This is long but good reading. Volvos use 5V pedal sensors, so the variable wire will go from .01V to 5V at full throttle.
https://www.obd-codes.com/p2135
My guess is the ETM is broken or the connector to it is bad. Why do companies use plastic gearing? Don't they know that plastic gets brittle with age and excessive heat will cause extra wear on plastic gears?
If Mary wants, I have a good running 855T she can borrow. It will leak a quarter size spot of oil from the RMS every time it is parked. The seat heaters work!
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Keeping it running is better than buying new
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