P0654 Fault Code

Engine RPM Output Circuit Malfunction

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

The P0654 fault code indicates an issue with the Engine RPM Output Circuit. This code is generated when the Engine Control Module (ECM) detects that the signal from the engine RPM sensor is not functioning correctly. The RPM output is crucial for various engine management functions, including ignition timing and fuel injection, so any malfunction can lead to poor engine performance.

What are the symptoms of the P0654 code?

Symptoms often associated with the P0654 code may include:

• The engine may not start at all or has difficulty starting.
• Erratic engine performance, including stalling or misfiring.
• Illumination of the Check Engine light on the dashboard.
• Inaccurate RPM readings on the vehicle's RPM gauge, if available.

What causes the P0654 code?

Common causes of the P0654 fault code can include:

• A faulty engine RPM sensor that may be sending erratic or no signals.
• Wiring issues such as damaged or corroded connectors in the RPM sensor circuit.
• A malfunctioning Engine Control Module (ECM) that fails to interpret the signal correctly.
• Poor grounding connections affecting the sensor's performance.

How to fix P0654?

To resolve the P0654 fault code, consider the following steps:

1. Inspect the engine RPM sensor and its wiring for any visible damage or loose connections.
2. Test the engine RPM sensor for proper operation and replace it if faulty.
3. Check the ground connections and wiring integrity to ensure there is no short or open circuit.
4. Scan the vehicle with an OBD-II scanner to clear the code and conduct a road test to see if the code reappears.