P2446: AIR System Pump Stuck On (Bank 2)

P2446 is the bank 2 entry for a secondary air pump that keeps running after being switched off. The code is meaningful only on engines with a separate pump per cylinder bank or where the system reports pump faults per bank; no manufacturer documents this code publicly. By analogy with GM's bank 1 code P2444, the check would run after the pump is commanded off and look for duct pressure that stays above the model, which points to a stuck relay, a shorted driver or a pump with an internal fault. Under CARB rules, AIR pumps, relays and valves count as comprehensive components and need their own monitoring. A pump that never stops can overheat, wear out quickly and load the battery. P2447 is the stuck-off code for bank 2; P2444 covers bank 1.

Low severity. Can I keep driving?Yes, you can keep driving, though it should be repaired: the car pollutes more at startup and may not pass an inspection.

Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.

Symptoms

Check engine lamp
Pump keeps humming after the warm-up phase

Most likely causes

Relay of the bank 2 pump stuck closed
Control circuit shorted to power
Faulty output driver in the engine computer

What to check, in order

Start with the simplest. You can tick off each step.

Listen for the pump running during a cold start
Use the scanner to command the movement and compare the actual position with the requested one.
Check the fuse and relay
Inspect the hoses and valve for moisture or carbon
Run the actuator test with the scanner

Good to know

Repair difficulty: easy
It affects emissions.

What each character of P2446 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
4: Emissions
46: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2446?

Yes, you can keep driving, though it should be repaired: the car pollutes more at startup and may not pass an inspection.

What causes code P2446?

The most common causes are: relay of the bank 2 pump stuck closed; control circuit shorted to power; faulty output driver in the engine computer.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.