DTC P0615-12: Starter Relay Circuit Short to Battery [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.

While the engine is being cranked, battery voltage is applied to terminal STA of the ECM.

If the ECM detects the starter control (STA) signal while the vehicle is being driven, it determines that there is a malfunction in the STA circuit. The ECM then illuminates the MIL and stores this DTC.

This monitor runs when the vehicle is driven at 20 km/h (12 mph) or more for 20 seconds or more.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P0615-12	Starter Relay Circuit Short to Battery	All of the following conditions are met (1-trip detection logic): The battery voltage is 10.5 V or more. The vehicle speed is 20 km/h (12 mph) or more. The engine speed is more than 1000 rpm. The starter signal is ON for 20 seconds or more.	Harness and connector Engine stop and start ECU Certification ECU (Smart key ECU assembly) ECM Starter relay circuit	Comes on	Transmission	A	SAE Code: P0617