Part of Mont Les Vaux in St Brelade is due to stay closed until the end of next week because a hole has opened up in the road.
The stretch near St Aubin on the Hill Church was shut yesterday (16 June).
The government says the road and drainage need extensive repairs.
The government says the issue wasn't apparent during the recent resurfacing work.
Officials have apologised and thanked islanders for their patience.

Channel Islander abandons Bordeaux as the flames 'arrive at the city's gates'
Man in hospital after serious assault at Havre Des Pas festival
Jersey teen taking on 'Journey of Hope'
No increase in domestic abuse reports in Jersey during World Cup
Nowacki wins Jersey’s first Commonwealth Games medal in 36 years
Commonwealth Games: Nowacki into 100m breaststroke final
Thousands expected at Havre Des Pas Festival this weekend
Channel Islands face 'physical' Poland test