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I have a 2014 Silverado LTZ, with a 5.3L engine. There is approximately 145,000 miles on the engine. I have a misfire on the #3 cylinder. I have replaced the induction coil on the #3 cylinder, but I still have a misfire on this cylinder. My mechanic says that the lobe on the camshaft is worn and the camshaft needs to be replaced.
I would think that if the lobe on the camshaft is bad then other lobes would also be bad, a defective camshaft.
Has anyone else had this problem? Does anyone have any suggestions as to what might be causing the misfire.
Thank you in advance for any advise the you can provide.
By The Pig Dusters
Okay guys I bought this truck from a dealership in September. It was used and I got a 30 Day warranty. After the 30 day period, this is what’s happening. I got in my truck and noticed a rough idle. My truck would shake and out of no where the check engine light starts flashing and my traction control light comes on. I took it to my buddies and we got a P0308 Misfire Detected Cylinder 8. So I did some research.. I also had a code which was P219B. Air/fuel mixture ratio.
I changed the spark plugs.. didn’t work. I moved coil packs.. the misfire didn’t move. So we watched Live data on the scanner and injector 7 was acting up. So we replaced all the injectors on that side and this truck is still missing.. I’ve ran seafoam through it and cleaned the throttle body and MAS. My buddy things I have a valve issue or something wrong with the cylinder…
there is no AFM deleted or anything of that sort. The truck has worked flawlessly until now. 135,000 miles on it. The rocker arms all
please someone give me something to try. I just want my truck fixed lol.
posting a link below of what it’s doing…
Unfortunately this is my first post here. But thought my info would be helpful to others. My new 2022 GMC Sierra 1500 AT4 Limited with the 6.2 has been in the shop for a couple days due to lifter failure. The truck had right at 6,000 miles on it when the lifter collapsed and bent a push rod. I called the dealer for an update, and they said parts should be in in the next day or two, then they'll replace the affected bank of lifters..... I asked why they won't replace both banks since the failure occurred in less than 8,000 miles? They told me that particular TSB procedure stopped at the 2021 model year. The 2022's will only have the affected bank side replaced even if failure occurs in under 8,000 miles on your brand new truck. I've opened a case with GM directly to try and get both banks replaced since the parts still seem to be substandard. I don't want to be pulling my camper with my family, and have the truck fail on me again because they only replaced half of the defective parts. I can't even get a loaner from the dealership while the truck is being fixed.
Aside from this current headache, I absolutely love our new truck. No plans on getting rid of it, I just want it fixed the right way with parts that aren't inferior.
Edit: The truck has a build date of 12/21. Unsure of engine build date, but have to imagine it's close to the truck's build date.
By Andrew Selinger
I have 2021 AT4 with the 6.2L, just recently a check engine light has come on and am a bit stumped on it. I have read the codes on the ODB11 and the reader I have shows a P2CB9 code but it give me an "information unknown" reading. My GMC app however tells me that nothing is wrong and all systems are normal.
I search online and find that the P2CB9 code is a "cooling fan 2 underspeed" however I live in Canada, its -25 degrees Celsius outside and there should be no reason that cooling fan 2 needs to run, or if I need to get it to run, its too cold out to try and get it to engage.
Would taking the negative battery post off reset this code? its not like its immediately urgent in my life to get it to the dealership due to im not worried about it overheating, but its blocking my command start from working and its pissing me off because its cold outside.
Am I chasing the right rabbit?
Thanks in advance
I have a random problem, where the system plays the FM Radio and Spotify at the same time and the GPS is blocked. This also so has the side mirrors fold in half randomly. I have to stop the vehicle and get out close the door and wait several minutes then restart the truck. Sometimes it take 3-4 trys to clear this problem. The Dealership is useless, because there are no Codes showing. Anyone else have this problem?
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