The P0514 code on your 2019 GMC Sierra indicates a malfunction in the battery temperature sensor circuit. This sensor helps the charging system optimize charging based on battery temperature.
Battery Temperature Sensor Purpose
The battery temperature sensor allows the ECM and charging system to adjust charging voltage based on temperature. Cold batteries need higher voltage to charge properly, while hot batteries need lower voltage to prevent damage. Accurate temperature data optimizes battery life and charging efficiency.
Sierra Charging System
The 2019 Sierra uses sophisticated charging management that adjusts alternator output based on battery state of charge and temperature. The temperature sensor, often built into the battery or mounted nearby, provides crucial data for this system.
Sensor Malfunction Causes
The temperature sensor may have failed. Wiring between the sensor and ECM may be damaged. Connector corrosion affects signal quality. The sensor may be improperly installed or positioned. In some cases, a replaced battery may not have the integrated sensor.
Diagnostic Steps
Use GM GDS2 to read battery temperature values. Compare sensor reading to actual battery temperature. Check sensor location and condition—some are integrated into the battery, others are separate. Test wiring continuity to the ECM. Verify the sensor is compatible with the vehicle if the battery was replaced.