Service1956

Bought a new Tahoe back in April 2025. Had just over 1000 miles. It started having occasional rough shifting, and hunting for gears. One morning I tried backing out of garage and would not move. I then tapped on the accelerator ( in reverse ) and it slightly banged into reverse. Some time later the check engine light came on. Went to the dealer and they found codes: B1A1F, U0401, and U1616. The work order states: Found updates for image processing module. Installed updates. After that, it corrected the problem and no more erratic shifting and goes into reverse smoothly.

After watching the video, guy mentions oil life monitor. Waiting near 0% and having 7-10000 miles. Sometimes up to 12000. And then wonders why it uses so much oil.

I am thinking about buying a new 2025 Silverado pickup. So lately "Here in Michigan" I have been looking at what others have, and noticed that quite a few have upper rear fender rust through. The lower parts of the fender ahead and after the wheel look fine with no rust. Looking at the rest of the truck, lower doors, front fenders and lower tailgate show no rust at all. Not good at determining what years these truck are, but they do not seem to be that old. Does anyone have any info as to how old these truck get when you start seeing rust?

Looking at engine oil cooling lines when changing oil. They are leaking where the rubber is crimped into the aluminum. Yea it's 4WD. But I can still get at the 10mm bolts that go into the engine block above the oil filter. The real problem is replacing, that seems to be a difficult job from the block to the radiator. I am thinking about a delete that would eliminate the hoses by buying the GM bypass block that came with other trucks without engine oil cooling. I would be driving it without hauling or towing. Dealer wants $725 to replacing the lines. Would doing a delete cause any issues in the future?

Today I noticed that my front drivers side wheel had more brake dust then the passenger front. So I jacked up both front wheels and found that the drivers side turned freely. Removed both wheels and found that the drivers side pads had more wear. Not a lot but you could tell in comparison. Rotor looked good. No sign of excessive heat. I could easily turn the rotor with wheel off. So I removed caliper to check the slide pins. They were free and had grease. Pads moved freely on the shims. Could not figure out why more brake dust on drivers side. Put it back together and went for a drive. Got going at 45mph and braked hard. No pull to one side and no noticeable problem that I could tell. So I jacked up drivers side and pressed on brake pedal quite hard several times and got out and wheel turned freely. Could sure use some advise on what to look for.

First start in the morning using key fob will barely start truck. It seems like the starter will not stay engaged long enough. Now what I mean is that the remote start system cuts out power to the starter too quickly. If I manually start it with the key, it starts normally. Cannot figure why the system does not allow starter to engage long enough. 2011 Avalanche with 5.3 engine.

My truck has the 5.3 AFM engine. After I start it " cold or warm " the idle spikes to a little over 2000 RPMs and falls quickly to normal idle. This started last summer even in hot weather. If I drive 20 or more miles and shut it off, then immediately restart it, the RPMs quickly rise then fall to normal range within a few seconds. The computer shows no codes and the truck drives and behaves normally after that.

Just wondering if you could eliminate the screen filter without having other problems?

First off, I feel that not only me, but others that have read all of the rants on how the 5.3 AFM engines have been incorrectly labeled as being mechanically prone to failure has been over blown. Sure, I do realize that they were not the most trouble free engines out there. People must consider the fact that all manufacturers have their own set of problems. When mechanical engineers put their knowledge to work, they do so in ways that in theory will work according to what they know. When a design is studied, researched, and changed several times does the team approve of making it's way to the final phase of it's actual development. For the most part, the problem of 5.3 AFM engines using oil have been primarily with the 2007-2008 model years. The updated lifters I think arrived around 2010. The low tension piston rings were a design to save fuel by reducing friction and came with an added bonus of a longer lasting cylinder bore. The thinner oils such as the 5W-30 that these engines use, and the 0W-20 that my wife's 2015 malibu uses, have the same design factor.... by saving fuel. Both my 2011 Avalanche, and my wife's malibu both use "some" oil. Never had to add between changes. So what's the big deal if an engine uses a little oil? I think the best a person can do is eliminate the 6000-7000 mile synthetic oil changes that some do because they believe that synthetic oil last longer than the petroleum based products. The problem is, is that letting it go that long contributes to the problem of too many hydrocarbons building up in the crankcase and mixing with the oil therefore contaminating the oil in reducing lubrication and speeding engine wear. I could be wrong, but that's my theory. I really don't think these engines were that bad according to what some say. In the future............we will be faced with a new set of problems regardless of who the manufacturers are.

No oil consumption on my 2011 Avalanche. Been using the Range device shortly after getting my truck. Has anyone heard if any of the 2013-2015 GM 5.3 engines of having oil consumption issues?

I would not give any dealership the leverage to possibly void a warranty. Several years ago, if someone wanted to turn off A.F.M on a truck, and needed warranty service work, they then turned A.F.M back on and the dealer would more than likely not find a "History Code". To do that now, means that the dealers are more aware of what goes on , and are more likely of finding that information. Having said that, they now have proof that the vehicle was computer altered! Will that void the warranty?

I do not have any oil consumption issues. I did however had the new updated drivers side valve cover, and AFM oil deflector installed while it was still under warranty.

It's been a while since my last post. I am back just to say that when I had my last oil change from the dealer, the service manager told me that next time, bring it back when the oil life monitor is at 25-30% I asked him why? He did not go into a lot of detail but, basically said that this way the oil still has some "life" to it and won't be as dirty. Better for the engine he adds! Go figure. Sounds to me that they are thinking having the oil changed sooner will help illiminate the oil consumption issues.

O.K. Here is the information you people want to see. In Google Search, punch in..... Document ID: 3242444. It is the first topic on the list. (PDF# 100601008G EngineOil Consumption on Aluminum Block/Iron Block). It will give you 8 pages of detailed information that mechanics need to properly service this problem. Including Build Prior dates to inform you that it may be possible that some 2011 already have the updated parts! Now on the first page, under "Condition", last sentence reads: It is no longer necessary to have the customer return multiple times to have the usage verified. I came back to add that if using Firefox, the document will download to "Downloads" in the tools tab.

It's been a while sence I have been here. And it looks as though more people have been reporting about oil consumption issues. I am here to say, and, report on the facts that need to be discussed here. First off, GM has a T.S.B. that states that there is no longer a manditory oil consumption test for this problem. Second, is that if you already have the problem, that an oil relief valve deflection shield & drivers side valve cover replacement will not work on correcting the problem! It must be said that pistons & rings must be replaced along with the shield & valve cover to insure a long time repair!! The shield and valve cover replacement "WILL NOT WORK" if rings are already gummed up!! Late 2011- present vehicles have had these updates from the factory. Now I drive a 2011 Avalanche that did not have these updated parts. So here is my story. After doing much research, I have found enough information that I took with me to the dealer, and showed him what I have found. He looked at me and said.......where did you get this information? I told him, and said that I would greatly appreciate it if you would install the updated parts based on the fact that it was within my best interest to keep it from happening to me. He then asked me when I could bring it in and have it done. Made the appoinment fully covered under warranty. The dealer did the work in addition on informing me that I already had the "updated valve lifters". That part I did not know!! I am very certain that an oil consumption issue of this nature will not happen with my truck!!