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.

Cars Estimate Credit towards follow-up repair Earliest Availability
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Toyota$20.00
BMW$20.00
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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.

trouble codes
P0068
Check Engine Light

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Michael

17 years of experience
22 reviews
Michael
17 years of experience
Kia Forte - Check Engine Light is on - Bowie, Maryland
Great experience with Michael! He expertly went over the car issues and provided information on all inspection points. Thank you!

Jonathan

25 years of experience
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Jonathan
25 years of experience
GMC Envoy - Check Engine Light is on - Atlanta, Georgia
Jonathan was amazing !!!! Incredibly friendly and extremely knowledgeable! I am very satisfied! Thank you Jonathan for making such a frustrating car situation feel like I have options now !

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23 years of experience
101 reviews
Jermaine
23 years of experience
Saturn Ion - Check Engine Light is on - Washington, District of Columbia
Jermaine texted me to let me know that he was on his way. He was courteous and he arrived on time. Jermaine took the time to explain the problem I was having with my car and let me know that he would send a detailed report. I was more than happy with his service.

Andrew

14 years of experience
346 reviews
Andrew
14 years of experience
Toyota Echo - Check Engine Light is on - Beaverton, Oregon
Andrew arrived early, and got right to work. He knew the likely problem from my 10 second description, checked the vehicle diagnostics, and verified the diagnostics by swapping some parts and doing a quick test drive. He even showed me the OBD2 scanner output. The vehicle has over 151k miles, and Androw could easily have tried to upsell me on replacing all of the ignition coils, rather than just the faulty one, purely based on the vehicle's age -- but he didn't. He just replaced the one necessary, topped up fluids, mentioned it was time for an oil change and new tires in the back, and that was it. Everything was fixed inside of an hour, while working in the rain.


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