P0655 Fault Code

Engine Hot Lamp Output Control Circuit Malfunction

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0655 fault code indicates a malfunction in the Engine Hot Lamp Output Control Circuit, which is responsible for signaling when the engine temperature is too high. This process involves various components, including sensors and the engine control unit (ECU). Proper functioning of this circuit is crucial for preventing overheating and potential engine damage.

What are the symptoms of the P0655 code?

Symptoms of the P0655 code may include:

• Illuminated check engine light (CEL).
• Engine overheating warnings.
• Possible engine performance issues due to incorrect temperature readings.
• In some cases, the vehicle may enter limp mode to prevent further damage.

What causes the P0655 code?

Common causes for the P0655 fault code include:

• Faulty engine coolant temperature (ECT) sensor.
• Short or open circuits within the wiring associated with the hot lamp output control.
• Defective engine control module (ECM) or software issues.
• Poor connections or corroded terminals in the circuit.

How to fix P0655?

To resolve the P0655 fault code, consider the following steps:

1. Inspect all wiring and connections associated with the engine hot lamp output circuit for damage or corrosion.
2. Test the engine coolant temperature sensor for proper functionality and replace if necessary.
3. Check the ECM for any software updates or faults.
4. Clear the fault code and run the engine to see if the issue recurs, monitoring for any temperature-related warnings.