Code U0157 on the 2020 Infiniti QX60 indicates lost communication with the compass module. This module processes magnetic heading data used by the dashboard compass display and navigation system for direction orientation.
Vehicle Compass System
The compass module contains a magnetometer that detects Earth's magnetic field to determine vehicle heading. This data feeds the compass display (N, S, E, W) in the instrument cluster and helps the navigation system maintain orientation between GPS updates. Communication loss affects these direction-finding features.
Navigation Effects
With U0157 present, the compass display may show incorrect headings, no heading, or an error symbol. Navigation may be less accurate during GPS signal loss since it can't use compass data for dead reckoning. The map display may not rotate correctly with vehicle direction.
Diagnostic Focus
The compass module is typically mounted in the rearview mirror assembly or dashboard area away from magnetic interference. Check the module connector for damage. Verify power and ground. Test CAN communication at the module. Aftermarket accessories with strong magnets (phone mounts, etc.) near the module can affect accuracy but shouldn't cause communication loss.
Repair Path
Address connector and wiring issues first. If the compass module has failed, replacement location affects the complexity. Mirror-mounted units require mirror disassembly. After installation, compass calibration (driving in circles) may be required for accurate readings.