2011 Subaru Forester P0741

That capture was taken the moment the CEL tripped. I have a recurring p0741 that I already shotgunned a valve body into and this capture is the first time I've ever been able to recreate it. Power side switched solenoid, case grounded, and I'm backprobed on the power side, at the TCM.

Am I looking at driver failure or driver shutdown? Referring to the burp at the end and then flatlined

I'm not all that familiar with Suby transmissions, but it sure looks like the TCM is doing everything it can to get the TCC to engage. :lol: I'm guessing it's watching engine speed, input and output speeds (like most other TCC setups), decided the TCC wasn't engaging, gave up trying and set the code. I think that's why the waveform flatlines at the end of your screenshot.

Is there a TCC slip data PID to observe while test driving? That'd give a clue to how well the TCC is working, if at all.

It also appears that the TCC driver is working as it should. Measuring the solenoids current draw compared to the solenoid resistance specification would go a long way towards proving out a wiring problem. Do you have access to service info? Knowing the exact code set criteria would also help to determine if this is a true circuit issue, or a performance issue.

If the TCC circuit is good, and the fluid level is full, then I think it's time for a new torque converter or trans assembly.