Secondary Air Injection Pump Stuck On (Bank 1)
The P2444 code indicates that the secondary air injection (SAI) system pump is running continuously or stuck on for Bank 1. This system injects fresh air into the exhaust to reduce emissions during cold starts. When the pump stays 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 failed pump control module.
1. Most Common Causes
- SAI pump relay shorted or welded closed
- Pump control circuit shorted to battery voltage (B+)
- ECM/PCM internal driver or transistor failure
- SAI pump control valve stuck open
- Damaged wiring harness or connector with shorted pins
2. Symptoms You Will Notice
- SAI pump runs continuously even after engine is warm
- Loud humming or whining noise from pump area
- Battery drain or dead battery
- Check Engine Light illuminated
3. Step-by-Step Diagnosis
Step 1: Listen for pump operation with engine off; if pump runs continuously, proceed.
Step 2: Locate the SAI pump relay in the fuse box; swap with a known good relay to see if pump stops.
Step 3: Check for short to power in pump wiring using a multimeter; repair as needed.
Step 4: If relay and wiring are fine, test pump control module or replace pump assembly.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive for long periods as the pump may overheat or drain the battery, leaving you stranded.
How much does it cost to fix?▼
Typically $50-$150 for a relay or wiring repair; pump replacement can be $200-$400.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.