Skip the auto shop - Our mechanics make house calls

P2442 OBD-II Trouble Code: Secondary Air Injection System Switching Valve Stuck Open Bank 2

diagnostic trouble code logo

P2442 code definition

The P2442 code is a generic powertrain code related to the auxiliary emissions control system. This particular code appears when the bank 2 secondary air injection valve stays open.

The P2442 code is also related to:

What the P2442 code means

If a P2442 code comes up, a one-way check valve is stuck open in the secondary air injection system, causing too much airflow into the exhaust and allowing hot exhaust gas to travel back into the pump. If the PCM receives a voltage reading of more than 10% of the allowed amount the P2442 code will be stored.

The secondary air intake system is part of a vehicle’s emissions control system and works to support the function of the catalytic converter. The switching valves allow the air pump to pump air into the exhaust stream when an engine is cold, speeding up the process of warming the catalytic converter to burn unused fuel.

As unburned fuel is more toxic to the environment than burned fuel, high amounts of unburned fuel cause increased vehicle emissions.

What causes the P2442 code?

The P2442 trouble code occurs mostly in cold weather and can be caused by a number of potential issues, including:

  • Water sucked into the air injection pumps.
  • Damaged or defective vacuum switching or air valves
  • Damaged or defective pressure sensor
  • Poor or damaged electrical connections or shorted wiring.
  • Faulty air injection pump
  • Leaking air injection tubes.

What are the Symptoms of the P2442 Code?

Symptoms of a P2442 trouble code may include:

How Does a Mechanic Diagnose the P2442 Code?

A mechanic may use one or more methods to diagnose the P2442 code, including (but not limited to):

  • Utilize an OBD-II scanner to check for any trouble codes stored in the PCM

  • Test and check for damaged or defective one-way check valves

  • Check pumps for moisture

  • Check for any visible signs of damage, such as frayed or damaged wires due to corrosion or excess heat from exhaust gasses

  • Check for damaged hoses or fittings

  • Check for blown fuses

  • Clear code and test-drive to see if any codes reappear

Common Mistakes When Diagnosing the P2442 Code

The most common cause of the P2442 code is moisture in the air injection pumps. But, the issue may not be in the pump itself. If the secondary air injection pump is replaced and the root cause of the failed pump is not diagnosed, the pump may continue to fail, resulting in additional replacements.

How Serious is the P2442 Code?

Because the vehicle could go into “limp mode” or stall, YourMechanic considers this a potentially serious issue. Take the vehicle into your local dealer service center of repair shop for diagnosis and repair immediately.

What Repairs can fix the P2442 code?

  • Replace or repair defective or damaged one-way check valves
  • Replace or repair any faulty wiring
  • Replace or repair any faulty hoses or fittings
  • Replace any blown fuses
  • Clean pumps and assembly and test
  • Follow all the manufacturer's instructions in a related technical service bulletin

Additional Comments for Consideration Regarding the P2442 Code

Some manufacturers have issued technical service bulletins (TSBs) about this fault, so it’s always a good idea to check for any associated bulletins before making any repairs.

Need Help with a P2442 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

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.


Post a question and get free advice from our certified mechanics.


More related articles

Symptoms of a Bad or Failing Flexible Clutch Hose
Common signs include difficulty shifting, low clutch fluid, and feeling no resistance at the clutch pedal.
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...

Related questions

Q: P1743

This code is for a transmission overdrive solenoid problem. The overdrive solenoid would need to be tested to see if it has the proper resistance of 10 to 20 ohms. If it is okay then the harness will need to...

Q: Error code P2442

Hi. The code P2422 is an "EVAP canister vent shut valve close malfunction" code and is a manufacturer code that needs a little diagnosing before it can be replaced. If you need further assistance, I recommend you have a mechanic,...

Q: Car hesitating on acceleration.

Thanks for writing in about your Mazda 6. You need to make sure that the mass airflow sensor is not getting contaminated by an oil type air filter. If it is, replace the air filter with clean paper type one...