The P0654 trouble code indicates a malfunction in the engine RPM output circuit. This circuit is responsible for providing the Engine Control Module (ECM) or Powertrain Control Module (PCM) with data regarding the engine’s RPM (revolutions per minute). If the ECM or PCM detects a fault or inconsistency in this circuit, it will trigger this trouble code.
P0654 Engine RPM Output Circuit Malfunction
Code symptoms P0654.
1. Illumination of the Check Engine Light (CEL).
2. Engine performance issues, such as rough idling, hesitation, or stalling.
3. Incorrect or erratic RPM readings on the tachometer.
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 P0654.
1. Faulty engine RPM sensor.
2. Open or short circuit in the engine RPM output circuit.
3. Corrosion or damage to wiring or connectors in the circuit.
4. Faulty ECM or PCM.
Code Solutions P0654.
1. Inspect the wiring and connectors in the engine RPM output circuit for any signs of damage, corrosion, or loose connections. Repair or replace damaged components as necessary.
2. Check the engine RPM sensor 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 RPM sensor, 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 RPM output circuit. If needed, seek assistance from a qualified technician or dealership.