P1416
Secondary Air Injection (AIR) System Bank 2
Get Your FREE AI Diagnostic Report
Enter your vehicle for a personalized diagnosis for code P1416
The P1416 code is a GM-specific code indicating a fault in the Secondary Air Injection (AIR) system on Bank 2. This system pumps fresh air into the exhaust during cold starts to help the catalytic converter heat up faster and reduce cold-start emissions. It typically only runs for the first 30–90 seconds after a cold engine start.
The most common failure on GM trucks, SUVs, and Corvettes is a seized air pump motor. When the check valve fails, exhaust condensation flows backward into the pump housing. In cold weather, this moisture freezes and locks the pump. When the PCM commands the pump on during the next cold start, it can't spin, and the code sets. Replacing the check valve along with the pump is critical to prevent the new pump from suffering the same fate.
This code rarely causes any noticeable driveability symptoms — the vehicle will run and drive normally. However, it will cause a failed emissions inspection and keep the check engine light on. The repair is moderately accessible for DIYers, though the air pump can be in a tight location depending on the vehicle.
Severity
Symptoms
- •Check engine light is on
- •May hear a whining or buzzing noise from the air pump on cold starts
- •Slightly elevated exhaust emissions
- •No noticeable difference in driveability in most cases
- •Possible sulfur or rotten egg smell from exhaust
Likely Causes
Exhaust condensation can enter the air pump through a failed check valve, freezing or seizing the pump motor — especially in cold climates. This is extremely common on GM trucks and SUVs.
The one-way check valve in the AIR system prevents exhaust gases from flowing back into the air pump. When it fails, moisture enters the pump and exhaust pressure disrupts normal airflow.
The relay that powers the secondary air pump may have failed, or the fuse may have blown, preventing the pump from operating on cold starts.
Wiring exposed to road salt, moisture, and heat can corrode or break, cutting power or ground to the air injection pump.
Carbon buildup in the passages where fresh air is injected into the exhaust manifold can restrict flow and prevent the system from functioning properly.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Replace the secondary air injection pump
- Replace the failed check valve(s)
- Test and replace the air pump relay or fuse
- Inspect and repair corroded wiring and connectors
- Clean carbon from the air injection passages