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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.
Manifold Absolute Pressure or Mass Air Flow Sensor Throttle Position Correlation
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.
Possible causes of the P0068 code would include:
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.
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 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.
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.
Repairs that can fix the P0068 code would include:
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.
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.