Your vehicle's battery module is sending a voltage signal that's too high or too low, like a thermostat reading that's wildly off. The onboard computer can't trust the battery's health status and triggers this warning.

The ECU monitors the battery module voltage through a dedicated sensor circuit to verify battery health and charging system operation. When voltage deviates significantly from the nominal range, the ECU registers a fault to prevent damage to sensitive electronics or prevent starting issues.

Voltage & Parameter Thresholds