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Engine-Codes – Subaru – P0066 Subaru

P0066 Subaru Code - Air Assisted Injector Control Circuit Or Circuit Low

Quick Answer

The P0066 diagnostic trouble code (DTC) for Subaru vehicles refers to a fault in the air assisted injector control circuit or a circuit that is operating at a lower than expected voltage level. Common causes include Faulty air assisted injector, Wiring issues or damaged connectors in the circuit, Faulty air assisted injector control module. 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
P0066 Subaru indicates Air Assisted Injector Control Circuit Or Circuit Low.
Common causes
Common causes include Faulty air assisted injector, Wiring issues or damaged connectors in the circuit, Faulty air assisted injector control module.
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 Aug 19, 2024
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Code P0066 Subaru Description

The P0066 diagnostic trouble code (DTC) for Subaru vehicles refers to a fault in the air assisted injector control circuit or a circuit that is operating at a lower than expected voltage level. The air assisted injector is a component that helps improve fuel atomization and combustion efficiency in the engine. When this circuit is not functioning properly, it can lead to issues with fuel delivery, combustion, and overall engine performance.

OBDII Code P0066 Subaru - Air Assisted Injector Control Circuit Or Circuit Low
P0066 Subaru Code - Air Assisted Injector Control Circuit Or Circuit Low

Common Causes of P0066 Subaru

  1. Faulty air assisted injector
  2. Wiring issues or damaged connectors in the circuit
  3. Faulty air assisted injector control module
  4. Corrosion or poor connection in the circuit
  5. Electrical issues such as a blown fuse or relay related to the circuit

Symptoms of P0066 Subaru

  1. Check engine light illuminated on the dashboard
  2. Rough idle or rough running engine
  3. Decreased engine power or acceleration
  4. Poor fuel efficiency
  5. Engine stalling or hesitation

How to Fix P0066 Subaru

  1. Perform a thorough inspection of the air assisted injector and its circuit for any visible damage or corrosion.
  2. Test the circuit with a multimeter to check for proper voltage levels and continuity.
  3. Replace any faulty components such as the air assisted injector, control module, or damaged wiring.
  4. Clear the DTC codes with an OBD-II scanner and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to pinpoint the exact cause of the issue.

Cost to Fix P0066 Subaru

The typical repair costs for addressing a P0066 code in a Subaru vehicle can vary depending on the specific cause of the issue and the labor rates in your area. In general, you can expect to pay anywhere from $100 to $500 for parts and labor. Keep in mind that diagnostic time and labor rates can vary, so it's advisable to check with local auto repair shops for more accurate pricing.

What does this mean?

Tech Notes for P0066 Subaru

The fault could cause the engine to idle rough and possibly stall. The Air Assist Injector Solenoid Valve is supplied power from the main relay and controlled by the Engine Control Module. The Air Assist Injector Solenoid Valve can be tested by manually applying voltage and ground in order to actuate it. Once the valve is open, the air passages within the valve and system can be checked for obstructions. The Air Assist Injector Solenoid Valve can also be actuated by connecting the green test mode connector located under the instrument panel (On driver' s side, the connector is normally unplugged). Once connected, the Air Assist Injector Solenoid Valve will be turned on and off with the key placed in the on, engine off position. It will continue to turn on and off until the green test mode connector is disconnected.

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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 P0066 Subaru Code

1. What are the common symptoms of OBDII code P0066 in a Subaru?

- Common symptoms include a rough idle, poor engine performance, decreased fuel efficiency, and potential stalling issues.

2. What does the OBDII code P0066 in a Subaru indicate?

- The code P0066 indicates a problem with the Air Assisted Injector Control Circuit or Circuit Low.

3. What are the possible causes of OBDII code P0066 in a Subaru?

- Possible causes include faulty air assisted injector, damaged wiring or connectors in the circuit, a defective air assisted injector control module, or a problem with the engine control module (ECM).

4. How can I diagnose the issue causing OBDII code P0066 in my Subaru?

- Diagnosing the issue may involve inspecting the air assisted injector, checking the wiring and connectors for damage, testing the air assisted injector control module, and scanning the ECM for any related faults.

5. Can I continue driving my Subaru with OBDII code P0066?

- It is not recommended to continue driving your Subaru with OBDII code P0066, as it can lead to further damage to the engine and emission control system.

6. How can I repair OBDII code P0066 in my Subaru?

- Repairing the issue may involve replacing the faulty air assisted injector, repairing or replacing damaged wiring and connectors, or replacing the air assisted injector control module.

7. Is it possible to reset the OBDII code P0066 in a Subaru by disconnecting the battery?

- Disconnecting the battery may reset the code temporarily, but it is important to diagnose and repair the underlying issue to prevent the code from reappearing.

8. Are there any specific maintenance tips to prevent OBDII code P0066 in a Subaru?

- Regularly inspecting the air assisted injector, checking the wiring and connectors for damage, and following the manufacturer's recommended maintenance schedule can help prevent code P0066.

9. Can a DIY enthusiast fix OBDII code P0066 in a Subaru?

- Depending on their skill level and access to tools, a DIY enthusiast may be able to diagnose and repair OBDII code P0066 in a Subaru, but it is recommended to seek professional help for complex issues.

10. How much does it typically cost to repair OBDII code P0066 in a Subaru?

- The cost of repairing OBDII code P0066 in a Subaru can vary depending on the underlying cause, parts needed, and labor costs, but it is advisable to obtain estimates from a qualified mechanic or repair shop.

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