We have not seen reports of this issue previously, so it therefore may be a less common fault, but the fact that it can cause a loss of control or inconsistent behaviour means it should be treated seriously by the dealer. It is likely that the issue relates to the engagement of reverse, so it could be that an actuator or solenoid is faulty or failing, which would account for the fault occurring intermittently and also not necessarily in the same manner. We would hope that on this occasion the dealer will be able to uncover the fault, but if not you may need to leave the vehicle with the dealer for an extended period of time so that they can drive it various conditions with a diagnostic tool connected so they can view live data from the vehicle. If you can narrow down the circumstances when the fault occurs, such as when the vehicle is hot or cold, at the start or at the end of journeys, this may help the dealer replicate the conditions that cause it to happen.

If this is still unsuccessful then we would suggest contacting Hyundai UK to escalate the issue. It may be that a senior technician is required to uncover the fault, but we would continue to press for a solution as this is a fault that could potentially cause an accident.