P2438 Fault Code

Secondary Air Injection System Air Flow/Pressure Sensor Circuit High Bank 2

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

The P2438 fault code indicates an issue with the Secondary Air Injection System. This code specifically points to the air flow or pressure sensor circuit for Bank 2 being too high. This system is designed to help reduce emissions by injecting air into the exhaust stream during cold starts to help burn off excess fuel.

What are the symptoms of the P2438 code?

Symptoms associated with a P2438 fault code may include:

• Check Engine Light (CEL) illuminated on the dashboard
• Poor engine performance and reduced fuel efficiency
• Increased emissions at vehicle inspection
• Noise from the air injection system, if it's faulty
• Possible rough idling during cold start conditions

What causes the P2438 code?

Common causes of a P2438 code include:

• A faulty air flow or pressure sensor
• Wiring issues such as shorts or breaks in the circuit
• A defective Secondary Air Injection Pump
• Vacuum leaks in the air injection system
• Problems with the Engine Control Module (ECM)

How to fix P2438?

To resolve the P2438 code, follow these steps:

• Inspect the air flow or pressure sensor and its wiring for any visible damage.
• Test the operation of the Secondary Air Injection Pump to ensure it is functioning properly.
• Check for vacuum leaks in the air injection system.
• If the sensor is found to be faulty, replace it.
• Clear the fault codes and run the vehicle to see if the issue persists.