Code
P2448
Generic
P — Powertrain
AIR System High Air Flow Bank 1
AI status
Completed
Completed
100%
Causes
- Stuck-open AIR control valve (secondary air control valve)
- Failed or shorted AIR pump control solenoid or wiring
- Mechanical failure or overspeeding of the AIR pump
- Faulty AIR pressure/flow sensor or incorrect sensor signal
- Blocked or damaged one-way check valve causing abnormal flow behavior
- Aftermarket or incorrect replacement pump or plumbing altering flow characteristics
Symptoms
- MIL (Malfunction Indicator Lamp) illuminated
- Failed emissions test or elevated HC/NOx readings
- Unusual airflow/noise from AIR pump on cold start
- Rough idle or stalling during engine warm-up (in some cases)
- Abnormal upstream/downstream O2 sensor readings during cold start
What to check
- Read and record freeze frame and live data with a scan tool (AIR flow/pressure, solenoid command, pump current)
- Verify related codes and freeze-frame conditions (engine temp, duty cycle, rpm)
- Visual inspection of AIR pump, hoses, valves, check valve and plumbing for damage or leaks
- Back-probe solenoid connector for voltage and ground with key on/engine cranking
- Check pump operation and listen for unusual noises during activation
- Inspect wiring and connectors for corrosion, damage, or poor grounds
Signal parameters
- AIR pump command (ON/OFF or duty %)
- AIR pump current draw (amps) or pump voltage
- AIR pressure/flow sensor voltage or frequency (if equipped)
- AIR solenoid control voltage and ground presence
- Upstream and downstream O2 sensor voltages during cold-start cycle
- Engine coolant temperature at time of failure (freeze-frame)
Diagnostic algorithm
- Connect a capable scan tool and read freeze frame; note engine temp, rpm, and AIR system parameters
- Verify MIL and confirm P2448 is current and not historical; check for related codes (O2, EVAP, PCM faults)
- Visually inspect AIR pump, hoses, control valve, and one-way check valve for leaks, blockages, or incorrect installation
- With ignition on (engine off), command AIR pump/solenoid ON via scan tool and observe: - pump electrical feed and ground - solenoid operation and valve movement - compare commanded vs actual flow/pressure readings
- If pump runs with no solenoid command or excessive flow occurs, inspect/replace AIR control valve or check valve (stuck open)
- Measure pump current under operation; compare to spec. High or low current can indicate mechanical pump failure or electrical issue
- If sensor values are suspect, back-probe sensor signals and compare to expected voltages/frequencies. Replace sensor if out of range and wiring is good
- Perform smoke or pressure test on AIR plumbing to find leaks or improper flow paths
- If wiring and components check good, check for available TSBs or PCM software updates; perform PCM reflash if recommended by manufacturer
- Replace suspected failed components one at a time and clear codes; verify proper operation through multiple cold-start cycles
Likely causes
- Stuck or mechanically jammed AIR control valve
- Faulty AIR pump control solenoid or wiring (short/open)
- Damaged or missing one-way check valve
Fault status
Status
Malfunction Indicator Lamp (MIL) ON — Secondary Air Injection system high air flow detected on Bank 1. Emissions control may be affected.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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