Date: 201904
Local time of day: 1801-2400
Location: ZZZ.TRACON, US
Flight conditions: VMC
Weather elements / visibility: 5
Light: Dusk
Aircraft: B757-200
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Initial Climb
Airspace: Class C ZZZ
ATC / advisory: TRACON ZZZ
Aircraft component: Horizontal Stabilizer Trim
Component problem: Failed
Reporter organization: Air Carrier
Reporter function: Pilot Not Flying; Captain
Reporter qualification: Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Second reporter function: Pilot Flying; First Officer
Anomaly: Aircraft Equipment Problem Critical
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Landed in Emergency Condition; Flight Crew Diverted
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: Shortly after takeoff at approximately 2;000 feet our EICAS warning 'STAB TRIM' illuminated. The first officer was hand flying and stated that the trim would not move but the current trim setting allowed us a safe pitch attitude. He tried to manually move the trim switches and then transferred the controls to me and I tried to manually move the yoke trim switches. The trim would not move from the takeoff setting of 4.9. ATC cleared us to our flight level; 370 and as we were climbing we discussed leveling off at a lower altitude to run the QRH checklist. We leveled off at 17;000 feet. I ran the STAB TRIM QRH checklist and still the trim would not move. I tried to move the stab trim levers and no movement. At this time we turned on the autopilot and discussed our options. At straight and level flight with the autopilot on; the aircraft seemed to hunt for the proper attitude to maintain altitude. The airplane was generally stable; only a slight oscillation experienced. I knew that the message meant that the stab trim was degraded; and saw no movement of the trim out of the takeoff position that was set. After discussing our options; I decided that it would be more prudent to divert to ZZZ1 which was now 87 miles off the nose. I asked for the controls and we discussed using power to adjust the pitch of the airplane. I then handed the QRH to the copilot and asked if he had any suggestions? We both agreed that ZZZ1 would be the best option just in case we would need extra force to keep the nose in a landing attitude. We then [advised] ATC and asked for Runway 36L. We also discussed that if the trim didn't move enough we would both need to hold the yoke. ZZZ1 was our best option because of the facilities. Long runways with crash fire rescue available. All appropriate checklists were complied with; the QRH; the Approach checklist and the landing checklist. ZZZ1 ATC services were extremely helpful; and we as a crew cannot thank them enough for their assistance. We asked for the ILS and set up for a long final. The landing was actually uneventful and did not require much additional control forces. We cleared the runway; asked for a check of the airplane and Crash Fire Rescue followed us to the ramp to ensure a safe arrival into the gateway. Upon arrival the mechanic noted that the STAB TRIM Control module indicated a fault. The airplane was immediately taken out of service.


Second narrative: [Report narrative contained no additional information.]


Synopsis: B757 flight crew reported diverting due to a Stabilizer Trim malfunction.