OBD-II Generic Error Code P2446: How to Fix It

Q: Can I drive my car with a P2446 code?

Yes, P2446 is generally considered a medium-severity code and will not immediately damage your engine or prevent your vehicle from running. However, the check engine light will keep your car from passing an emissions inspection, and leaving the issue unresolved can eventually stress the pump motor or relay and potentially affect fuel economy. It is best to diagnose and repair it within a few weeks.

Q: What is the most common cause of the P2446 code?

The most common causes are a failed secondary air injection pump motor, a stuck or faulty air switching valve, a burnt relay, or a wiring fault. Water intrusion into the SAI pump is especially common in cold climates and can cause the motor to seize or corrode internally. Start with the relay and switching valve before replacing the more expensive pump.

Q: How much does it cost to fix a P2446 code?

Costs vary depending on the root cause. A relay replacement typically costs $10–$30 in parts. An air switching valve runs $30–$100. A secondary air injection pump itself can range from $80 to $300 or more depending on your vehicle make and model. If you need a shop to do the repair, expect to add $100–$200 in labor. Total professional repair costs typically range from $200 to $600.

Q: Will P2446 cause me to fail an emissions test?

Yes. Any active check engine light will cause you to fail an emissions or smog inspection in most states and countries. Even if the light clears temporarily, the readiness monitors must complete a full drive cycle after clearing before the vehicle will pass. Fix the root cause of P2446 first, then complete a proper drive cycle before heading to the emissions test station.

Q: What is the difference between P2446 and P2444?

Both codes relate to the secondary air injection system stuck on, but they refer to different engine banks. P2444 indicates the pump is stuck on for Bank 1 (the side containing cylinder #1), while P2446 indicates the same problem for Bank 2. If both codes appear together, the issue may be in a shared component like the main relay, the ECM output, or the pump itself if your vehicle uses a single pump for both banks.

Abstract

The P2446 error code means your vehicle's secondary air injection (SAI) pump is stuck in the 'on' position for Bank 2 — the side of the engine that does NOT contain cylinder #1. This system pumps fresh air into the exhaust during cold starts to help burn off excess emissions and bring the catalytic converter up to operating temperature faster. When the pump gets stuck on, it can cause rough idling, increased fuel consumption, and will trigger your check engine light.