DTC P162B-87: Lost Communication with Battery Monitor Module Missing Message [10/2022 - ]: Description

WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

The ECM communicates with the battery state sensor assembly via LIN communication. If a LIN communication error is detected, the ECM stores this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate	DTC Output from	Priority	Note
P162B-87	Lost Communication with Battery Monitor Module Missing Message	except Mexico Models: Battery state sensor assembly or ECM communication stops for approximately 60 seconds or more with the ignition switch ON (2 trip detection logic) for Mexico Models: Battery state sensor assembly or ECM communication stops for approximately 17 minutes or more with the ignition switch ON (1 trip detection logic)	Wire harness or connector Battery state sensor assembly ECM	Comes on (For Mexico Models: Does not come on)	Charge warning light does not come on	Engine	A	SAE Code: P162B

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

DTC Output from

Priority

Note

P162B-87

Lost Communication with Battery Monitor Module Missing Message

except Mexico Models:

Battery state sensor assembly or ECM communication stops for approximately 60 seconds or more with the ignition switch ON
(2 trip detection logic)

for Mexico Models:

Battery state sensor assembly or ECM communication stops for approximately 17 minutes or more with the ignition switch ON
(1 trip detection logic)

Wire harness or connector
Battery state sensor assembly
ECM

Comes on (For Mexico Models: Does not come on)

Charge warning light does not come on

Engine

SAE Code: P162B