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The code happens when the TCU loses connection to the ECU during flashing. It's normal and does not indicate any issues. Doesn't happen even time, either. I've flashed in the neighborhood of 50 tunes and have only seen it a few times.
Powerband changes can result in "abrupt" shifts where wheel torque no longer matches what the ECU expects it to be. Seems to only affect low RPM low acceleration upshifts, and nobody has solved this yet.
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2013 Whiteout 6AT FR-S | Perrin Inlet Tube + 2.75" CAI | OpenFlash Header | P&L Catback | 4.88 Final Drive | Dialed in OFT 2.0x Stage 2 E85 | 18x8 Enkei Raijin + 225/40 Michelin Pilot Super Sport | 17x7 Stock + 215/45 Michelin X-Ice Xi-2
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