Engine RPM Output Circuit Low

Common symptoms

What you'll notice

• Check the wiring and connections for any loose or damaged wires
• Inspect the RPM sensor for any malfunctions or damage, and replace if necessary
• Verify the power supply to the RPM sensor and ensure it is within the specified range
• If all else fails, consider replacing the Engine Control Module (ECM) as a last resort option

Common causes

Most likely first

1. Faulty engine RPM sensor
2. Loose or damaged wiring connected to the engine RPM sensor
3. Faulty engine control module (ECM)
4. Low battery voltage affecting the engine RPM sensor
5. Engine misfire or mechanical issue causing a low RPM output

How to diagnose & fix

Work through it in order

1. Loss of engine power
2. Misfiring or hesitation during acceleration
3. Engine stalling or rough idle
4. Difficulty starting the vehicle
5. Illuminated check engine light