Code Definition

P0068 — MAP/MAF Throttle Position Correlation

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0068

P0068 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0068 is stored, the module has detected a correlation fault — two sensors that should track each other have diverged beyond tolerance.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0068 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0068 code indicates a discrepancy between the Manifold Absolute Pressure (MAP), Mass Air Flow (MAF) sensor readings, and the Throttle Position Sensor (TPS) signal. This code is set when the Engine Control Module (ECM) detects that the input from the MAP or MAF sensor doesn't correlate appropriately with the throttle position, suggesting an issue with air intake or airflow measurement. Proper correlation between these sensors is crucial for efficient engine operation, as it affects air/fuel mixture and engine performance.

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