P2257 Fault Code

Secondary Air Injection System Control A Circuit Low

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

The P2257 fault code refers to an issue with the Secondary Air Injection System Control A Circuit, indicating that the circuit voltage is lower than expected. This system is designed to reduce emissions by injecting air into the exhaust stream during cold starts, helping to burn off unburned fuel and decrease pollutants.

What are the symptoms of the P2257 code?

When this fault code is present, drivers may experience:

• Illuminated check engine light
• Increased emissions, potentially leading to failed emissions testing
• Rough idling or poor engine performance under certain conditions
• A noticeable increase in fuel consumption, particularly if the system is inoperable

What causes the P2257 code?

A variety of issues can trigger this fault code, including:

• Faulty secondary air injection pump
• Damaged wiring or connectors in the control circuit
• Failed relay or fuse associated with the air injection system
• Malfunctioning control module or sensors

How to fix P2257?

To resolve the P2257 fault code, follow these troubleshooting steps:

1. Inspect the wiring and connectors associated with the secondary air injection system for any damage or corrosion.
2. Check the secondary air injection pump to ensure it is functioning correctly; replace if necessary.
3. Test the related relay and fuses; ensure they are operational and replace any that are blown.
4. Use a scan tool to check for additional trouble codes which may indicate related issues and perform necessary repairs accordingly.