P2257Fuel & Air Metering

Secondary Air Injection System Control A Circuit Low

P2257 means the secondary air injection system control A circuit is reading too low. The secondary air system helps warm the catalyst on cold start, and a fault usually points to the control circuit, relay, or pump.

🚗 Yes, but have it checked at your next service.

LOW

severity

🎯 Top Causes, Ranked by Likelihood

#1Faulty secondary air pump$150-$600

35%

The pump or its control fails to operate correctly.

#2Wiring or connector fault$50-$300

30%

A short to ground pulls the control circuit low.

#3Faulty relay or solenoid$30-$200

25%

The control relay or valve fails.

#4Control module fault$300-$1000

10%

Rarely, the module driver fails.

🩺 Common Symptoms

Check engine light
Failed emissions test
Possible cold-start noise change
No major drivability change

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$600

Shop Cost

$150-$700

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P2257

1Inspect the secondary air control wiring for shorts

2Test the relay and solenoid operation

3Check the air pump for operation

4Replace the failed component

❓ Frequently Asked Questions

Can I drive with P2257?

Yes, but it can affect emissions and cold-start performance.

How much to fix P2257?

Anywhere from $150-$700 depending on the failed part.

What causes P2257 most often?

A faulty secondary air pump or a short in the control circuit.

🔗 Related Codes

P2258P0410P0411P0413P0418