What is secondary air injection?

It pumps fresh air into the exhaust manifold on cold starts to help the catalytic converter reach operating temperature faster.

Is P0411 expensive to fix?

The check valve is cheap ($30-$50). If the air pump has failed, it can be $150-$300 for the pump.

P0411

Low Severity

Secondary Air Injection System Incorrect Flow

Emissions System

What Does P0411 Mean?

The secondary air injection system is not flowing properly. This system pumps fresh air into the exhaust on cold starts to help the cat warm up.

Common Fix

Replace check valve or air pump

Estimated Cost (DIY)

$30 - $300

Symptoms

⚠️Check engine light
⚠️Failed emissions test
⚠️Slight noise from air pump on cold start

Related Symptoms

Check engine light on

Common Causes

Failed air pumppossible

Stuck check valvelikely

Clogged air injection passagespossible

Relay or fuse issuepossible

How to Diagnose P0411

1Check air pump relay and fuse
2Listen for air pump on cold start
3Inspect check valve for sticking
4Check passages for carbon blockage

OEM Diagnostic Flowchart

Scroll to load technician if/then branches.

Read live data and freeze frame for P0411 to pinpoint the cause before buying parts.

Recommended

TopScan

$51.27

DIYers who want phone-based scanning

View on TOPDON

ArtiLink600

$99

DIYers working on ABS/airbag systems

View on TOPDON

Related Resources

Repair guides, symptom pages, and wiring diagrams related to P0411.

OEM Manual Evidence

Browse →

2013 GMC Truck Terrain AWD L4-2.4L A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Terrain AWD L4-2.4L Service Manual | Operation CHARM Operation CHARM : Car repair m...

2013 GMC Truck Terrain FWD L4-2.4L A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Terrain FWD L4-2.4L Service Manual | Operation CHARM Operation CHARM : Car repair m...

2013 Chevy Truck Equinox FWD L4-2.4L A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 2013 Chevy Truck Equinox FWD L4-2.4L Service Manual | Operation CHARM Operation CHARM : Car repair...

2013 Chevy Truck Equinox AWD L4-2.4L A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 2013 Chevy Truck Equinox AWD L4-2.4L Service Manual | Operation CHARM Operation CHARM : Car repair...

Related Symptoms

Browse →

Check engine light onSymptom Hub

A check-engine light is a graph entry point into code pages, symptom-specific diagnosis, and the exact repair categories most often associated with those failures.

Exact Vehicle Hubs

Browse →

2013 Chevy Truck Equinox Awd L4 2.4l Repair HubManual

Open the exact vehicle hub grounded by OEM manual evidence related to P0411.

2013 Chevy Truck Equinox Fwd L4 2.4l Repair HubManual

Open the exact vehicle hub grounded by OEM manual evidence related to P0411.

2013 Gmc Truck Terrain Awd L4 2.4l Repair HubManual

Open the exact vehicle hub grounded by OEM manual evidence related to P0411.

2013 Gmc Truck Terrain Fwd L4 2.4l Repair HubManual

Open the exact vehicle hub grounded by OEM manual evidence related to P0411.

Related Codes

P0401: EGR Insufficient FlowRelated

The EGR is not flowing enough exhaust gas. Usually carbon buildup blocking the passages.

Frequently Asked Questions

What is secondary air injection?: It pumps fresh air into the exhaust manifold on cold starts to help the catalytic converter reach operating temperature faster.
Is P0411 expensive to fix?: The check valve is cheap ($30-$50). If the air pump has failed, it can be $150-$300 for the pump.

Need a diagnosis for your specific vehicle?

Start Free AI Diagnosis →

100% Free — No signup required