start and or when the engine is warm idling?
@AnthonyJ350
@AnthonyJ350 4 месяца назад
Vehicle is long gone and back in service.
@trevernash1260
@trevernash1260 4 месяца назад
Obviously….just trying to see if you know common readings for misfire counts on these motors…like are they all supposed to read zero when warm or do they have a few on cold start…that kind of info
@AnthonyJ350
@AnthonyJ350 4 месяца назад
@@trevernash1260 Sorry, I don't know that info.
@nathanielcorral1992
@nathanielcorral1992 Год назад
Me and my grandfather are very confused we have p0300 cylinder 1 misfire we tried moving the coil packs and the spark plugs and wires but it still stays we also replaced the purge valve Cadillac converters pcv valve when starting the truck it pings and the motor rattles just bought the truck a month ago any information would be greatly appreciated
@nathanielcorral1992
@nathanielcorral1992 Год назад
When starting the truck it also tells me to service stabilatrack abs trailer brakes we were thinking pcm
@nathanielcorral1992
@nathanielcorral1992 Год назад
*ecm*
@AnthonyJ350
@AnthonyJ350 Год назад
Look into this first. You might have a water leak in the roof ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Rjy4sqzzHgI.html
@TKess28
@TKess28 8 месяцев назад
I’m getting p0300 and a p0420 even after changing the cats, plugs, wires, o2s and coils but when I view the freeze frame it cycles between 300 & 303 so I’m going to change out the #3 coil again and see what happens if that doesn’t help do you have any other advice?
@AnthonyJ350
@AnthonyJ350 8 месяцев назад
I would go over all the factory ground, especially the ones from motor to chassis and body.
@TKess28
@TKess28 7 месяцев назад
@@AnthonyJ350 will do thanks man!
@cmr22
@cmr22 2 месяца назад
I have a 2015 chevy tahoe, gave me a p0308 and replaced coil and sparkplug. Now i get p0300. Any ideas
@AnthonyJ350
@AnthonyJ350 2 месяца назад
You replaced all the spark plugs and how many coils?
@cmr22
@cmr22 2 месяца назад
@@AnthonyJ350 i had replaced only the coded coil and spark plug (misfire cylinder 8)… so my dumb ass purchased all the coils but was to lazy to change them… so decided to change them all and new spark plugs and problem went away
@AnthonyJ350
@AnthonyJ350 2 месяца назад
@@cmr22 Glad you figured it out
@marcorivera5694
@marcorivera5694 2 года назад
Hey man I did the coil swap and it went from P0307 to p0300, do you think it’s the coil
@AnthonyJ350
@AnthonyJ350 2 года назад
Most likely if the problem moved to the position you moved the bad one
@davidlockwood254
@davidlockwood254 Год назад
2016 Silverado p0301 changed coil pack pulled spark plug oil on threads replaced spark plug and still same code missing when acceleration jerking flashing check engine light
@AnthonyJ350
@AnthonyJ350 Год назад
Look into this, you might have a water leak and potentially damaged electronics if changing those parts didn't help ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Rjy4sqzzHgI.html
@jc06gsxr600
@jc06gsxr600 11 месяцев назад
Lol they did that to eliminate the possibility of an injector ot bad lifter. Better to swap and test than throw parts at it
@luismejia5448
@luismejia5448 11 месяцев назад
@davidlockwood254 Did you ever find out what the issue was? My sierra is giving me the same code. I pulled the spark plug and also had oil. Replaced them all and swapped ignition coils but still giving me p0301 misfire. I’m looking into the fuel injector now.
@davidlockwood254
@davidlockwood254 11 месяцев назад
@@luismejia5448 mine was a valve spring and just ended up doing a dod/afm delete stage2 cam
@davidlockwood254
@davidlockwood254 11 месяцев назад
@@AnthonyJ350 valve spring
@TheChrisgralnic
@TheChrisgralnic 27 дней назад
I just did a cam and lifters on a 14 5.3 . It runs good now. The cylinder that was misfiring is now fine. But now i have a P0300 and a miss under load on #6. Could be coincidence and need an injector now. I have 180 psi on cyl 6. At idle i get no misfire count. But in drive power braking #6 misfire count goes up steadily. Any advice ?
@AnthonyJ350
@AnthonyJ350 26 дней назад
Did you try moving the coil pack, just incase?
@TheChrisgralnic
@TheChrisgralnic 25 дней назад
@@AnthonyJ350 Turned out to be a clogged GDI Injector
@AnthonyJ350
@AnthonyJ350 25 дней назад
@@TheChrisgralnic Ahhh ok. Glad you figure it out!
