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Firmware 7.1

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What makes you think it's a bug in the firmware? I've never seen that message.

More likely to be a loose wiring harness.
My local service centre told me so: there are known bugs in v2.16.17 that cause TC/SC/AEB/AP/regen to be randomly disabled; multiple owners have reported the exact same problem in Australia; this version has been pulled for any car that hasn't already updated; they're working on a fix; the newer versions (e.g. 2.17.37) fixes some but not all of these bugs.
 
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My local service centre told me so: there are known bugs in v2.16.17 that cause TC/SC/AEB/AP/regen to be randomly disabled; multiple owners have reported the exact same problem in Australia; this version has been pulled for any car that hasn't already updated; they're working on a fix; the newer versions (e.g. 2.17.37) fixes some but not all of these bugs.

I noticed SC being disabled even in version prior to 2.6.17.
 
Any P90D owners see reduced power after 2.17.37? I could only manage 408kW tonight. I turned on the data logger after I noticed the power under acceleration would barely get to the "4" in 400, and not well past it. I'll try again tomorrow but it's not looking good.

edit - at 90% charge as well.

Nope, did a full launch mode with Max battery at around 90% SOC and it was a bat out of hell. Didn't log it, but felt every bit of sub 3" that I've always felt.