P2257 OBD-II Trouble Code: Secondary Air Injection System Control A Circuit Low

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Cost of diagnosing the P2257 code

P2257 is a diagnostic trouble code (DTC) for "Secondary Air Injection System Control A Circuit Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

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P2257 code definition

Secondary Air Injection System Control A Circuit Low

What the P2257 code means

P2257 is an OBD-II generic code. The Engine Control Module (ECM) monitors the secondary air injection system control valve A circuit, when the system is not activated and detected the circuit return voltage to be low. The ECM then activates the Check Engine Light and stores the P2257 code.

What causes the P2257 code?

  • The air injection control valve A has an open or short circuit.

  • A broken wire or connector for the control valve A at the valve connection.

  • An open wire on the power supply circuit from the ECM to control valve A.

  • An open or short on the return signal control wire back to the ECM from the control valve.

  • The ECM has an internal fault or defect.

What are the symptoms of the P2257 code?

  • The Check Engine Light will be illuminated and the code P2257 is set in ECM memory as a fault.

  • The ECM cannot control the secondary air injection valve A.

  • The ECM may go into failure management mode causing the engine to have reduced power.

How does a mechanic diagnose the P2257 code?

  • Scan codes and document the codes in the ECM and look at the freeze frame data for failure.

  • Measure the voltage to and from the air injection control valve A and check it per specifications.

  • Measure the resistance of the control valve circuit at the ECM and at the valve to check per specifications.

  • Check the harness for short or broken wires.

  • Follow the manufacturer pinpoint testing if the problem is not found.

Common mistakes when diagnosing the P2257 code?

  • Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired.

  • Failing to clear the ECM codes after the codes are fixed.

  • Failing to verify the fault before replacing any parts in the system.

How serious is the P2257 code?

Code P2257 is for the air injection system for the emission control of the engine. The injected air controls excessive fuel in the exhaust could leave the engine to burn off the excessive fuel, therefore causing the exhaust emission levels to stay below allowed levels. The vehicle fails emissions if this system is not working properly.

What repairs can fix the P2257 code?

  • Replacing the air injection control valve A for a short or open internal circuit.
  • Repair an open or short in the sensor wiring or connector to the air injection control valve.
  • Replace the ECM for an internal failure.

Additional comments for consideration regarding the P2257 code

Code P2257 may not cause an engine drive complaint on some vehicles but can cause the exhaust to overheat causing catalyst damage and failed emissions. The most common failure is the exhaust one way check valve, which allows hot exhaust to get to the the control valve and melt it causing this failure to happen. Check the one way check valve if the injection control valve show any signs of melting and replace both components.

Need help with a P2257 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
P2257
Check Engine Light

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Michael

17 years of experience
22 reviews
Michael
17 years of experience
Kia Forte - Check Engine Light is on - Bowie, Maryland
Great experience with Michael! He expertly went over the car issues and provided information on all inspection points. Thank you!

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25 years of experience
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Jonathan
25 years of experience
GMC Envoy - Check Engine Light is on - Atlanta, Georgia
Jonathan was amazing !!!! Incredibly friendly and extremely knowledgeable! I am very satisfied! Thank you Jonathan for making such a frustrating car situation feel like I have options now !

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23 years of experience
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23 years of experience
Saturn Ion - Check Engine Light is on - Washington, District of Columbia
Jermaine texted me to let me know that he was on his way. He was courteous and he arrived on time. Jermaine took the time to explain the problem I was having with my car and let me know that he would send a detailed report. I was more than happy with his service.

Andrew

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Andrew
14 years of experience
Toyota Echo - Check Engine Light is on - Beaverton, Oregon
Andrew arrived early, and got right to work. He knew the likely problem from my 10 second description, checked the vehicle diagnostics, and verified the diagnostics by swapping some parts and doing a quick test drive. He even showed me the OBD2 scanner output. The vehicle has over 151k miles, and Androw could easily have tried to upsell me on replacing all of the ignition coils, rather than just the faulty one, purely based on the vehicle's age -- but he didn't. He just replaced the one necessary, topped up fluids, mentioned it was time for an oil change and new tires in the back, and that was it. Everything was fixed inside of an hour, while working in the rain.


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