@marioncobretti7870
@marioncobretti7870 2 года назад
My truck just started misfiring in the cold, goes away when its got. My bets the intake valves caked in oil, because theres no fuel to wash the vales in direct injection engines. Huge problem in VW anyways.
@AnthonyJ350
@AnthonyJ350 2 года назад
Definitely want an oil catch can to slow it down. Tracy Lewis Performance makes a great one for these trucks rxcatchcans.com/ols/categories/catch-cans
@autoperformance503
@autoperformance503 3 года назад
What cause aggressive and Loud downshifts in some cars?
@AnthonyJ350
@AnthonyJ350 3 года назад
In an automatic?
@autoperformance503
@autoperformance503 3 года назад
@@AnthonyJ350 yes
@lookingood48
@lookingood48 11 месяцев назад
So my problem is I get the p0300 code and no follow up code to tell me the cylinder. You had the code and instead of replacing you moved it for the person to come back. Smh
@AnthonyJ350
@AnthonyJ350 10 месяцев назад
I did put in a new ignition coil pack, what are you talking about. We just moved it around to verify the problem....
@Yesyall777
@Yesyall777 Год назад
How much for repairs ?
@AnthonyJ350
@AnthonyJ350 Год назад
I don't remember. I might have been 3 to 4 hours billable time due to diagnosing and testing.
@TDinosor47
@TDinosor47 2 года назад
2015 Tahoe police package. Misfire #7 I changed #7 came back again Send it to the shop they saying we need to dig inside the engine to find out the problem.
@AnthonyJ350
@AnthonyJ350 2 года назад
Did you try moving it to another cylinder. It might be the wiring or pins in the connector.
@AnthonyJ350
@AnthonyJ350 2 года назад
What are they checking in the engine? Do they want to pull an injector out?
@TDinosor47
@TDinosor47 2 года назад
That’s what confusing me for a simple misfire and already cha
@AnthonyJ350
@AnthonyJ350 2 года назад
@@TDinosor47 I would check for a vacuum leak as well ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-yNeWl2czii0.html
@mikestillwell5566
@mikestillwell5566 2 года назад
P0300 is random misfire though... it doesn't really help nail it down
@BALJITSINGH-ez4nk
@BALJITSINGH-ez4nk Год назад
How did you fix U0401?
@AnthonyJ350
@AnthonyJ350 Год назад
Reseal the Onstar antenna that lets water in causing issues ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Rjy4sqzzHgI.html
@BALJITSINGH-ez4nk
@BALJITSINGH-ez4nk Год назад
@@AnthonyJ350 can code U0401 cause misfire? I am having P0301 and U0401. I already sealed that antenna.
@AnthonyJ350
@AnthonyJ350 Год назад
@@BALJITSINGH-ez4nk Probably can because it's a data communication error and the ignition and fuel timing is computer controlled.
@BALJITSINGH-ez4nk
@BALJITSINGH-ez4nk Год назад
@@AnthonyJ350 thanks, i suspect U0401 is causing misfire i swap coil and put new plug and wire, put new ABS sensor on 4 wheels, put new o2 sensor on s1b1 and still getting misfire and U code. i will check wiring.
@AnthonyJ350
@AnthonyJ350 Год назад
@@BALJITSINGH-ez4nk I would also check for water damage
@llcool3004
@llcool3004 Год назад
Why just swapped out coil in first place
@AnthonyJ350
@AnthonyJ350 Год назад
What if it's not actually the problem?
@mlaautomotivellc9327
@mlaautomotivellc9327 Год назад
P0300 Cylinder #1?
@AnthonyJ350
@AnthonyJ350 8 месяцев назад
It's a misfire code. Need to verify which cylinder.
@vigusfinlay8649
@vigusfinlay8649 2 года назад
Where is the P0300?
@AnthonyJ350
@AnthonyJ350 2 года назад
That's the engine code
@vigusfinlay8649
@vigusfinlay8649 2 года назад
@@AnthonyJ350 yeah.. But you did the cyl 1 sapped to cyl 5. Maybe that means P0301 and P0305. What's your basis that the P0300 code refers to Cyl 1 or Cyl 5?
@animatedmammals
@animatedmammals 2 года назад
My 2017 Silverado is throwing p0300 but no specific cylinder code. I think that is what he meant.
@davidbenitez6469
@davidbenitez6469 Год назад
@Vigus Finlay , P0300 means multiple misfires maybe from multiple cylinder. Could be wrong.
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