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Engine-Codes – Subaru – P1122 Subaru

P1122 Subaru Code - Pressure Sources Switching Valve Circuit High Input

Quick Answer

The P1122 Subaru code refers to the Pressure Sources Switching Valve Circuit High Input. Common causes include Faulty pressure sources switching valve, Wiring or connector issues in the valve circuit, ECM malfunction. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1122 Subaru indicates Pressure Sources Switching Valve Circuit High Input.
Common causes
Common causes include Faulty pressure sources switching valve, Wiring or connector issues in the valve circuit, ECM malfunction.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1122 Subaru Description

The P1122 Subaru code refers to the Pressure Sources Switching Valve Circuit High Input. This means that the Engine Control Module (ECM) has detected a high voltage input signal from the pressure sources switching valve circuit. The pressure sources switching valve is responsible for controlling the flow of air in the intake manifold, which is crucial for proper engine performance.

OBDII Code P1122 Subaru - Pressure Sources Switching Valve Circuit High Input
P1122 Subaru Code - Pressure Sources Switching Valve Circuit High Input

Common Causes of P1122 Subaru

  1. Faulty pressure sources switching valve
  2. Wiring or connector issues in the valve circuit
  3. ECM malfunction
  4. Vacuum leaks in the intake manifold
  5. Dirty or clogged air filter

Symptoms of P1122 Subaru

  1. Rough idling
  2. Engine stalling
  3. Hesitation during acceleration
  4. Lack of power
  5. Failed emissions testing

How to Fix P1122 Subaru

  1. Begin by performing a thorough inspection of the pressure sources switching valve, wiring, and connectors. Replace any damaged components.
  2. Check for vacuum leaks in the intake manifold and repair as necessary.
  3. Clear the diagnostic trouble codes from the ECM and reset the system.
  4. Test drive the vehicle to ensure that the issue has been resolved and that the symptoms have been eliminated.
  5. If the problem persists, consider consulting a professional mechanic for further diagnosis and repair.

Cost to Fix P1122 Subaru

The typical repair costs for addressing the P1122 Subaru code can vary depending on the specific cause of the issue. In general, the cost of parts for this repair can range from $100 to $300, while labor costs can range from $150 to $400. Overall, the total repair cost could be anywhere from $250 to $700. It is important to note that the actual cost may vary based on the location, vehicle make and model, and the labor rates of the auto repair shop. It is recommended to get a detailed estimate from a qualified mechanic before proceeding with the repair.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1122 Subaru Code

1. What are the common symptoms of OBDII code P1122 in a Subaru?

- Common symptoms include rough idling, engine stalling, decreased fuel efficiency, and potential difficulty starting the vehicle.

2. What could cause the Pressure Sources Switching Valve Circuit High Input code (P1122) in a Subaru?

- The code P1122 in a Subaru is often caused by a faulty pressure switching valve, damaged wiring or connectors, or issues with the engine control module (ECM).

3. How can I diagnose the Pressure Sources Switching Valve Circuit High Input code (P1122) in my Subaru?

- Diagnosing P1122 involves using an OBDII scanner to retrieve the code, inspecting the pressure switching valve and related wiring for damage, and testing the valve's functionality.

4. Can a DIYer repair the P1122 code in a Subaru?

- Repairing the P1122 code in a Subaru may be possible for experienced DIYers with proper tools and knowledge. However, due to the complexity of the system, it is recommended to consult a professional mechanic for accurate diagnosis and repair.

5. How much does it typically cost to fix the Pressure Sources Switching Valve Circuit High Input code (P1122) in a Subaru?

- The cost of fixing the P1122 code in a Subaru can vary depending on the root cause of the issue. It may range from $100 to $500 or more, including parts and labor.

6. Is it safe to continue driving with the OBDII code P1122 in my Subaru?

- While it may be possible to drive with the P1122 code present, it is not recommended as it can lead to further damage to the engine or emissions system. It is advisable to address the issue promptly.

7. Can a bad oxygen sensor trigger the P1122 code in a Subaru?

- Yes, a faulty oxygen sensor can sometimes trigger the P1122 code in a Subaru. It is important to properly diagnose the root cause of the code to ensure the correct repair is performed.

8. How long does it typically take to repair the P1122 code in a Subaru?

- The repair time for the P1122 code in a Subaru can vary depending on the exact cause of the issue and the availability of parts. It may take a few hours to a full day for the repair to be completed.

9. Are there any preventive maintenance tips to avoid the P1122 code in a Subaru?

- Regularly servicing and maintaining your Subaru, including checking for signs of wear on the pressure switching valve and related components, can help prevent issues that may trigger the P1122 code.

10. Will resetting the OBDII code P1122 in my Subaru make it go away permanently?

- Resetting the P1122 code in a Subaru may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return. It is crucial to diagnose and fix the root cause of the problem.

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