Now that, my friend, is a smart suggestion! It would work kinda like hybrid mode cars.... sometimes electric, sometimes gas!!

I liken the AFM mode to the old automatic seatbelt "mice" that ran up and down the post to "force" you to wear your seatbelt.... remember those!? When the government steps in (with regulations) to "Help" us, we are usually gonna get the sharp end of the stick....LK

 

I don't think they could simply disable it in every mode other than ECO. Would have an enough of an adverse gas mileage effect that the EPA and CARB would be up their asses like VW and it's Diesel engines.

 

Then they could at least have disabled it completely in ONE of the modes. I don't know how the CAFE regulations work when it comes to cars like the C7 with AFM but I would think that if the car defaulted to having AFM on every time it started, that it could be tested for CAFE under that mode.

 

Wouldn't most of this fall under the power train warranty if the B to B warranty expires?

 

The C7 M7 trans only goes into AFM in ECO mode.
I guess they get away with it because of Fleet MPG average or what ever ?
Why wouldn't they be able to do the same with the Autos.

When I drive in V8 for long periods and monitor the V8 MPG is lower, but, very close to V4/V8 .
Not that I care, but in constant V8 mode, the fuel needle does go towards empty a lot faster
OTOH, I have no idea why they wouldn't do it

 

I have used the Range device for 1 1/2 years with ZERO problems. Works great and has never thrown a code or let the engine to into V4 mode

 

I don't discount anyone's opinion on how they will handle the issue. It is ultimately up to the individual owner. My biggest problem with the V4 mode is that the dang mode pops up just to much while driving in town. That's where I'll use the Range all of the time, because in my little mind that's where the most wear will happen. If I'm on a long flat interstate I'll may just let it do it's thing, but I'm still undecided on that point. If I trusted the Tech's at my local Chevy dealers enough I might just forget about the Range. But, I would rather not let them do major surgery on mine if it can be avoided. The cost of the Range, and the hope it will keep me out of that situation is well worth it to me.

 

I'm almost tempted to get my future 2018 tuned in order to remove AFM completely, even knowing it might void the powertrain warranty. The only claims I see people posting about on here are transmission related, I have yet to hear of a single person on this forum that had issues with their engine. Of course, if Range could just come up with a 100% reliable unit that doesn't set off CELs or lock the trans in 4th gear, that would be my best choice. Maybe by next spring when I get my C7 they will have finally come up with a reliable Range unit!

 

That's what I did, but I have modder's remorse about it... I'm hoping I was proactive enough in telling the service manager in advance what and why I was doing a tune, but she was pretty clear that it nuked my powertrain warranty.

That said I now have the best of both worlds... AFM off when I don't want it, and I have a tune that locks it out until 54mph as well. Right now I'm running with it totally off because of the durability problems people have reported. I initially turned it off because of the sound, but kept it off because of the TC clutch.

 

" I have yet to hear of a single person on this forum that had issues with their engine".... My car is at the dealer now. The dealer found metal in the oil filter (which is bad). They haven't done anything for a week and a half because GM told them not to while GM tries to figure out how to not cover it under warranty.

DO NOT DO ANYTHING TO GIVE THEM AN EXCUSE TO VOID THE WARRANTY. They will take it. I've followed everything to the letter (and beyond) to maintain the warranty and as soon as there is a major problem they reject the repair and try to dump the cost on me. Given GM's current attitude on everything, be very cautious.

 

That would be sad indeed if true... assume you are within factory warranty or is it drivetrain!? Either way, for what these babies cost we should expect GM to stand behind them.....IMHO....LK

 

Warranty issues not involving a modified controller or drivetrain usually are due to the behavior of the dealership. The biggest shortcoming of GM is very poor control over their dealers (and thus the customer dealership experience) and this is NOT a recent problem. The dealer is the boundary spanner between the customer and GM corporate and if the dealer does a good job the customer does not suffer grief. But if you have a dealer who doesn't completely and properly follow GM inspection requirements and procedures for a major powertrain repair prior to warranty approval then it will be a long process which the dealer will then blame on GM corporate.

In 2002 I ran into an issue with another Chevrolet model where every time it rained the car would trigger an ABS system warning. The dealership diagnosed the problem as a wheel sensor issue and replaced it three times with no success claiming that they kept getting defective sensors from corporate. The service manager then stated their next step for this less than one year old vehicle was to replace most of the wiring harness in the rear of the vehicle. This would be pretty major surgery and through another contact at GM I got engineering involved who had a representative dealing with another issue in a nearby city and he stopped by to assist the dealership. He reported to me that the problem was there was a code indicating that the right rear wheel sensor was at fault but the dealership kept replacing the LEFT wheel sensor. His advice was to use another dealership for any future issues, preferably one that had techs who knew their right hand from their left hand. GM did provide a free extension of the bumper to bumper warranty to make up for the trouble.

 

First thing I did after getting my '15 was to hand pick the best service adviser our Club Members could recommend, make an appointment and assure him he would be my guy... has been very pleasant dealing on warranty things from there, good communications and I admit to dropping a little "gift" onto his desk when major warranty replacements recently took place..... they have a lot of guff to deal with given some owners, but hopefully my dealer team will continue to deliver great service. I KNOW I should not have to gift the guy, but I did it happily!!

As NSC5 points out, the dealer is the prime interface between us and Gm and if they are not motivated and diligent it can make OUR life and experience miserable.....smile...LK

 

LK is handling it right! When I bought my first diesel pickup the dealership had one tech who handled any diesel pickup issues. When it came in for its first service I brought a couple of boxes of Krispy Kreme donuts in which the tech appreciated, partly because it gave him something to share with others in the shop. I have always gotten excellent service from him.

Also many times you will not be able to speak directly with the technician and things get garbled going from you through the service manager to the tech. When there is a complex issue I always put a concise note explaining the exact symptoms and how and under what conditions they occur in the car and provide another copy of this note for the service manager to attach to the form. This way the tech gets precise information and nobody gets their feelings hurt since the service manager has a copy of the note for his/her official paperwork. Like other aspects of life clear and concise communications are often key.

 

Avoid upshifts while tires are spinning. Not always easy.