P0068 OBD-II Trouble Code: Air Assisted Injector Control Circuit High

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Cost of diagnosing the P0068 code

P0068 is a diagnostic trouble code (DTC) for "Air Assisted Injector Control Circuit High". 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.

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P0068 trouble code definition

Manifold Absolute Pressure or Mass Air Flow Sensor Throttle Position Correlation

What the P0068 code means

This code means that the manifold absolute pressure or mass air flow sensors that detect air flow through the air induction system and the intake manifold have readings that contradict the readings that are coming from the throttle position sensor. The throttle position sensor communicates to the powertrain control module how far open the butterfly valve is within the throttle body, and therefore the amount of air that should be introduced into the intake manifold.

What causes the P0068 code?

Possible causes of the P0068 code would include:

  • A faulty mass air flow sensor or the wiring that is associated with it
  • A faulty manifold absolute pressure sensor or the wiring that is associated with it
  • A vacuum leak on the intake manifold, air induction system, or throttle body
  • A loose or damaged electrical connection related to this system
  • A faulty or improperly installed throttle position sensor or the wiring that is associated with it

What are the symptoms of the P0068 code?

Some symptoms of the P0068 code that the driver may experience could include a rough engine idle during parked and deceleration conditions, a loss of power due to excess air that could be introduced into the system that could be affecting the air/fuel ratio, and of course the Check Engine Light.

How does a mechanic diagnose the P0068 code?

A mechanic would diagnose the P0068 code by inspecting and testing the manifold absolute pressure sensor, the mass air flow sensor, the throttle position sensor, the intake manifold, and the air induction system. As for the sensors, the mechanic would check to verify that all sensors are properly installed and tested for proper functionality. A mechanic would also check the engine for vacuum leaks in the intake manifold, throttle body, and air induction system via vacuum gauge and/or a smoke test.

Common mistakes when diagnosing the P0068 code

Common mistakes when diagnosing the P0068 code could include replacing fuel or ignition system parts by assuming the issue is a misfire, as this can make the engine run similarly. Another mistake when diagnosing this issue could include replacing one or more sensors without testing their functionality prior to the replacement. It is very important to verify all faults before attempting to make any repairs.

How serious is the P0068 code?

The P0068 code may not be serious at first, but could lead to the car having more serious conditions. The engine will likely run rough until the issue is resolved. If the engine is running rough for an extended period of time, engine damage may result. It would be advised to have this issue diagnosed and repaired as soon as possible in order to prevent further damage to the engine.

What repairs can fix the P0068 code?

Repairs that can fix the P0068 code would include:

Additional comments regarding the P0068 code

It would be advised to resolve the issues the P0068 code causes as soon as possible due to the fact that the fuel economy of your vehicle may suffer due to this code. If any vacuum leaks exist, the air/fuel mixture will be incorrect and cause the engine to run lean during idle. Although this causes the engine to use less fuel, it also causes a loss of power which therefore decreases fuel mileage.

Need help with a P0068 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.

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P0068
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Pardeep

19 years of experience
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Pardeep
19 years of experience
Chevrolet Impala - Check Engine Light is on Inspection - San Jose, California
Pardeep showed up at the time scheduled. He called prior to arriving and informed me of his arrival. He trouble shot he check eengine light. Step by step he informed me of what he was.checking, and answered was all my questions. He wasted no time and got the vehicle to run long enough to determine next steps we will need to take. He never tried to bs me, or false promises (Like the dealership). He explained what he could do and what he could not, in regards to repairs ifneeded. i had a good 1st tike experience with "Your Mechanic" . Although the previous mechanic (Brock) they had assigned canceled the appoinent I scheduled; saying that they could not perform what clealy, Pardeep was able to do. Thank you Pardeep! 

Michael

36 years of experience
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Michael
36 years of experience
Volkswagen Beetle - Check Engine Light is on - Brea, California
Michael is friendly and professional. He has lots of experience and tries his best to try and figure out what's wrong with your car.

Michael

10 years of experience
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Michael
10 years of experience
Chevrolet Malibu - Check Engine Light is on - Atlanta, Georgia
I would highly recommend Michael. He was professional and helped me to better understand car trouble.

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Nathan
15 years of experience
Hyundai Accent - Check Engine Light is on - Austin, Texas
Very Knowledgeable, quick response, and very kind! Thanks Nathan for your excellent customer service and repair assessment!

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