P0068 Fault Code

P0068 OBD-II Trouble Code Short Description

MAP/MAF - Throttle Position Correlation

What does trouble code P0068 mean?

The P0068 fault code refers to a problem in the correlation between the Manifold Absolute Pressure (MAP) sensor and the Throttle Position sensor (TPS) in the car's engine.

When this error code is triggered, it suggests that there is a discrepancy or inconsistency in the signals received from these two sensors. The MAP sensor measures the intake manifold's pressure, while the TPS monitor's the throttle plate position. These two sensors play crucial roles in engine performance and combustion optimization.

When the correlation between the MAP and TPS is disrupted, it can lead to various issues, including poor engine performance, rough idling, stalling, reduced fuel efficiency, and even potential damage to the engine components.

To diagnose and fix this problem, the following steps can be taken:

  1. Visual Inspection: Check for any loose connections, damaged wires, or vacuum leaks near the MAP and TPS sensors.
  2. Sensor Inspection: Verify if the MAP and TPS sensors are functioning correctly. This can be done using a diagnostic tool or multimeter to measure the sensor's output values.
  3. Cleaning or Replacing Sensors: If the sensors are dirty or appear to be faulty, they may need to be cleaned or replaced. Cleaning can be done using electronic sensor cleaners, while replacement should be done with OEM or high-quality aftermarket sensors.
  4. Wiring and Connector Check: Ensure that the wiring harness and connectors associated with the MAP and TPS sensors are intact and properly connected.
  5. Sensor Calibration: After replacing the sensors, some vehicles may require a sensor calibration or reprogramming using specialized diagnostic equipment.

It is essential to address the P0068 fault code promptly to avoid any potential engine damage and ensure optimal performance. If you are unsure or uncomfortable performing these steps yourself, it is best to consult a professional mechanic or automotive technician to properly diagnose and resolve the issue.


What are the symptoms of the P0068 code?

The P0068 fault code refers to a problem with the correlation between the manifold absolute pressure (MAP) sensor and the throttle position sensor (TPS). This code usually indicates an issue with the throttle body or its related components. Here are the common symptoms associated with the P0068 fault code:

  • Check Engine Light (CEL) or Malfunction Indicator Lamp (MIL) is illuminated.
  • Reduced engine power or lack of acceleration.
  • Rough idling or stalling.
  • Hesitation or jerking during acceleration.
  • Poor fuel economy.
  • Possible black smoke from the exhaust.

If you are experiencing any of these symptoms, it is recommended to have your vehicle diagnosed and repaired by a qualified mechanic to avoid further damage or potential safety issues.


What causes the P0068 code?

The P0068 fault code is related to the MAP (Manifold Absolute Pressure) or MAF (Mass Air Flow) sensor and throttle position correlation. It indicates that there is a problem with the relationship between the readings from these sensors and the throttle position.

Possible causes for the P0068 fault code on cars may include:

  1. Faulty MAP or MAF sensor: The sensor may be malfunctioning, providing incorrect readings or no readings at all.

  2. Dirty or clogged MAP or MAF sensor: Accumulated dirt or debris on the sensor can cause it to provide inaccurate readings and lead to a correlation issue.

  3. Throttle position sensor (TPS) malfunction: If the TPS is not functioning properly, it may not accurately communicate with the MAP or MAF sensor, resulting in a correlation problem.

  4. Vacuum leak: A leak in the intake manifold or vacuum lines can disrupt the pressure readings and cause a correlation issue.

  5. Wiring or electrical connection problems: Faulty wiring or loose connections between the sensors and the engine control module (ECM) can prevent accurate data transmission, leading to a correlation fault.

To diagnose and fix the P0068 fault code, it is recommended to:

  1. Inspect the MAP or MAF sensor: Check for any signs of damage, dirt, or clogs. Clean or replace the sensor if necessary.

  2. Check the throttle position sensor (TPS): Ensure that the TPS is functioning correctly and providing accurate readings. Replace it if needed.

  3. Inspect for vacuum leaks: Examine the intake manifold, hoses, and vacuum lines for any signs of leaks. Repair or replace any damaged components.

  4. Check the wiring and connections: Inspect the wiring harness and connectors related to the MAP or MAF sensor, TPS, and ECM. Repair any damaged wires and ensure tight connections.

After addressing the potential causes, it is important to clear the fault code with a diagnostic scanner and then test drive the vehicle to verify if the issue has been resolved. If the fault code returns, further inspection and troubleshooting may be necessary.

Possible Solutions

How to fix P0068?

To fix the P0068 fault code, which indicates a MAP/MAF - Throttle Position Correlation issue, follow these steps:

  1. Inspect the vacuum lines and hoses connected to the MAP (Manifold Absolute Pressure) sensor, MAF (Mass Air Flow) sensor, and throttle position sensor (TPS). Look for any signs of damage, leaks, or disconnected lines. Replace or reconnect as necessary.

  2. Check the electrical connectors and wiring of the MAP sensor, MAF sensor, and TPS. Ensure they are properly connected, undamaged, and free from corrosion. Repair or replace any faulty wiring or connectors.

  3. Clean the MAP sensor, MAF sensor, and throttle body with a sensor-safe cleaner. Use a soft brush or cloth to remove any debris or buildup that may impede their proper function.

  4. Inspect the intake manifold for any signs of leaks or cracks. Fix any leaks or replace the intake manifold if necessary.

  5. Check the throttle body for proper operation. Ensure it opens and closes smoothly without any binding or sticking. Clean or replace the throttle body if needed.

  6. Use a diagnostic tool to reset the fault code and clear any stored codes from the vehicle's computer. Take the vehicle for a test drive to see if the P0068 fault code returns.

If the above steps do not resolve the issue, it is recommended to consult a professional mechanic or authorized service center for further diagnosis and repair.