P0065 OBD-II Trouble Code: Air Assisted Injector Control/Performance

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0065 code

P0065 is a diagnostic trouble code (DTC) for "Air Assisted Injector Control/Performance". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0065 DIAGNOSTIC Get a fair and transparent estimate upfront

Diagnostic Trouble Code (DTC): P0065

P0065 trouble code definition

Air Assisted Injector Control/Performance

What the P0065 code means

What this code means is that the manifold absolute pressure sensor is not detecting a change in intake manifold vacuum when the powertrain control module tells the air assisted control valve to open.

If the manifold absolute pressure sensor does not sense this change in the vacuum, a trouble code will set off the Check Engine Light.

What causes the P0065 code?

This code is most commonly set due to a faulty air assisted injector valve or damaged wiring that is associated with this valve. It is also possible that one or more of the vacuum lines that connect to the air assisted injector valve could be clogged, preventing proper operation of this system and therefore setting a Check Engine Light.

What are the symptoms of the P0065 code?

Rough idling, engine stalling, and in very bad cases the engine dying are all symptoms of the P0065 code. The air assisted injector system works to atomize the fuel better when the throttle closes after acceleration. During heavy acceleration, more fuel is necessary to keep the engine running correctly.

When the throttle closes and deceleration begins, the rate of fuel changes. The air assisted injector system is intended to assist with this sudden change in fuel rate to keep the engine running smoothly. If this system is not performing properly, the air-fuel mixture at idle may be out of specification therefore causing one or more of the symptoms listed above.

How does a mechanic diagnose the P0065 code?

A diagnostic procedure would likely start with disconnecting the vacuum lines from the air assisted injector valve and blowing compressed air through them with a blower to verify that they are not restricted. If the vacuum lines are restricted, replace them as necessary.

If the vacuum lines are not restricted, the air assisted control valve will be checked next. The procedure involves removing the sensor from the vehicle and applying battery voltage to it. If a click sound is heard, the valve is likely good. It also helps to blow into the inlet hole of the valve while applying and removing battery voltage from the valve. The rate of airflow through the valve should be different when battery voltage is applied than when voltage is not applied.

If the valve proves to be functional, the wiring for the valve would be checked next to ensure that the valve is getting power and a good ground. If the valve is good and the vacuum lines are clear, the problem likely lies within the wiring for this system.

Common mistakes when diagnosing the P0065 code

A common mistake when diagnosing the P0065 code would be replacing the air assisted control valve without testing it. This is called a process of elimination diagnosis and can often times lead to wasted time and money.

It is very important to follow the manufacturer's diagnostic procedure for testing certain parts to make sure they are actually faulty before replacing them.

How serious is the P0065 code?

It is unlikely that any serious damage could be caused by this code as long as the problem is repaired as soon as possible.

Long term driving with this code set in the powertrain control module may damage internal engine parts. This would be due to the fact that the engine has been running incorrectly for a long period of time and could cause abnormal wear to engine parts.

What repairs can fix the P0065 code?

  • Replacing the air assisted control valve

  • Cleaning out or replacing the vacuum lines that are associated with the air assisted injection system

  • Repairing or replacing wiring related to the air assisted injection system

  • Replacing the powertrain control module which is rare but still possible

Additional comments regarding the P0065 code

If the air assisted injector valve is faulty and requires replacement, it is a good practice to go ahead and replace all vacuum lines that are associated with it as a measure of preventative maintenance.

Hoses are made of rubber and can become brittle and crack over time. It is possible that these hoses are already brittle and may crack during removal of the air assisted injector valve. Having the extra hoses on hand would prevent future headaches due to accidental damage of old vacuum hoses.

Need help with a P0065 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.

trouble codes
P0065
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0065 code.

SCHEDULE P0065 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,144)

Rating Summary
5,685
221
51
35
152
5,685
221
51
35
152

Chris

11 years of experience
13 reviews
Chris
11 years of experience
Ford F-150 - Check Engine Light is on - North Salt Lake, Utah
We were having problems with our check engine light, and Chris was exceptionally thorough until he found the problem and could help resolve the situation. We appreciate having someone who cares enough to get the job done right, not just done. We will definitely use Chris' services in the future. Thanks Chris.

Leng

21 years of experience
2 reviews
Leng
21 years of experience
Mazda MPV - Check Engine Light is on - Seattle, Washington
Leng arrived on time and explained the issue that my van is having. I will make a follow up appointment for the fix. Friendly, easy to talk to, and professional - thank you very much!

Okela

13 years of experience
11 reviews
Okela
13 years of experience
Land Rover LR4 - Check Engine Light is on - Brooklyn, New York
Okela was incredible! He is super thorough and took time to walk us through the issues with our LR4. Couldn’t recommend more! Thank you Okela!!

Robert

37 years of experience
188 reviews
Robert
37 years of experience
Land Rover LR2 - Check Engine Light is on - Atlanta, Georgia
Robert arrived on time. Did a diagnostic check quickly. He was friendly, and gave great service. He knows how to work on a Land Rover.


More related articles

P0589 OBD-II Trouble Code: Cruise Control Multi-Function Input “B” Circuit**
P0589 means the ECM found a fault in the cruise control multi-function input B circuit, caused by faults within the cruise control electrical system.
P0429 OBD-II Trouble Code: Catalyst Heater Control Circuit
P0429 means that both of the heated oxygen sensors have malfunctioned in some way.
P2568 OBD-II Trouble Code: Direct O-Zone Reduction Catalyst Temperature Sensor Circuit Range/Performance
P2568 P2568 code definition Direct O-zone Reduction Catalyst Temperature Sensor Circuit Range/Performance What the P2568 code means P2568 is an OBD-II generic code that the engine control module (ECM) has detected the engine o-zone reduction catalyst temperature sensor to be...

Related questions

I just got the car two days ago and the engine light is on

Hey there, thanks for writing in about your 2010 Cadillac CTS. The light coming on may mean that they just cleared the code and light before selling you the car, or your light is on from a loose gas cap....

Cranking up

The Check Engine and Oil Pressure Light may flash if the oil pressure switch did not give an oil pressure signal to keep the fuel pump running. I suggest having the vehicle scanned for any codes, then test and replace...

Can't pass smog check due to Check Engine light

The Check Engine light requires a special scan tool to determine the issue. Additional diagnostics may be required. An intake leak is common on this engine and may cause leaks, low fluids, and many other issues. With the vehicle sitting...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com