A319
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Total 20000
Situational Awareness
Aircraft Equipment Problem Critical
Flight Crew Diverted; Flight Crew Landed As Precaution; Flight Crew Landed in Emergency Condition
Aircraft; Human Factors
In cruise flight aircraft pitched up and autopilot disconnected. Level off engaged autopilot. Aircraft pitched up again saw trim move rapidly up. Tried autopilot 2 same malfunction. Manual flight still got sudden pitch up .8 units and elevator override. Declared an emergency notified company and advised flight attendants and PAX (Passengers) of divert to ABQ. Pitching stopped when ELAC (Elevator Aileron Computer)  1 & 2 pitch faulted. Made a precautionary overweight landing ABQ braking anti-skid failed during roll out. Emergency personnel saw no fluids leaking; deemed safe to proceed to gate. Stab trim malfunction.
While at FL370; we initially experienced the aircraft slightly pitch up followed by the autopilot disconnecting. The next 20 or so times this occurred; the pitch trim wheel spun back; in a trim up direction varying from .2 to .8 units followed by the autopilot disconnecting. We tried both autopilot 1 and 2. After a few attempts with the autopilot engaged; this continued to occur. We then kept it disconnected and manually flew the rest of the flight to a landing in ZZZ. The event only stopped occurring once we got the ECAM (Electronic Centralized Aircraft Monitor) message ELAC (Elevator Aileron Computer) 1 PITCH FAULT; and ELAC 2 PITCH FAULT. This put the aircraft into Alternate Law. We made the decision to divert to ZZZ once this kept happening while the autopilot was disconnected. We followed through with all ECAM actions and landed in ZZZ. My only understanding from conversations with my CA (Captain) and [Maintenance Control] was a BIT (Built in Test) malfunction in one or both ELACs trying to control the auto-trim. Computer code written in the flight control computers which provide fault information and disengage before trying to control the aircraft in a faulty way.
A319 flight crew reported a stabilizer trim malfunction.