3.0 M54 with GM Transmission.

Got the "Trans Fail Safe Prog" across the bottom of the cluster + yellow brake light today after only driving 5 mins. Car felt like it had loss of power for split second a couple of times (not a trans slip) and changed up and down through the gears fine otherwise.
Error message still up when reached destination, turned ignition off and on again-error message had cleared.

Scanned for codes when I got home- TCM code "97 CAN status, fault" ?
Scanned all other modules on the CAN circuit (DME, DSC, Cluster etc) no other codes.

Voltage fine with ignition off and on (12.4v & 13.9v)

Took it for a drive and monitored a few things with the scanner- Brake switch activation OK. All trans activations working as they should, All speeds sensors reading correct etc.

Cleared code. Took it for a drive up around a Mountain pass to load it up, trans ran and shifted flawlessly.
No warnings or codes since.

I replaced the trans fluid when I first got the car about a year ago- 3x drain and fill with Valvoline Maxlife ATF, new bmw filter.
Never any issues before today.


Anyone experienced anything similar? Any ideas what might have caused that one off situation?

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2003 E53 3.0
2001 E46 330ci Msport
2001 E46 325i Touring wagon