DTC P058A-01: Battery Monitor Module General Electrical Failure [03/2023 - ]: Description

WARNING: This page is about a different car, the 2025 Lexus NX 250, 2024 Lexus NX 250, 2023 Lexus NX 250, and 2022 Lexus NX 250. However, it is still accessible from the selected car via links, so may be relevant.

The battery state sensor assembly detects the voltage, current and temperature of the battery. The battery state sensor assembly calculates State of Charge (SOC) based on the voltage and current of the battery and sends it to the ECM. Based on the signals received, the ECM adjusts the charging voltage of the generator assembly.

The battery state sensor assembly calculates the battery temperature based on changes in resistance of a built-in thermistor and sends it to the ECM. The ECM reduces the amount of charging current based on this signal in order to protect the battery.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate	Note
P058A-01	Battery Monitor Module General Electrical Failure	Any of the following conditions is met with the ignition switch ON. (1 trip detection logic): Current is 999.939 A or more, or -1000 A or less for 3.2 seconds or more. A current detection circuit malfunction signal is received. The battery temperature is 105°C or more or -40°C or less for 12.288 seconds or more. A temperature detection circuit malfunction signal is received. Voltage is 15.98 V or more, or 6.0 V or less for 3.2 seconds or more. A voltage detection circuit malfunction signal is received. A writing error occurs in the battery state sensor internal memory (battery identification data).	Battery state sensor assembly Battery Wire harness or connector	Does not come on	Charge warning light does not come on	SAE Code: P058A