Secondary Air Injection Pump Stuck On Bank 2
The P2446 code indicates that the secondary air injection (SAI) system pump is stuck in the 'on' position for Bank 2. This system reduces cold-start emissions by injecting fresh air into the exhaust. When the pump remains on, it can cause excessive noise, drain the battery, and potentially damage the pump or relay. The issue is often due to a stuck relay, short circuit, or PCM failure.
1. Most Common Causes
- SAI pump relay with welded or stuck-closed contacts
- Faulty SAI relay control module
- Short circuit to ground or battery voltage in the pump circuit wiring
- Secondary air switching valve stuck open
- Failed SAI system differential pressure sensor (if equipped)
- Internal ECM/PCM fault keeping the control signal active
- Corroded or damaged electrical connections in the SAI harness
2. Symptoms You Will Notice
- SAI pump runs continuously even after engine warm-up
- Check Engine Light illuminated
3. Step-by-Step Diagnosis
Step 1: Listen for pump operation with engine off; if running, proceed.
Step 2: Locate and test the SAI pump relay; check for stuck contacts.
Step 3: Inspect wiring for shorts to battery voltage.
Step 4: If relay and wiring are OK, suspect PCM failure.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended as the pump may run continuously, draining the battery and potentially causing a fire or pump damage.
How much does it cost to fix?▼
Typically $50-$150 for relay replacement; PCM replacement can cost $500-$1000.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.