The gearbox ECU has flagged an electrical fault on shift solenoid A — open circuit, short, or resistance out of spec on the control side. This is the electrical sibling of P0750, which flags mechanical / performance issues.
Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email bob@bobsmechanicalrepairs.co.uk.