[Tcoat]

Originally Posted by arvidj

Technical Bulletin S-SB-0021-15, issued September 17, 2015, Idle Fluctuation in Park or Neutral.

Applicability: 2015-2016 FR-S

Introduction: Some 2015-2016 model year FR-S vehicles may exhibit a condition where the engine idle speed fluctuates (typically 500 - 1000 RPM) only when the transmission is in the Park or Neutral shift position. This condition occurs after the vehicle has been driven about 25 miles or more at highway speeds. The Transmission Control Module (TCM) logic has been revised to address this condition.

I had the TCM software upgraded yesterday ... about an hour at the dealer total time ... and the idle is now rock solid.

Originally Posted by Sigh-on-Rice

Yes, on the TSB that was just posted on the TSB thread, it specifically list "A/T" as drivetrain.

Originally Posted by GotBRZ1691

So i noticed that my BRZ has just started doing this. I started the car in the drive and let it come up to temp. Once the rpms dropped to idle, i noticed it was idle hunting continuously, from 600rpm to 900rpm. Additionally, I hear a rattle when apply slight throttle to bring the car up 200/300 rpms, from 600rpm.

Is this rattle potentially because the car wants to stall? Or should I get it looked at.

Im going to post a video this afternoon as I think my engine is more clicky and rattley, but that may just been paranoia getting to me.

Current mods include K&N intake, Perrin Cat back, Perrin LWCP, Stock tune.

Take it in.