The P0655 trouble code indicates a malfunction in the engine hot lamp output control circuit. This circuit is responsible for controlling the engine hot lamp, which alerts the driver when the engine temperature exceeds safe operating levels. If the Engine Control Module (ECM) or Powertrain Control Module (PCM) detects a fault in this circuit, it will trigger this trouble code.
P0655 Engine Hot Lamp Output Control Circuit Malfunction
Code symptoms P0655.
1. Illumination of the Check Engine Light (CEL).
2. Engine temperature warning lamp may illuminate incorrectly or not illuminate at all.
3. Engine temperature gauge may malfunction or read incorrectly.
4. Other related trouble codes may be present.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0655.
1. Faulty engine hot lamp.
2. Open or short circuit in the engine hot lamp output control circuit.
3. Corrosion or damage to wiring or connectors in the circuit.
4. Faulty ECM or PCM.
Code Solutions P0655.
1. Inspect the wiring and connectors in the engine hot lamp output control circuit for any signs of damage, corrosion, or loose connections. Repair or replace damaged components as necessary.
2. Check the engine hot lamp for proper operation. Test its resistance and signal output using a multimeter according to manufacturer specifications.
3. Clear the trouble codes and perform a test drive to verify if the issue persists. If the code returns, further diagnosis may be required.
4. If no issues are found with the wiring, connectors, or engine hot lamp, the ECM or PCM may be faulty and require replacement.
5. Follow manufacturer-specific diagnostic procedures outlined in the vehicle’s service manual to accurately diagnose and repair issues related to the engine hot lamp output control circuit. If needed, seek assistance from a qualified technician or dealership.