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I am struggling to believe you aren't getting any codes or blink codes. How are you trying to retrieve error codes from the system?
You can slap one together for ~$1000 and a few hours work, but you'll notably only get channel voltages, not module voltages. 1) GitHub...
To rephrase: your original problem description, that the transmission appears to be slipping, and allowing higher revs and lower...
You're going about this the wrong way. The car will decide to reduce acceleration and increase the engine RPM when it decides the hybrid...