Error Code P0068: What It Means & What To Do?

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If you are struggling with issues like reduced power form the engine, increased fuel consumption, irregular throttle response and Check Engine Light on, there it might be due the OBD Error Code P0068.

OBD Code P0068 is defined by Manifold Absolute Pressure or Mass Air Flow Sensor Throttle Position Correlation.

Error Code P0068 means the PCM has detected an excessive input voltage signal degree variation from the TIPS (Throttle Position Sensor) compared to the voltage input signals of MAF sensor and the MAP sensors. The PCM reads and analyses these individual engine drivability sensor signals, then compares them both to help develop the delivery of fuel and ignition timing tactics. The PCM depends on three sensors – namely the MAF, MAP and Throttle Position sensor. The engine contains a lot of sensors, but these three are associated with the error code.

The PCM also uses this information to ensure that the fuel-to-ratio level is always constant, controllable and acceptable to limitations fuel-to-air. If the voltages detected for these three sensors (triangulated) fail to correspond with the programmed parameters, even just one of the three sensors, for a specific period of time or specific engine revolutions, the trouble code P0068 will be registered.

What causes the problem of MAP/MAF – Throttle Position Correlation?

• Damaged/faulty MAF sensor
• Faulty MAP sensor
• Faulty wirings and connectors of the sensors
• Obstruction in air flow
• Dirty Air Cleaner
• Defective Electronic Throttle Body
• Obstruction in hose from intake manifold to MAP sensor
• Vacuum leakage in the intake manifold, air induction system, or throttle body
• Damaged/Loose electrical connection related to the sensor and circuit
• Faulty/Damaged or improperly installed Throttle Position Sensor

1. Intake Manifold - Vacuum leaks can cause intake manifold to go bad and hampers the fuel to air ratio causing engine misfires and more. Replace faulty intake manifolds immediately.
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3. Mass Air Flow Sensor - Wrong information sent by the sensor will affect the engine performance adversely. Thus, it is advisable to replace them in time.
4. Throttle Position Sensor - A bad TPS can cause loss of engine power along with engine stalling and deceleration during rough idles. Thus, replace it immediately.

It is important to notice the probable symptoms which can indicate towards the problem of MAF/MAP – Throttle Position Correlation. Following are the common symptoms of OBD Code P0068 Error.

Common Symptoms

• Drastic reduction of fuel efficiency
• Lack or reduced engine performance
• Rough running engine and idle causing deceleration and vehicle being dead stop in severe cases
• Hesitation upon acceleration
• Check Engine Light On

• Mounting or installation adjustment of the mass air flow (MAF) sensor, manifold absolute pressure (MAP) sensor, or throttle position sensor (TIP)
• Repairing or replacing wiring and connections related to the sensors and the circuits
• Checking for any vacuum leaks and repairing them immediately

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A qualified mechanics may need to conduct specific diagnostic steps, depending on the make and model of the vehicle. Also, mechanics uses other tools and testing equipment, such as the volt-ohmmeter, carburetor cleaner can, meter’s wire-piercing probe and an intake cleaner can.

• Check for damaged or broken wirings and connections in relation to the sensors and circuits.
• Check the air cleaner element and look for any signs of clamps or leaking in the pipe starting from the MAF to the Throttle body.
• Then, check the vacuum lines in intake manifold for any cracks, obstructions, or looseness, as these can cause vacuum loss.
• Detach every sensor and check the connector for signs of corrosion and bent pins that are pushed out.
• Inspect for leaky manifold in the intake and clean the carburetor using the carburetor cleaner. The engine RPM will change noticeably after a short shot of the carburetor cleaner over a leak.
• Check the throttle body for signs of coated coke (black greasy substance) and get it cleaned.
• Also check for any faults in the PCM and replace/reprogram it as necessary. Although this problem is rare but if all the other components are fine, then the check is necessary.

Common mistakes when diagnosing the P0068 code

Common mistakes when diagnosing the P0068 code include;

• Replacing fuel or ignition system parts
• Replacing one or more sensors without testing their functionality prior to the replacement.
• Not checking the wiring and connectors for damages
• Replacing PCM, without checking other components for errors