DTC P058A-01: Auxiliary Battery Monitor Module Range/Performance [10/2018 - ]: Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus UX 250h, 2023 Lexus UX 250h, 2022 Lexus UX 250h, 2021 Lexus UX 250h, and 2020 Lexus UX 250h. However, it is still accessible from the selected car via links, so may be relevant.

The battery state sensor assembly detects the auxiliary voltage, current and temperature of the auxiliary battery. The battery state sensor assembly calculates State of Charge (SOC) based on the voltage and current of the auxiliary battery and sends it to the hybrid vehicle control ECU. Based on the signals received, the hybrid vehicle control ECU adjusts the charging voltage of the DC/DC converter.

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Memory	Note
P058A-01	Auxiliary Battery Monitor Module Range/Performance	Any of the following conditions is met with the power switch on (IG). (1 trip detection logic): Current is 999.939 A or more, or -1000 A or less for 3.2 seconds or more. The difference between the maximum and minimum current is 0.0305 A or less for 100 seconds or more. A current detection circuit malfunction signal is received. The auxiliary battery temperature is 105°C (221°F) or more or -40°C (-40°F) or less for 3.2 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 auxiliary battery state sensor internal memory (battery identification data).	Battery state sensor assembly Auxiliary battery Wire harness or connector	Charge warning light does not come on	DTC stored	SAE Code: P058A

DTC DETECTION CONDITIONS

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3	Pattern 4	Pattern 5	Pattern 6
Diagnosis Condition	Power switch on (IG)	◦	◦	◦	◦	◦	◦
Malfunction Status	Current value is 999.939 A or more	◦	-	-	-	-	-
	Current value is -1000 A or less	-	◦	-	-	-	-
	Difference between maximum and minimum current value is 0.0305 A or less	-	-	◦	-	-	-
	Current detection circuit malfunction condition is received	-	-	-	◦	-	-
	Auxiliary battery temperature is 105°C or more	-	-	-	-	◦	-
	Auxiliary battery temperature is -40°C or less	-	-	-	-	-	◦
Detection Time		3.2 seconds or more	3.2 seconds or more	100 seconds or more	-	3.2 seconds or more	3.2 seconds or more
Number of Trips		1 trip	1 trip	1 trip	1 trip	1 trip	1 trip

DTC DETECTION CONDITIONS

		Vehicle Condition
		Pattern 7	Pattern 8	Pattern 9	Pattern 10	Pattern 11
Diagnosis Condition	Power switch on (IG)	◦	◦	◦	◦	◦
Malfunction Status	Temperature detection circuit malfunction signal is received	◦	-	-	-	-
	Voltage value remains at 15.98 V or more	-	◦	-	-	-
	Voltage value remains at 6.0 V or less	-	-	◦	-	-
	Voltage detection circuit malfunction signal is received	-	-	-	◦	-
	Battery state sensor assembly internal memory write malfunction (battery identification information) occurs	-	-	-	-	◦
Detection Time		-	3.2 seconds or more	3.2 seconds or more	-	-
Number of Trips		1 trip	1 trip	1 trip	1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.