Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Last 90 Days 60
Confusion; Troubleshooting
Aircraft Equipment Problem Less Severe
Flight Crew Overcame Equipment Problem; Flight Crew Executed Go Around / Missed Approach
Aircraft
On short final into ZZZ Runway XXL; we received a GPWS 'Too Low Terrain' warning. We were on glideslope and on PAPI (VMC conditions). We executed a go-around and as we leveled off we received several error messages in the scratch pad [including] 'GPS L incorrect' and a 'Runway/Approach CRS ERROR'. The Captain was flying and could not get NAV data to display on his PFD (Primary Flight Display). He also was unable to tune the ILS frequency for the subsequent approach. We consulted the checklist; then transferred the controls to the First Officer whose displays and NAV data appeared to be reading correctly and hand flew an approach in VFR conditions to a landing without incident. There was a lot of confusion with multiple errors occurring in the cockpit. The GPWS that sounded while we were on the glideslope during short final seemed to be erroneous; but then again with all the errors with the NAV data on the Pilot Flying side; maybe his glideslope was incorrect. In the end; going around and troubleshooting put time on our side and allowed us to determine the best course of action.
A B737 pilot reported several erroneous warnings and display errors on the Captain's side; who was Pilot Flying; during short final. A successful go-around and landing was performed by the First Officer.