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

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P2257 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

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.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P2257 DIAGNOSTIC Get a fair and transparent estimate upfront

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

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P2257 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,869

Rating Summary
4,482
187
48
28
124
4,482
187
48
28
124

Peter

41 years of experience
1251 reviews
Peter
41 years of experience
Chevrolet Cruze - Check Engine Light is on Inspection - Phoenix, Arizona
I requested Your Mechanic’s services due to my check engine light coming on. Peter showed up early and was able to diagnose and fix the issue in a timely manner. Peter was also very pleasant and I was charged a fair price for the repair. I’ve also had Peter fix my car on two previous occasions and I was very pleased with his services those times as well. I would definitely recommend him to fix your car as well!

Arturo

25 years of experience
64 reviews
Arturo
25 years of experience
Toyota Matrix - Check Engine Light is on - San Diego, California
Absolutely Excellent. He can answer any inquiries I had and very knowledgeable. Also very helpful and genuine. In addition he gave good recommendations on my car care. I am very glad I found "your mechanic".

Albert

13 years of experience
23 reviews
Albert
13 years of experience
Ford Fusion - Check Engine Light is on - Riverside, California
Albert showed up early, was very professional and informative, would definitely recommend to family and friends

William

15 years of experience
9 reviews
William
15 years of experience
Ford Crown Victoria - Check Engine Light is on - Denver, Colorado
William was such a great help on helping me not only diagnose my vehicle but also helped me better understand my own Car! Such a great experience for my first time using Your Mechanic

More related articles

P0797 OBD-II Trouble Code: Pressure Control Solenoid C Stuck On
P0797 means that there is a problem in one of the electronic pressure control solenoids or circuits due to a faulty solenoid, or low or dirty fluid.
P2323 OBD-II Trouble Code: Ignition Coil H Secondary Circuit
P2323 P2323 code definition Ignition Coil H Secondary Circuit What the P2323 code means This trouble code indicates that the powertrain control module has detected a malfunction in the primary or secondary circuit in one or more of the ignition...
P0206 OBD-II Trouble Code: Injector Circuit Malfunction - Cylinder 6
P0206 code definition Injector Circuit Malfunction - Cylinder 6 What the P0206 code means When a P0206 code is seen, the Engine...

Related questions

I just had water pump replaced and I'm having issues.

Hello. It sounds like something was not reinstalled correctly. The fact that the Check Engine Light is flashing tells me that there is an engine misfire. This can be caused by a loose connection or it may be something that...

Purge flow sensor code

Hi, it is fairly rare for this to happen with a purge flow issue. Purge flow refers to the cars EVAP system. This system collects the fuel that evaporates inside the gas tank to ensure that pretty much 100% of...

P0843

Trouble code P0843 pops up quite frequently on vehicles such as your Honda CR-V. The 2nd clutch transmission pressure switch is installed in the hydraulic pressure circuit to the 2nd clutch. The Powertrain Control Module (PCM) uses this information to...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com