I'm not sure how a gearbox fault makes the car accelerate (as in opens the throttle unexpectedly) I'd be looking at the pedal box - and the throttle position sensor (it's diesel isn't it?).
Had the car from new? Gearbox fluid should have been changed back in 2009 and again in 2015 - interval is 6 years/ 60,000 miles whichever comes first: I'm not surprised if it smells.
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My pal plugged her in and got gearbox fault reading.
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Unless he cleared the fault and it re-occurred after the fault happened again it doesn't mean anything. Add to that the 2003 CDT isn't 100% OBD compliant, so unless it was a T4 he plugged it into... Add to that there's a list of things that come up as faults on these cars
that are normal and only experienced operators can tell you which. I'd take that fault reading with a pinch of salt. Still, change that transmission fluid!
My money is on throttle position sensor or catching the throttle pedal with foot when braking.