P2446Secondary Air Injection

Secondary Air Injection System Pump Stuck On (Bank 2)

The control module has determined that the secondary air injection pump on bank 2 is running when it should be off, or is stuck on. The pump should only run briefly during cold start. Continuous operation can damage the pump and upset air-fuel readings.

🚗 Yes, in most cases, but repair it soon. A pump that runs continuously can overheat and can affect fuel trim and emissions.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Faulty pump relay stuck closed$40-$150

35%

A welded or stuck relay keeps supplying power to the pump.

#2Short to power in pump circuit$80-$250

25%

A shorted control or supply wire keeps the pump energized.

#3Faulty secondary air pump$200-$500

25%

An internal fault keeps the pump running.

#4PCM control fault$200-$600

15%

The module fails to command the pump off.

🩺 Common Symptoms

Check engine light is on
Air pump audible after warm-up
Rough idle or altered fuel trim
Possible pump overheating

💰 Repair Cost: DIY vs Shop

DIY Cost

$40-$500

Shop Cost

$150-$650

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P2446

1Listen to confirm the pump runs when it should be off.

2Test the pump relay and its control circuit for a stuck-on condition.

3Check the pump supply wiring for a short to power.

4Replace the relay, wiring, or pump as indicated, then clear and retest.

❓ Frequently Asked Questions

How is this different from P2444?

It is the same stuck-on fault on bank 2 rather than bank 1. Diagnosis and repair are the same.

Is it urgent?

It is not an emergency, but repair it soon so the pump does not overheat and fail.

Can it affect how the engine runs?

Yes. Extra air in the exhaust can skew fuel trim and cause a rough idle.

🔗 Related Codes

P2444P2447P2442P0410P0418