Could possibly be an ETM fault,mine went like this recently and was due in to Volvo 2 days later for the ETM clean.This was done but also needed a new Throttle pedal as this was faulty apparently,£160 for the pedal and £20 at my mechanic to have the codes read.
Do a search on here for ETM as there are a number of threads running and a list of affected cars.
Ben.
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