DTC P0597-12: Thermostat Heater Control Circuit Short to Battery [11/2021 - 03/2022]: 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.
An electric heater is equipped to the temperature sensing portion of the thermostat. During normal driving, current does not flow to the heater and the thermostat functions as an ordinary thermostat. When the temperature of the engine increases by a large amount such as during high-load driving, control is performed to warm the heater of the temperature sensing portion, forcing the valve to open and causing a large amount of coolant to flow from the radiator.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|
| P0597-12 | Thermostat Heater Control Circuit Short to Battery | Short in thermostat heater circuit and power supply circuit (1 trip detection logic). |
|
Comes on | SAE Code: P0599 |
RELATED DATA LIST
| DTC No. | Data List |
|---|---|
| P0597-12 | Coolant Temperature |