2015 Chevrolet Silverado 1500: misfire or rough idle

Filed Oct 8, 2026 · Engine, Transmission · IL

A lifter failed and caused an injector to fail and a push rod to bend. The truck has misfires on two cylinders now. The AFM system is a large issue known for 2014 and newer 1500 trucks as mine is a 2015. The truck is in need of a motor rebuild or replacement and the dealer I took the truck to for the work quoted me over $9000 for the work to be completed. The engine has less then 125,000 miles on it.

Filed Sep 15, 2026 · Engine, Transmission · IN

I am filing this complaint regarding a serious engine lifter/Active Fuel Management (AFM) failure in my 2015 Chevrolet Silverado 1500. The vehicle experienced a lifter failure that caused significant engine problems and created a potential safety concern while driving back from shopping: loss of power, engine misfire, severe shaking, ticking, check-engine light, stalling, inability to maintain speed, etc. The vehicle had approximately 200k miles at the time of the failure. The vehicle was inspected by a local mechanic, which diagnosed the problem as collapsed/failed lifter. The repair required/will cost approx. 3k or more estimated My concern is that this does not appear to be an isolated failure. Other owners of 2015 Chevrolet Silverado 1500 trucks equipped with GM's Active Fuel Management system have reported lifter failures, including failures resulting in engine damage and sudden loss of engine power or propulsion. A sudden lifter or related engine failure can create a significant safety hazard, particularly when it occurs at highway speeds, while merging into traffic, crossing an intersection, or in another situation where the driver depends upon the engine to maintain acceleration and vehicle speed. I am reporting this in hopes that GM can be held accountable as they knew about these defective lifters but did nothing but hide it.

Filed Nov 7, 2025 · Engine · OK

86K miles smelled gas. Dealer replaced one fuel injector on the 6 cylinder rail. At 108K miles, catastrophic engine failure caused by misfire in the #6 cylinder. No compression or diagnostic testing done at initial fuel injector replacement. It is now my understanding that it is good practice when replacing one fuel injector, all should be replaced. After truck was inoperable at 108K miles, ran a borescope into the 6 cylinder shaft and noticed massive wash and scoring. Goodwill from GM was denied for an engine swap. Subsequent diagnostic testing revealed low pressure in all cylinder heads. I don’t put a lot of miles on this truck per year and suspect the problem compounded over time without notice. There was gas mixture in the oil, however this issue was never brought to my attention during routine maintenance and oil changes. I know there were issues with the 6.2L and didn’t know of parallel or residual issues with the 5.3L. Long story short, I had to go with an engine swap on a truck with relatively low mileage.

Filed May 1, 2025 · Engine · PA

I bought this truck a little over a year ago. Mileage 89,392. 2 weeks later the truck started to run poorly, shaking badly, misfiring. Took it to the garage. They told me the had to replace coil packs one one side lifters and one push rod. Truck ran good for 1 year. I know this because I had just gotten it inspected. A couple days later the truck started doing the same thing. Now it’s in the garage again. They tell me the camshaft is shot and needs replaced including all the lifters. The truck now has just over 100,000 miles on it. The repair is about $6600.00. GM will allow the garage to do some work under a warranty type citation and GM will pay approximately $535.00. For a total of about $1000.00. Now my concern is this truck could break down on the highway and cause an accident just like a current recall for crankshaft and or connecting rods. If there can be a recall for that there should be a recall on this issue also. The garage has informed me they have done a lot of these repairs. Some even had to come back a second time.

Filed Apr 22, 2025 · Engine · FL

Number 7 cylinder valve failed. “Good Morning Mr. [XXX] . I have some updates on your vehicle. Based on my technicians inspection cylinder 7 is misfiring. He removed valve cover and found a stuck rocker arm caused by collapsed lifter. may need camshaft will know further when engine is tore down.” Then they quoted an outrageous bill. This is an on going issue with General Motors. Why is this not being fixed by the corporation? The truck doesn’t even have 100k miles on it and it’s been kept up routinely. I am the original owner and feel that problem has been going on for over 10 years now. GM should be held accountable. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jan 27, 2025 · Engine · NV

