P0655 – OBD-II DTC

OBD-II DTC P0655 – Engine RPM Output Circuit Malfunction

DTC P0655 meaning

DTC P0655 refers to a malfunction in the Engine RPM Output Circuit. This diagnostic trouble code indicates that the Engine Control Module (ECM) has detected an issue with the signal that communicates the engine’s RPM to other systems in the vehicle. The RPM output is crucial for various functions, including engine performance, fuel efficiency, and emissions control.

DTC P0655 symptoms

Common symptoms associated with DTC P0655 may include:

• Check Engine Light illuminated
• Erratic or unstable engine RPM readings
• Reduced engine performance
• Increased fuel consumption
• Difficulty in starting the engine

DTC P0655 causes

Several factors can lead to the triggering of DTC P0655, including:

• Faulty Engine Control Module (ECM)
• Damaged or corroded wiring in the RPM output circuit
• Defective RPM sensor
• Poor electrical connections
• Issues with related components, such as the ignition system

DTC P0655 seriousness

DTC P0655 can be considered serious as it affects the engine’s ability to operate efficiently. If left unaddressed, it may lead to:

• Increased emissions
• Potential engine damage due to improper fuel mixture
• Decreased vehicle performance

How to diagnose DTC P0655

To diagnose DTC P0655, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the code.
2. Check for any additional trouble codes that may provide more context.
3. Inspect the wiring and connectors related to the RPM output circuit for damage or corrosion.
4. Test the RPM sensor for proper operation.
5. Examine the ECM for any signs of malfunction.

How to fix DTC P0655 step-by-step instructions

To fix DTC P0655, follow these step-by-step instructions:

1. Clear the DTC using an OBD-II scanner.
2. Inspect and repair any damaged wiring or connectors in the RPM output circuit.
3. Replace the RPM sensor if it is found to be faulty.
4. Check and repair any issues with the ECM if necessary.
5. Re-scan the vehicle to ensure the code does not return.

How to erase DTC P0655

To erase DTC P0655, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn the ignition key to the “On” position without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the engine to check if the code reappears.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.