P0655 Engine Hot Lamp Output Control Circuit Malfunction

The OBD-II trouble code P0655 indicates a malfunction in the engine hot lamp output control circuit in the vehicle.

The engine hot lamp is a warning light on the dashboard that illuminates when the engine temperature exceeds a certain threshold, indicating that the engine is in danger of overheating. The engine hot lamp output control circuit is responsible for controlling the illumination of the engine hot lamp and communicating any fault codes related to the engine overheating to the driver.

A malfunction in the engine hot lamp output control circuit can cause a variety of issues, such as the engine hot lamp not illuminating when the engine is overheating, or the engine hot lamp remaining illuminated even when the engine is not overheating. This can lead to potentially dangerous situations, as the driver may not be aware that the engine is overheating and could potentially cause damage to the engine or other components.

In order to diagnose and repair the issue, a qualified technician will need to use specialized diagnostic equipment to communicate with the vehicle's on-board diagnostics system and identify the root cause of the engine hot lamp output control circuit malfunction. The technician may need to test the wiring and connectors associated with the engine hot lamp output control circuit, as well as perform tests on the engine control module (ECM) itself.

Once the root cause of the issue is identified, the technician may need to repair or replace the wiring and connectors associated with the engine hot lamp output control circuit, or repair or replace the ECM if it is determined that the engine hot lamp output control circuit in the ECM is at fault.

It is important to address these issues promptly, as a malfunctioning engine hot lamp output control circuit can cause damage to the engine or other components, and can also be a potential safety hazard if the driver is not aware that the engine is overheating.