Jump to content

p0300 misfire code

drivereye
 Share

Recommended Posts

TexasBaseballDAD New Member

TexasBaseballDAD

Posted
Posted
On 6/11/2021 at 6:58 PM, Mobud said:

Did switching gas help with the misfire? My 21 Sierra has done it twice now dealer found p300.

I have a 21 AT4 5.3 V8, and I've had the check engine come on showing the same code, however, it went away.  I recently took a long trip, filled up at a local Walmart after I got back in town.  Fast forward a few days and my truck has developed a bit of a shake when driving, along with a bit of a slip when coming to a stop, along with check engine light flickering some.  Not sure if you have had the same symptom, but I am curious if I put a bad batch of gas in my truck.  Was curious if you have experienced the same.  

Mobud Enthusiast

Mobud

Posted
Posted (edited)

So I thought too maybe it was bad gas. Took to dealer once had generic 300 code then light flashed again stopped by dealership said it was same code so a tech went and go scan took I had misfires on 1&6 said they’ve had a lot of issue with the lifters collapsing due to a bad batch of parts. So next week they’re replacing all lifters.the tech also said usually by 5000 miles they will fail I’ve got 2700 on mine.

Edited by Mobud
Belo Enthusiast

Belo

Posted
Posted

this happened to me a few weeks ago and then shutoff later the next day. mine was unsettling as it came on while driving through some fields (hey it's a truck right?) nothing reckless, just pulling a turkey blind. Never noticed any performance issues but for having less than 10k on the odometer and just 2 years old... 

  • 2 months later...
Mobud Enthusiast

Mobud

Posted
Posted

So I’ve had both banks of lifters replaced in mine at about 2500 miles. Went another 2500 check engine light came back on supposedly had to relearn the cam shaft position sensor. Lasted two weeks came back on apparently they are waiting for GM to rewrite code but they can’t figure out how to fix the issue and that was a month ago with still no update. Good luck

usmcav8or Enthusiast

usmcav8or

Posted
Posted

I have a week old 1500 AT4, just threw the P0300 code with 967 miles on the truck, this is my very first GM product, holy crap, why can't American companies build a reliable product?!!  I don't want to drive a Japanese truck, but damn it, American cars are so freaking awful :(   I don't have time in my life to take cars to dealers, if this keeps happening, it's back to Toyota (where I NEVER had a single freaking issue with two of them in over 250,000 miles combined!)

  • 3 months later...
Ed tha man New Member

Ed tha man

Posted
Posted

I'm following this thread.  My 2020 Sierra started with the check engine light flashing for 10 seconds.  Dealer puller the p0300 code.  The next day the truck shook with the check engine light and service ECS system.  Restarted the truck it went way.  Too bad I'm at 37K with just over one year of ownership.  

  • 3 years later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • KARNUT
      Towing In Loose Gravel

      By KARNUT · Posted

      First off use it in the way you’re more comfortable. In working in off road situations most of my life I used 4WD low range very little. In most cases when equipped I used auto 4WD. If I wanted maximum control going up and down very steep terrain  I used low range. Especially if I was driving a diesel. Same with very rutted terrain. In very muddy or snowy conditions I wanted momentum so high range worked well for that. With gravel ramps with limited traction I would try high range first. I would want smooth even increasing speed if I was fighting traction. Low range could give you too much to the wheels breaking traction trying to move. 
    • Z45
      Towing In Loose Gravel

      By Z45 · Posted

      Having owned 4wd vehicle since the 1970s I find there are varying opinions on how to use 4wd, every owner is an expert in their minds.  IMO, 4LO is the appropriate gear and what I would use,  You have to feather the gas to avoid spinning tires and the lower the gear the better chance.  But like I said you will find those that think their method is best.  I live near a boat launch.  Yesterday there was a new Ford Maverick pulling out a pontoon boat almost 2x its size, they had no problems and they don't have a LO range.   True story. One winter day not long ago I was coming out of small town post office and there was a F150 4wd parked in front and was stuck foot deep snow ruts. I knew the lady so I asked her to put it in 4wd (wondering why in the middle of a 2-day snow storm she wasn't).  Her reply surprised me, "my husband" (the expert) told me not use that because it uses too much gas. She finally got unstuck spinning in 2wd which likely used more gas than not.  
    • dna9656
      New to Me 2010 SLE (Quirks, Issues)

      By dna9656 · Posted

      Your tire pressure issue may just be batteries, you can reset them using tge Ing switch (I think) and the owner's  manual. ChatGTP will b e a faster, better help than Google.
    • Another JR
      Towing In Loose Gravel

      By Another JR · Posted

      The thinking is that starting out in a higher gear makes it easier to avoid applying excessive torque when pressing the gas pedal. In a modern 4wd truck with 4 low and a limited slip or locking rear end, I would use 4 low and try to crawl up the ramp. Sometimes if they are too slippery, you have to back up to let the boat have some bouyancy, and then accelerate briskly to get some momentum to help you pull the through the slippery parts. 
    • XY74
      Roll up bed cover experiences

      By XY74 · Posted

      I have a Retrax pro that I first had on my 2020 chevy and transferred it to my current GMC.  It stays in the garage most of the time, so hard for me to judge it's long term weather resistance.  It still works perfectly, been very durable.  It doesn't see oil patch usage, but it's not a mall queen.  It keeps most things mostly dry (small leaks) and the security of it is enough to slow someone down but not keep them out for long.  I would buy one again, it works for me.     

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...