Fault code: P3400
Thread Starter
Drifting
Joined: Apr 2013
Posts: 1,743
Likes: 453
From: Saint Clair Shores Mi
Fault code: P3400
Just got a steady CEL while driving back to the office from lunch. Called OnStar, they said it was P3400 - AFM fault. I looked it up and it could be one of several things. I called my dealer (who by the way is really good) and he can't get it in till sometime next week. He said it won't go into 4cyl mode, but is OK to drive till I can get it in. I'm fine with this, as I was thinking of getting a range anyhow LOL, but I do know I should get it fixed.
Anyone have any experience with P3400 fault and what the outcome was? By the way, this is the VERY FIRST problem of any kind I've had with the car - 34K on the clock - 2015 A8.
Thanks in advance - Tom
Anyone have any experience with P3400 fault and what the outcome was? By the way, this is the VERY FIRST problem of any kind I've had with the car - 34K on the clock - 2015 A8.
Thanks in advance - Tom
Le Mans Master
Joined: Jan 2006
Posts: 6,800
Likes: 2,653
From: Down south in Dixie
I haven't seen any post with that problem either Tom. Heck, I paid right at a 100 bucks for my Range, and you got the V4 disabled for free. 
Just kidding, Hopefully someone will know more about this code than I. Good luck.
Jim
Just kidding, Hopefully someone will know more about this code than I. Good luck.Jim
Last edited by Rebel Yell; Jul 24, 2018 at 03:04 PM.
Drifting
Joined: Oct 2014
Posts: 1,733
Likes: 403
From: Atlanta, GA
Coulda been a rogue electron took a wrong turn. I had a bizarre code a couple weeks back with a CEL. All kinds of systems were off line or partial. Dealer was able to reset it and haven't seen it since.
Hopefully a simple fix brother.
Hopefully a simple fix brother.
Thread Starter
Drifting
Joined: Apr 2013
Posts: 1,743
Likes: 453
From: Saint Clair Shores Mi
Thanks again - tom
