Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 150; Flight Crew Type 11000
Confusion
Aircraft Equipment Problem Less Severe; Deviation - Altitude Excursion From Assigned Altitude
Flight Crew Overcame Equipment Problem
Environment - Non Weather Related; Aircraft
[There was] possible 5G interference. [I was] flying a visual approach backed up with the RNAV RNP Runway 16L; between WORTH and URATE; fully configured for landing. LNAV and VNAV were both engaged and performing normally. Then just before URATE; VNAV suddenly showed us below the PATH; although the Flight Mode Annunciator was showing VNAV PATH. The auto throttles added thrust and we could visually see that VNAV was getting the aircraft high on the PAPI. I disconnected the autopilot and auto throttles and hand flew the aircraft using V/S mode and the heads-up display. I didn't notice any abnormal Radio Altimeter indications.
Air Carrier Pilot reported on approach the VNAV indicated the aircraft was below the flight path while the FMA indicated on path. Pilot stated this could have been caused by possible 5G interference.