P0068 OBD-II: MAP/MAF - Throttle Position Correlation
P0068 Severity
Should you fix P0068 yourself?
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
What causes OBD-II fault code P0068?
The Manifold Absolute Pressure (MAP) Sensor tells the engine control module (PCM) how much pressure is in the engine manifold. The Mass Airflow Sensor (MAF) tells the PCM how much air is actually flowing through the engine. The Throttle Position Sensor (TPS) tells the PCM the position of the throttle plate. The PCM compares the Throttle Position Sensor reading to the MAF or MAP Sensor readings to validate the information from both the TPS sensor and the MAF or MAP Sensor. If the PCM determines that one or more of the sensors is reading incorrectly, it will set code P0068.
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What Does P0068 Code Mean?
OBD-II Code P0068 is defined as a MAP/MAF - Throttle Position Correlation
The Manifold Absolute Pressure (MAP) Sensor tells the engine control module (PCM) how much pressure is in the engine manifold. The Mass Airflow Sensor (MAF) tells the PCM how much air is actually flowing through the engine. The Throttle Position Sensor (TPS) tells the PCM the position of the throttle plate. The PCM compares the Throttle Position Sensor reading to the MAF or MAP Sensor readings to validate the information from both the TPS sensor and the MAF or MAP Sensor. If the PCM determines that one or more of the sensors is reading incorrectly, it will set code P0068.
P0068 Symptoms
- Decreased engine performance
- Increased fuel consumption
Common Problems That Trigger the P0068 Code
- Manifold Absolute Pressure (MAP) sensor failure
- Mass Air Flow (MAF) sensor failure
- Powertrain Control Module (PCM) failure
- Throttle Position Sensor (TPS) failure
- Vacuum leak
- Wiring issue
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