DTC P0654 points to a malfunction in the Engine RPM Output Circuit. This code is indicative of an issue with the control circuit responsible for relaying engine RPM information to various control modules within the vehicle.

1. What does P0654 code mean?

DTC P0654 indicates that there’s a malfunction within the control circuit responsible for providing engine RPM information to the vehicle’s various control modules, such as the Engine Control Module (ECM) or Powertrain Control Module (PCM).

2. What are the causes of DTC P0654?

Possible causes for DTC P0654 include:

• Faulty RPM Sensor: A malfunctioning or damaged RPM sensor can lead to inaccurate RPM readings, triggering this error code.
• Wiring Issues: Corrosion, damage, or disconnection within the wiring or connectors associated with the RPM sensor or output circuit can lead to this error.
• Faulty ECM/PCM: An issue with the ECM/PCM responsible for receiving and processing RPM data might also trigger this error code.

3. What are the symptoms of DTC P0654?

Symptoms related to DTC P0654 may include:

• Check Engine Light: The illumination of the Check Engine Light is a common symptom associated with this code.
• Rough Engine Operation: Inaccurate or erratic RPM readings may lead to rough engine operation or performance issues.
• Reduced Power: The vehicle might experience reduced power or performance due to incorrect RPM data.

4. How to diagnose DTC P0654?

Diagnosing DTC P0654 involves several steps:

• Code Scan: Use an OBD-II scanner to retrieve the trouble codes and relevant data stored in the ECM/PCM.
• Visual Inspection: Inspect the RPM sensor, wiring, and connectors for any visible damage, corrosion, or loose connections.
• Wiring and Sensor Checks: Perform voltage and continuity checks on the RPM sensor and associated wiring using a multimeter.
• ECM/PCM Testing: Test the ECM/PCM functionality and its ability to receive and interpret RPM data.

5. How to fix DTC P0654 problem?

Potential steps to resolve DTC P0654 may include:

• Repair or Replace Wiring: Address any damaged or faulty wiring, connectors, or terminals associated with the RPM sensor or output circuit.
• Replace RPM Sensor: If the RPM sensor is defective, consider repairing or replacing it.
• ECM/PCM Replacement: In rare cases, a malfunctioning ECM/PCM may require replacement.
• Clear Error Codes: After repairs, clear the error codes using an OBD-II scanner to reset the system and check if the issue persists.

Conclusion

DTC P0654 indicates a malfunction within the Engine RPM Output Circuit, affecting the accurate transmission of engine RPM data to various control modules. Timely diagnosis and resolution of the underlying issues are crucial to ensure proper engine performance and functionality.