P2259 Fault Code

Secondary Air Injection System Control B Circuit Low

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

The P2259 fault code indicates a problem with the Secondary Air Injection System Control B Circuit, specifically pointing to a low voltage or signal issue. This system is critical in reducing emissions during engine startup by injecting air into the exhaust stream, promoting more complete combustion of the fuel.

What are the symptoms of the P2259 code?

Symptoms associated with the P2259 code may involve:

• Illuminated check engine light.
• Increased emissions during a vehicle inspection.
• Possible rough idling or poor engine performance, particularly during cold starts.
• A decrease in engine efficiency or fuel economy.

What causes the P2259 code?

Common causes for the P2259 code include:

• A faulty air pump that fails to operate correctly.
• Damaged wiring or connectors in the air injection system.
• A malfunctioning control module responsible for the air injection system.
• Blockages or leaks within the air injection system, causing improper operation.

How to fix P2259?

To resolve the P2259 code, follow these steps:

• Inspect the Secondary Air Injection System for any visible damage or leaks.
• Test the air pump for proper operation and replace if necessary.
• Check wiring and connectors for corrosion, fraying, or breaks, and repair or replace as needed.
• Clear the fault code and perform a test drive to ensure the issue has been resolved.