P2448 Fault Code

Secondary Air Injection System High Air Flow Bank 1

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

The P2448 fault code indicates an issue with the secondary air injection system, specifically relating to high air flow in Bank 1 of the engine. This system is responsible for injecting air into the exhaust stream during cold starts to help reduce emissions and ensure optimal performance. When the flow of air exceeds the expected values, the engine control module (ECM) triggers a fault code.

What are the symptoms of the P2448 code?

Symptoms associated with the P2448 fault code may include:

• Increased exhaust emissions, leading to potential failed emissions tests.
• Check Engine Light illumination on the dashboard.
• Unusual engine noises from the secondary air injection pump or related components.
• Decreased fuel efficiency due to the system operating incorrectly.

What causes the P2448 code?

Common causes of the P2448 code include:

• A faulty secondary air injection pump that is overactive.
• Leaks or blockages in the air injection lines.
• Malfunctioning check valves allowing backflow.
• Electrical issues such as short circuits or broken wires in the air injection system.
• Faulty engine control module (ECM) that misinterprets sensor readings.

How to fix P2448?

To resolve the P2448 fault code, consider the following steps:

• Inspect and replace the secondary air injection pump if it is found to be faulty.
• Check for leaks in the air injection hoses and repair or replace damaged components.
• Verify the operation of check valves, ensuring they are functioning correctly and not allowing backflow.
• Test the electrical connections and wiring related to the secondary air injection system for any faults.
• Clear the fault code and perform a test drive to see if it returns; if it does, further diagnosis may be needed.