DTC B1503-09: Exhaust Heat Management Component Failure [10/2022 - ]: Description
WARNING: This page is about a different car, the 2025 Toyota Highlander, 2024 Toyota Highlander, and 2023 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
This DTC is stored and an engine coolant temperature warning is displayed when the combination meter assembly detects a malfunction in the temperature switch that is connected to the combination meter assembly via direct line.
HINT:
When this DTC is stored, the engine coolant temperature receiver gauge in the combination meter assembly indicates an engine coolant temperature of 125°C (257°F).
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1503-09 | Exhaust Heat Management Component Failure | Diagnosis Condition:
Malfunction Status:
Malfunction Time:
|
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