P2553 Fault Code

Throttle/Fuel Inhibit Circuit Range/Performance

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

The P2553 fault code indicates an issue with the Throttle/Fuel Inhibit Circuit's range or performance. This code is triggered when the engine control module (ECM) detects that the throttle control system is not functioning within the specified parameters. As a result, the vehicle may experience reduced power or efficiency in throttle response due to potential issues in various components interacting with the fuel system.

What are the symptoms of the P2553 code?

When the P2553 code is present, drivers may notice the following symptoms:

• Decreased engine power or acceleration.
• Unstable or erratic engine idle.
• The check engine light (CEL) illuminated on the dashboard.
• Reduced fuel efficiency.
• Possible engine stalling or hesitation during acceleration.

What causes the P2553 code?

Common causes for the P2553 fault code include:

• Faulty throttle position sensor (TPS) that provides incorrect voltage signals.
• Damaged or corroded wiring in the throttle/fuel inhibit circuit.
• Malfunctioning electronic control unit (ECU) that fails to process throttle data correctly.
• Defective fuel injectors or fuel pump affecting fuel delivery.
• Vacuum leaks that impact engine performance and throttle response.

How to fix P2553?

To resolve the P2553 fault code, technicians typically follow these steps:

• Inspect the throttle position sensor and test its voltage output for accuracy.
• Check the wiring and connectors for any signs of damage or corrosion.
• Examine the electronic control unit (ECU) for fault codes or updates required.
• Test the fuel delivery system, including the fuel pump and injectors, for proper functionality.
• Clear the fault code and take the vehicle for a test drive to see if the issue reoccurs.