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P0417 OBD-II Trouble Code: Secondary Air Injection System Switching Valve B Circuit Shorted

check engine light

P0417 code definition

When the PCM (powertrain control module) detects an issue with the secondary air injection system, it will store the P0417 code.

What the P0417 code means

To reduce emissions, the secondary air injection system uses outside air pumped through the engine’s exhaust system to reduce toxic emissions. While some variations in the amount of air brought in by the secondary air injection system will vary, all variances are monitored by the PCM. If the variation is greater than 10% of the manufacturer’s specifications, the P0417 code will be stored and the Check Engine Light will illuminate.

What causes the P0417 code?

Possible causes of the P0417 code include:

  • A damaged or faulty air pump
  • A poor electrical connection to the air bypass solenoid circuit
  • A shorted or open connection to the air bypass harness

What are the symptoms of the P0417 code?

A few of the most common symptoms that occur when the P0417 code is stored include:

  • Unusual noises coming from the secondary air injection system
  • Engine stalling at idle or upon startup
  • Hesitation when accelerating
  • An illuminated Check Engine Light

You may actually notice some of these problems before the Check Engine light illuminates. Whether or not you see the Check Engine light come on, if you notice any of these symptoms, you should get the issue resolved immediately.

How does a mechanic diagnose the P0417 code?

With an OBD-II scanner, the mechanic can identify the P0417 code and any other related codes that may have been stored. Once they’ve identified the code, they’ll then clear it in the PCM and do a visual inspection of the secondary air injection system. They’ll look for any damage to the electrical connections and wiring in the system and correct them if they find them. Once they’ve completed this task, they’ll test-drive the vehicle to determine if the code has been resolved.

If the code hasn’t been resolved, the mechanic will likely replace the air pump and retest the vehicle. They will then test-drive the car at least one more time to ensure that the code is not an intermittent problem and that it has been completely cleared.

Common mistakes when diagnosing the P0417 code

Some mechanics will go ahead and replace the secondary air injection pump without ensuring that a water drain is in place. This can lead to more air pump failures and repeated detection of the P0417 code.

How serious is the P0417 code?

Unlike some codes, the P0417 code will generally have some noticeable symptoms along with the Check Engine light coming on. Engine hesitation may or may not be detrimental to the condition of your engine, but it can cause problems while driving. Stalling on startup or when idling can also put you in unsafe situations, depending on where and how it happens. It’s best to get the issue resolved immediately and avoid potentially dangerous driving scenarios.

What repairs can fix the P0417 code?

Depending on what’s causing the P0417 code to be stored, a few different repairs can resolve it, including:

Additional comments for consideration regarding the P0417 code

When the P0417 code is set, your vehicle may be creating a higher level of toxic emissions. Whether or not this is the case, simply having the Check Engine light illuminated will mean that you cannot pass an OBD-II emissions test. This can preclude you from legally registering and driving your car in your state, so it’s important to get this code resolved and cleared ASAP to avoid bigger problems down the road.

Need help with a P0417 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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