Engine-Codes.com
Engine-Codes – Generic – P0066

P0066 Code - Air Assisted Injector Control Circuit Or Circuit Low

Quick Answer

The P0066 diagnostic trouble code (DTC) refers to the Air Assisted Injector Control Circuit or Circuit Low. Common causes include Faulty air assisted injector control circuit, Wiring issues such as a short or open circuit, Defective air assisted injector. 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 indicates Air Assisted Injector Control Circuit Or Circuit Low.
Common causes
Common causes include Faulty air assisted injector control circuit, Wiring issues such as a short or open circuit, Defective air assisted injector.
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
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0066 Description

The P0066 diagnostic trouble code (DTC) refers to the Air Assisted Injector Control Circuit or Circuit Low. This code indicates that there is a problem with the circuit that controls the air assisted injector system in the vehicle. The air assisted injector system is responsible for injecting additional air into the exhaust system to help reduce emissions and improve overall engine performance. When this circuit is not functioning properly or is operating at a low voltage, it can have a significant impact on the vehicle's performance, fuel efficiency, and emissions levels.

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

Common Causes of P0066

  1. Faulty air assisted injector control circuit
  2. Wiring issues such as a short or open circuit
  3. Defective air assisted injector
  4. ECU (Engine Control Unit) malfunction
  5. Poor electrical connection or corrosion in the circuit

Symptoms of P0066

  1. Check Engine Light illuminated on the dashboard
  2. Reduced engine performance or power
  3. Rough idling or stalling
  4. Poor fuel efficiency
  5. Increased emissions output

How to Fix P0066

  1. Begin by conducting a thorough inspection of the air assisted injector control circuit, wiring, and connectors for any visible damage or corrosion.
  2. Test the air assisted injector system using a multimeter to check for proper voltage and resistance.
  3. Replace any faulty components such as the air assisted injector or damaged wiring.
  4. Clear the diagnostic trouble codes from the ECU using a scan tool and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, consult a professional mechanic or dealership for further diagnostics and repairs.

Cost to Fix P0066

The typical repair costs for a P0066 code can vary depending on the specific vehicle make and model, as well as the extent of the issue. On average, repairing the air assisted injector control circuit or circuit low can range from $200 to $500, including parts and labor. However, it is important to note that diagnostic time and labor rates at auto repair shops can fluctuate, so it is advisable to obtain a personalized estimate based on your vehicle's requirements and location.

What does this mean?

Tech Notes for P0066

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.

Need more information about the P0066 code?

Need more information on how to fix the P0066 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0066 code diagnosed by a professional: Find a repair shop in your area

Code P0066 Information for Specific Makes

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 Code

No Frequently Asked Questions about P0066 Code found.

Discuss the causes and fixes for P0066 OBDII Code

Submit a New Comment

Code P0066 comments

No comments found for this page.