Newton06

I read about these failing for those that track their cars and thought it was mainly autocross.

At the last VIR full event with temps in the mid 90's I threw P12F0 & P12FD codes.

Will GM replace these if you have LT's & x-pipe installed?

Will removing fuse 32 eliminate the CEL?

Thanks!

mallett435

I'd be curious what your dealer says. I just installed ARH mid lengths with high flow cats over the weekend. Then, ran at Watkins Glen and AFMs failed (not the first time). I always just cleared the code after track event and the CEL never came back on until next track event. Now, it seems to be on the permanently. Figures! I still have factory tune.

BaylorCorvette

If the AFM actuators failed the CEL will come on every time you start the car, even if you clear them. The car goes through a "boot cycle" each time it is turned on and checks all the sensors, I know this because I've experienced it first hand.

The dealer SHOULD cover it under warranty because it is a known issue to happen to 100% stock cars. Even Tadge somewhat acknowledged the issue in the fact that '17+ manual Z51's and GS's will no longer have AFM actuators. However it is possible the dealer won't cover it since the exhaust has been modified. FYI those actuators cost over $800.

Newton06

Thanks.

I've tried removing fuses 32 & 42 to no avail.

Clearing the codes causes them to come right back as you have stated.

Guess I'll have to take it to the dealer.

SocalCyberZ51

Removing fuse 42 keeps the valves open and all four exhausts flowing, correct? Will removing fuse 42 prevent failure or am I oversimplifying?

owc6

BaylorCorvette nailed it.

Even if you never enter 4 cylinder mode, your car tests this at every ignition cycle upon start-up.

X25

I don't think it would ever happen during an autocross; where did you get that idea? Did anyone have it lit up during an autocross event?

Anyway, the only real solution is to remove it from the exhaust stream, so it doesn't overheat:
https://www.corvetteforum.com/forums...k-driving.html