I am new here, but I came across the 5070 code recently and I do think it's related to the throttle pedal sensor.
My 2007 1.6 TCDi Focus was code free until yesterday - when I removed the throttle to replace my cabin air filter [LHD car]. Before plugging the throttle again, I turned the key and I got a system failure message. After re-assembling the throttle and bolting it back the car started normally.
I checked the codes from the dash, and instead of none I saw DTC #1 5070. I plugged in my Bluetooth OBDII anc checked the codes on mu phone and the was the P0222 'throttle/pedal position/switch "B" circuit low input' code!
I cleared it, and the dash code cleared too.
My conclusion from this is that the DTC 5070 is actually related to the throttle pedal.