A319
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Distraction
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Gate; General Maintenance Action; General Flight Cancelled / Delayed
Aircraft
On taxi-out; experienced a smoke/odor/fume event.  Returned to gate. Causal factors unknown.
[Report narrative contained no additional information].
A319 flight crew reported a fumes event of unknown cause during taxi-out and executed a return to gate.