While driving at 55-60 mph on Saturday, [XXX], the vehicle made a distinct engine sound and lost power, but continued to run with a pronounced misfire, and a ‘check engine’ light came on. Our safety was put at risk because we were merging into high speed traffic and I had to abruptly slow and move as far out of the travel lane as possible. I had the vehicle towed to Champion Chevrolet in Reno on Wednesday October 16 for evaluation. The mileage in was 44,252. I was told that the camshaft and some lifters had failed, and I opted to have the engine replaced with a remanufactured unit at the total cost to me of $14,660. I picked the vehicle up on 10/28/2024 with 44,259 odometer miles. I have since learned on the internet that this particular ‘Active Fuel Management (AFM)’ failure is known to Chevrolet corporate office and is the subject of a class action lawsuit against Chevrolet. I have also learned that there is the possibility of repayment to affected owners in early 2025. I am submitting this letter to bring my situation to your attention so that I am included in any list of owners that may be reimbursed as a result of this known engine issue. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Nov 30, 2023 · Engine · 70,186 miles · AR

The contact owns a 2015 Chevrolet Silverado 1500. The contact stated that while her husband was driving 75 MPH and overtaking another vehicle, the engine made an abnormal clunking sound, and the check engine warning light illuminated. Additionally, the engine started making abnormal knocking sounds. The contact's husband pulled into an AutoZone parking lot, where it was diagnosed and determined that cylinder #6 was misfiring and that the knock sensor had failed. The contact stated that her husband replaced the parts; however, the failure persisted. The vehicle was towed to the residence. The vehicle was then towed to the dealer, where it was diagnosed and determined that cylinder #6 was misfiring. The dealer determined that the lifters needed to be replaced. Additionally, the dealer informed the contact that further inspection was required to determine whether the camshaft needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 70,186.

Filed Jan 9, 2022 · Engine · IL

Lifters collapsed Got it inspected by a dealer Check engine light came on for a misfire

Filed Mar 23, 2021 · Fuel system, Transmission · 91,000 miles · LA

Fuel system is going bad have to replace fuel injectors at 90,000 miles. Keep a check engine light on and makeing cyl 6 misfire. Replace all of the spark plugs and wires and still not fix.

Filed Jan 2, 2021 · Engine · 79,600 miles · AZ

With only 79,600 miles the engine began misfiring. We took it to 2 independent mechanics and were told the lifters needed to be replaced causing $5600 in repairs. We were followed all the recommended oil changes and maintenance. After investigating it we discovered this engine failure was known to gmc as it has effected several other gmc truck engines manufactured between 2011 and 2014.

Filed Nov 20, 2020 · Engine · 83,000 miles · KY

My truck had an afm collapsed lifter failure. It occurred under a hard acceleration event to change lanes. The dealer replaced the lifter, returning the vehicle to me. I got down the road, tested it under hard acceleration and it happened again! This time there was a lot of internal engine noise, really loud. I asked the dealer if they ntested it under a hard acceleration; they did not. They replaced the #6 piston and the valves associated with the #6 piston. All work performed was done on #6, even the initial collapsed lifter. I picked it up again and again a hard acceleration produced misfires! I had it towed it back to the dealer and asked them if they had tested it with hard acceleration. The response was @ 3300 RPM. I told the service writer that, if you do not test it under hard acceleration you will not even have it misfire! He redid the test and voila, he can see it now! Technical resources told them to replace vlom, or "valve lifter oil manifold". I got it back and it does work, more or less. A hard acceleration will produce uneven acceleration but without the previous issues. I am working for now. I conducted some further research which I am probe to do and found an acdelco youtube video: https://www.youtube.com/watch?v=mkly7xmmsos&feature=youtu.be&fbclid=iwar2zvzpvj6z6e3seljzgvxzeru8ptllkgpkqtfxmrsns7oqencolhrrgi_i. This video states that if you have an afm levent that involves a collapsed lifter you must replace a plethora of parts. That was not done. I have changed my oil on a more frequent basis than gm requires and I use amsoil signature series10w20, the best you can buy! I also use their ea0 filters which state you can go up to 25k miles or 1 year between changes! I typically do 10k miles as a high point. I have swicthed preferred dealers to get a different technical response...help!

Filed Oct 8, 2020 · Engine · 8,400 miles · AR

Tl* the contact owns a 2015 silverado 1500. The contact stated that while operating the vehicle, there was an engine misfire prior to the vehicle stalling without warning. The failure had recurred on several occasions. The vehicle was taken to the local dealer mclarty danial chevrolet (1159 n 45th st, springdale, ar 72762) and diagnosed that the engine valve lifters and fuel management systems were defective. The contact indicated that two valve lifters were replaced by the dealer. The failure continued after the vehicle was serviced. The manufacturer was notified of the failure. The VIN was not available. The failure mileage was 8,400.