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[ANSWERED] Why can you not just disable the AFM?

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[ANSWERED] Why can you not just disable the AFM?

Old 03-14-2018, 11:20 AM
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The EPA numbers for both cars are in the "default" setting, which is Tour mode. When the EPA tests are done, the car isn't allowed to be changed into a non-default mode.

AFM is on to various degrees in all but "Sport" and "Track" with the automatic transmission. Which means it may very likely contribute a small amount to the automatic's EPA numbers for the highway. The goal here is to reduce the GG tax on the automatic cars.

AFM isn't on in any mode for the manual except "Eco". So it doesn't have any play when it comes to the EPA tests.

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Old 11-16-2018, 02:09 PM
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Take a look at the latest version of this bulletin! Dated October 10, 2018

2nd block in bold text.
GM is telling dealers not to fix the shutter! WAIT UNTILL Q1 of 2019!!
What?? SO... your corvette is broken and they don't know how to fix it; well they do but its only temporary and don't want to have to replace TCs multiple times.
Just park that Corvette in the garage and wait. and wait. and wait. I'm sure 'they' will figure out 'something'...
If you got an automatic C7 get rid of it & if your thinking about buying one DON'T get an automatic.
one other note: if your have a convertible the shutter is WAY worse; the entire roof of the car acts like a speaker amplifying the vibration... basically shaking the fillings out of your teeth!
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Old 11-16-2018, 04:01 PM
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Default C7 AFM issues

So the original thread had to do with the shudder caused by the AFM. The shudder was a failing torque converter caused by the AFM. Not just corvettes but any GMC , V6 or V8. I had a friend with a V6 Impala that also needed the torque converter replaced. Fortunately Mine STILL Had 2 WEEKS Left On the warranty. Since I have installed a AFM disabler by Range. It works great. I've had it about 6 months and have about 3500 miles using it. If I can maintain 70 to 75 mph I still get 32 mpg so I honestly don't see that the AFM bought me more than 1 mpg. Not sure the connection between the converter and AFM but Chevrolet knows there is one. They have a service bulletin to flush the transmission to fix the shudder but mine with 20,000 miles was too far gone.
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