Challenger 300
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical; Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter CFTT / CFIT
Flight Crew Took Evasive Action
Aircraft
While being vectored for the ILS at ZZZ we received several Terrain Terrain pull up! Commands. We were at 2;500 ft. abeam ZZZ on a right downwind leg the autopilot was engaged at the time of the first warning. The autopilot was disengaged and I began an immediate climb and the Captain notified ZZZ approach of the terrain warning. We climbed to 3;500 ft. to silence the warning. ATC cleared us back down to 2;500 ft. after assuring us that minimum vectoring alt was well below us and there was no terrain to justify a terrain warning between us and the airport. After intercepting the localizer we continued to get the terrain warning The controller also heard the warning when he told us to switch the radio frequency to advisory's. We asked the Controller if we maintained IFR separation and he said that we did maintain it. The approach and landing continued normally.
Challenger 300 flight crew reported terrain warning alert while being vectored for landing.